What Your Character Knows

When your character attempts to recall information during play, your GM will call for an ability check. The difficulty reflects how specialized or obscure the knowledge is. This chapter tells you what your character actually knows at each level of that check.

How to use this chapter: Each category has three layers. The first layer is always visible: read it now, before the campaign, as baseline knowledge your character carries without effort. The collapsible sections below it open when you succeed on the listed check at the table.

Read the open text for every category before Session 1. It is not secret: it is what your character simply knows. The collapsed sections represent what you might recall under pressure, given training or experience in that area.

What changes at each tier: DC 13 gives you facts: the kind of thing a trained professional knows. DC 15 gives you implications: what those facts mean, what questions they raise, what a thoughtful person does with them. DC 17 gives you dangerous knowledge: what someone equipped with this information could do with it, and why most people are not told. These are three different kinds of knowing, not just three amounts of the same thing.

The collapsible sections below are arranged by check difficulty. Click to expand each tier.

Roman Military Lore

Ability check: Intelligence (History)

The Roman legion is the most effective military force in the world and you are part of it. You know this not from pride but from the daily experience of what the machine around you can do. You know the chain of command by reflex, the fort layout by muscle memory, and the names of the major Germanic defeats by the way veterans go quiet when someone brings them up. Three things every soldier knows without being taught: the Teutoburg Forest cost Rome three legions and the Emperor’s sleep for the rest of his life; the Marcomanni have been pressing the Danube since before you enlisted; and the aquila – the legion’s eagle standard – is never, under any circumstances, surrendered.

What you know without a check:

History proficiency: The three retired legion numbers (XVII, XVIII, XIX) and why they were never reused; the watchtower fire-signal code for your sector of the frontier.
Athletics proficiency: Formation timing by instinct – you know when the line is about to break before it breaks; you can read a march’s pace and know how many miles remain before the unit’s legs give out.
Strength 14 or higher: The weight of a full kit and how it distributes across the body after six hours; you can read a soldier’s conditioning from across a courtyard by the way he moves under load.

DC 13 — What any soldier knows

The Roman legion is organized in cohorts of roughly 480 men, divided into six centuries of 80 each. A century is commanded by a centurion; the first cohort of a legion is double-strength and contains its most experienced soldiers.

The chain of command runs: legionary (miles) to optio (centurion’s second) to centurion to tribune to legate. The legate commands the entire legion and reports to the governor of the province, who reports to the Emperor.

The Germanic frontier has been active for most of the last two centuries. The disaster at Teutoburg Forest (9 AD) cost Rome three entire legions under Publius Quinctilius Varus. The Rhine and Danube rivers form the primary defensive line. The Limes Germanicus is the fortified road and watchtower system that supplements the rivers.

Current Emperor Marcus Aurelius has been personally campaigning on the Danube frontier for several years. The Marcomanni and Quadi tribes have pressed the Danube line hard. The situation is serious but not desperate, at least from the official dispatches.

Standard legion pay: around 300 denarii per year for a legionary, paid in three installments and subject to deductions for food, equipment, and burial fund.

DC 15 — What a veteran, optio, or officer knows

The three legions lost at Teutoburg were XVII, XVIII, and XIX. Their numbers were retired permanently. Rome does not reuse the numbers of legions destroyed by barbarians.

The current frontier legions on the Danube include Legio XIV Gemina Martia Victrix, which has a distinguished history going back to the Boudicca suppression in Britain. Knowing which legions are stationed where, and their reputations, is useful information for political navigation at higher levels of military society.

The Marcomanni are Germanic, but they have significant trading relationships with Rome and are partly Romanized in their material culture. Their king, Ballomar, led a major incursion into Italy itself as recently as 170 AD — the first barbarian army to enter Italy in centuries, which caused considerable panic in Rome. The current campaign is partly about re-establishing the boundary after that incursion.

The foederati system: Rome pays certain Germanic tribes to fight as allies rather than enemies. These auxiliary troops are valuable and not entirely trustworthy. A soldier who understands this can navigate relations with allied tribes more effectively.

Siege logistics: a standard Roman siege of a fortified position required approximately one month of preparation for a serious fortification, assuming adequate supply lines. The party is not running a siege, but knowing the timescale changes how you think about strategic options.

DC 17 — What a senior officer, military scholar, or staff veteran knows

Arminius was one of us. That is the thing they do not put in the formal accounts of Teutoburg. He was a Roman-trained auxiliary, a man who ate at Roman tables, who knew the formations from the inside. The disaster was not a military failure in the field. It was an intelligence failure: Rome trusted a man it had made capable of destroying it. The lesson drawn was “never fully trust auxiliary leaders with tactical knowledge.” The lesson not drawn was “the man most dangerous to us is the man we trained.”

What this means now: Vercingetorix has been watching this fort for months. He knows its patrol schedule. He knows its weak points. He has not been educated by Rome, but he has been watching. The Teutoburg framework applies.

The second strategic goal of the Emperor’s current campaign is not public: Marcus Aurelius wants to push the frontier north and create new provinces beyond the Danube. The Senate’s opposition to this, led by Brutus’s faction, is not simply conservative politics. It is a genuine strategic argument about whether Rome is overextended. Both sides are partially right. The party is living in the specific location where this argument has consequences.

Germanic tribes have learned to use Roman formation rigidity as a weapon. Lure the legions into broken ground or forest where the acies triplex cannot function. The forest beyond this fort is Germanic territory for a reason.

Roman Religion

Ability check: Intelligence (History) or Wisdom (Insight)

The gods are real and they are paying attention. You have known this since childhood. Roman religion is not primarily about belief; it is about maintenance. The relationship between mortals and gods is do ut des: I give so that you give. You make offerings, keep your vows, observe the correct festivals, and in return the gods hold up their end. When you sacrifice at the camp altar each morning, you are not performing a ritual for comfort; you are doing the practical work of keeping divine favor active. The Capitoline Triad – Jupiter, Juno, and Minerva – are the official gods of Rome. Mars is the god your unit actually prays to before combat. You never swear a false oath to Jupiter. The last soldier who did that in front of witnesses was found dead the following morning, and not one person in the century was surprised.

What you know without a check:

Religion proficiency: All twelve major gods by name and specific jurisdiction; which festivals require active observance versus passive acknowledgment; what constitutes a valid vow and what breaks one.
Wisdom 14 or higher: You have noticed when the gods are paying attention. You know the difference between a bad omen and ambient misfortune. The feeling is physical: a change in pressure, a wrongness in the air. You may not be able to explain it but you have never been wrong when you have felt it.

DC 13 — What any Roman knows

The twelve major gods of the Roman pantheon correspond roughly to the Greek Olympians: Jupiter (king of the gods, sky and thunder), Juno (queen, marriage and women), Mars (war), Venus (love and beauty), Mercury (messengers, travel, trade), Diana (hunting, moon), Apollo (sun, prophecy, music, healing), Minerva (wisdom and crafts), Neptune (sea), Vulcan (forge and fire), Ceres (grain and harvest), Bacchus (wine and revelry).

Additionally: Pluto governs the Underworld; Janus governs beginnings and doorways; Vesta governs the hearth and the sacred flame. The Vestal Virgins maintain the flame in Rome; if it goes out, it is considered a very bad omen.

Religious practice is primarily about maintaining good relations with the gods: do ut des, “I give so that you give.” Offerings, prayers, and vows create and maintain divine relationships. Public religion (state sacrifices, temple festivals) is conducted by priests and magistrates. Private religion is conducted by the head of the household at the family shrine.

The pontifex maximus, the chief priest of Rome, is currently the Emperor himself. This is not unusual; emperors have held the title since Augustus.

Augury is the practice of reading divine will through signs: the flight patterns of birds, the appearance of sacrificial entrails, lightning, unusual events. The official augurs are a priestly college in Rome. In the field, the haruspex (reader of entrails) accompanies major military operations.

DC 15 — What an educated Roman or minor religious practitioner knows

The Mithras cult (the Mysterium Mithrae) is widespread among soldiers and has been for about a century. It involves initiation rites, seven grades of membership, communal meals, and the central myth of Mithras slaying the primordial bull. It is exclusively male and particularly popular in the military because of its emphasis on brotherhood, courage, and the ordered cosmos. A Mithraeum (temple) can be found in most significant Roman military installations.

The difference between sacra publica (public rites, state religion, conducted on behalf of Rome) and sacra privata (private rites, conducted by individuals and families): both are religiously legitimate but socially different. Magic (magia) occupies a grey zone: some forms are tolerated; others are prosecuted. Love spells and curse tablets (defixiones) are common but officially frowned upon; spells against the Emperor or the state are capital offenses.

The Lemuria festival runs on May 9, 11, and 13 (odd days only). The head of household performs the black-bean ritual to appease lemures. During this period, temples are closed, marriages are avoided, and the general assumption is that the boundary between living and dead is thinner.

The Parentalia (February 13–21) honors the manes, the ancestral dead, with offerings at their tombs. The Feralia on February 21 is the public version. A Roman soldier far from home is supposed to observe these days even in the field; most soldiers do maintain some form of private ancestral observance.

DC 17 — What a priest, augur, or religious scholar knows

There is a ritual called devotio still in the priestly records. A Roman commander consecrates himself and the enemy army to the infernal gods, then charges into the enemy alone, drawing their destruction down on both sides. It was last performed in the Samnite Wars. It has not been performed since because it requires both absolute certainty and absolute willingness to die. A character who understands this knows it remains available. They also know that if someone performs it and survives, something has gone wrong with the ritual, and the infernal gods will notice.

The Sibylline Books are held in Rome and consulted in specific crises. They have been consulted three times in living memory. Each time, the prescribed remedy involved Greek-style religious rites rather than Roman ones. Make of that what you will. There is a faction among Roman theologians that believes Roman religion borrowed its crisis tools from Greece because the Greek crisis tools work and the original Roman ones did not survive intact. Nobody says this out loud.

Technical augury: the ex tripudiis method (sacred chickens presented with grain before military action) is widely known. What is less known is why it works: the chickens are kept hungry enough that refusing to eat requires significant restraint. A chicken that will not eat when it is hungry is, in some meaningful sense, listening to something other than its hunger. The story of the general who threw the chickens overboard and then lost the battle catastrophically is the reason frontier soldiers take this seriously. He had decided the ritual was theater. The ritual did not share his opinion.

Mars: Campaign-Specific Knowledge

Ability check: Intelligence (Religion)

You are a soldier serving on the Germanic frontier in the month of April. Mars is your patron god in the most literal professional sense. His month is March; his festival, the Quinquatria, was five weeks ago; your weapons were blessed in his name at the last Armilustrium. You do not worship Mars the way a civilian worships their household gods – you serve under him the way you serve under a commanding officer. He is present in the impact of a pilum, in the discipline of formation, in the specific relief of still being alive after a hard day. The frontier soldiers who dismiss religion still observe the Quinquatria. They would not explain why. They simply do.

What you know without a check:

Religion proficiency: The exact words of the Quinquatria weapon blessing; the correct form of address when speaking to Mars before combat; the difference between Mars Gradivus (the marching god, god of disciplined war) and Mars Ultor (the avenger, the punitive aspect).
Soldier background: What Mars’s favor feels like inside a formation. You have fought in his name enough times to recognize when the ground changes under your feet; when the air thickens before a charge; when you know with certainty that the line will hold. Whether this is divine favor or battle-calm, you do not analyze it. You use it.

DC 13 — What any Roman soldier knows

Mars is the Roman god of war and one of the three most important gods of the state, alongside Jupiter and Quirinus (the deified Romulus). He is the father of Romulus, the founder of Rome, which gives him a particular relationship with the Roman people that no other war god has.

His symbols: the spear, the wolf, the woodpecker. His sacred month is March (Martius). The Campus Martius in Rome (the Field of Mars) is where military exercises and political assemblies were traditionally held.

He responds to excellence in battle, not to random violence. A soldier who fights with discipline and skill honors Mars. A soldier who slaughters the defenseless does not. Mars is a god of war, not a god of massacre.

His sacred animals: the wolf (he sent a she-wolf to nurse Romulus and Remus) and the woodpecker (picus), which was considered a protective bird of the forest.

DC 15 — What a senior soldier, military priest, or devotee of Mars knows

Mars has two aspects that practitioners distinguish: Mars Gradivus (Mars the marcher, the war-leader, the god of the legions advancing in disciplined formation) and Mars Ultor (Mars the Avenger, the punitive aspect, the god of righteous vengeance for wrongs done). His temple on the Capitoline was to Mars Ultor, built by Augustus to honor his vengeance for the assassination of Julius Caesar.

The Salii, the dancing priests of Mars, perform elaborate rituals in March involving the sacred shields (ancilia). One of these shields is said to have fallen from heaven as a gift from the gods; the others are copies made to protect the original from identification and theft. They are kept in the Temple of Mars.

Mars is closely associated with the founding of Rome and with the protection of Roman civilization against external threats. His anger is not arbitrary; it is specifically directed at threats to Roman order, Roman excellence, and Roman boundaries. When Roman soldiers fail to meet the standard he expects, he withdraws his protection. When they exceed it, his favor is tangible.

His relationship with Venus is complicated: they are lovers, which creates a divine intersection between war and beauty, between destruction and creation. This is not accidental in Roman theology; the two forces are understood as complementary.

DC 17 — What a high priest, religious scholar, or initiated devotee knows

There is a spear kept in the Regia in Rome – the old royal house near the Forum, now the pontifex maximus’s administrative office. It is one of several pignora imperii, the sacred objects whose possession by Rome is considered bound to Rome’s survival. The full list is not public: the shields of the Salii, the Palladium, the spear, and several others whose names are not written down. If one of these objects were corrupted or lost, the theological implications are serious enough that no one in the priestly college discusses them directly.

The spear you are looking at right now is not the one in Rome. What that means about this one – who made it, what it was for, what it is owed – is exactly the question you do not yet have the information to answer.

In older Roman religion, before the Republic, Mars protected fields as well as armies. The ambarvalia (the processional rite where farmers walked their field boundaries invoking Mars) survives as a trace of this. The older Mars did not distinguish between the violence of war and the violence of agriculture: clearing land, protecting borders, driving off disease. The frontier version of Mars, the one soldiers pray to out here where civilization ends, is closer to the original than the civic version in Rome. Out here, he is not a concept. He is a presence on the tree line.

Germanic Tribes

Ability check: Intelligence (History) or Wisdom (Insight)

You are stationed on the Germanic frontier. You have opinions about the people on the other side of the palisade. Most of your opinions are wrong in ways that are useful to know. The Romans who die soonest on the frontier are the ones who assumed the Germans were just Romans without roads. They are not. They have their own logic, their own honor system, their own relationship with their gods – and some of them know more about your fort’s patrol schedule than your centurion does. The Teutoburg Forest disaster (9 AD, 160 years ago) cost Rome three legions. Soldiers still tell the story. The lesson is not that Germans are terrifying; the lesson is that a Roman who stops paying attention is already dead.

What you know without a check:

Survival proficiency: You can identify Germanic camp sign from Roman sign at 100 yards by smell and sound; you know which forest sounds are wrong (too quiet, the wrong birds, the specific silence before an ambush); you know which months raids increase and which months the forest goes quiet.
Insight proficiency: You read Germanic emotional register. You know the difference between a warrior who is afraid and one who is ready. You know what it looks like when a chief’s authority over his men is slipping. You have been lied to by Germanics before and you know what that looks like too.

DC 13 — What any frontier soldier knows

The Germanic peoples beyond the Rhine and Danube are not a unified nation. They are dozens of separate tribes with different leaders, different customs, and sometimes actively hostile relationships with each other. Treating “the Germans” as a single entity is a mistake that has cost Roman soldiers their lives.

The major tribal groupings the frontier soldier knows: the Marcomanni and Quadi (Danube frontier, the current main threat), the Cherusci (Rhine frontier, historically dangerous; Arminius was Cherusci), the Suebi (a broad grouping including many smaller tribes), and various coastal tribes of the far north.

Germanic warriors fight differently from Roman legionaries. They favor shock, speed, and ferocity over sustained formation combat. They are not disciplined in the Roman sense; their power comes from individual excellence (virtus exists in German culture, though called by different names) and the bonds of the war-band (comitatus). They fight best in forest, ambush, broken ground. They struggle against disciplined infantry in open formation.

Germanic chiefs command loyalty through demonstrated personal excellence and through gift-giving. A chief who cannot give gifts loses followers. Raiding Roman territory is partly about demonstrating that the chief can provide.

DC 15 — What a scout, translator, or veteran of multiple frontier postings knows

The comitatus is the Germanic war-band structure: a chief surrounded by warrior companions who have personally sworn loyalty to him. The bond is personal and mutual; the chief owes the companions equipment, food, and share of plunder; the companions owe him their lives. A companion who outlives his chief in battle has failed fundamentally; this is not abstract shame but concrete social destruction.

This means that killing the chief in battle is often more decisive than killing half his warriors. The warriors of the comitatus may scatter or even switch sides after a chief’s death, because their oath was personal, not institutional.

The Thing is the Germanic assembly where free men gather to make decisions, resolve disputes through law-speaking, and witness oaths. It has real authority; even a powerful chief cannot simply override a Thing’s decision without losing face and followers. This is the closest thing Germanic society has to republican governance.

Wergild (blood price): Germanic law resolves most inter-personal violence through payment rather than punishment. Every free person has a wergild value; if you kill them, you pay their family that value or the family has the right to feud. A Roman soldier who understands this can resolve a killing that might otherwise escalate into a cycle of violence.

Germanic religious sites are primarily natural: sacred groves, specific rivers, notable trees, bogs. The bog is particularly significant; offerings (including human sacrifices in specific circumstances) are made there. A Roman entering a sacred site without acknowledgment is committing an offense that the tribe will notice.

DC 17 — What a scholar of Germanic cultures, a senior translator, or a long-term frontier negotiator knows

Germanic warriors seek battle-death on purpose. This is not nihilism. In their cosmology, warriors who die in battle go to the hall of the war-god; those who die otherwise go to a grey realm. They are not being reckless when they charge without regard for their lives. They are making a theological choice. A Roman officer who understands this knows that you cannot make Germanic warriors afraid of dying. You can only make them respect you, or give up on converting them into a position of defeat that does not honor the choice they have made.

Tacitus wrote a detailed account of the Germanic peoples roughly a century ago. It is biased: he used the Germans as a mirror to criticize Roman decadence, which means he idealized things he found convenient to idealize. It is still useful, because the parts he was not using rhetorically tend to be accurate.

The woman you are looking for – the volva, the staff-carrier – exists outside normal social categories in ways Rome does not have a clean equivalent for. She is not a priestess. She is not a wife or a slave. She travels, she performs ritual, she gives judgments that war-leaders cannot contradict publicly without losing followers. The war-god learned her art from the goddess of the dead, in the Germanic tradition: this is considered a source of both power and cost for both of them. A Roman who treats her as a curiosity has misread the room completely. Treat her as you would treat a senior augur with the backing of an army she does not show you.

Germanic runes are not decoration. Carving a rune correctly is also an act of invocation. Whether this is literally true is something you will have your own view on by the end of this campaign.

The Frontier

Ability check: Intelligence (History) or Wisdom (Survival)

The frontier is not where Rome ends. It is where you are. You know the Limes the way you know the calluses on your palms: in exhaustive, functional detail. You know which watchtower has the loose bottom step, which section of road floods in spring, which stretch of forest smells different because the trees are wrong – too dense, too dark, no birdsong. The traders who cross legally bring grain, amber, furs, and information. The ones who cross without authorization bring problems. A soldier who crosses without orders brings a court martial and, if he is unlucky, a cross. The line between here and there is not philosophical. It is a ditch, a palisade, and a watchfire, and everything beyond it is actively trying to read your patrol schedule.

What you know without a check:

Survival proficiency: The monthly pattern of raid activity in your sector; how to read your sector’s fire-signal system without thinking about it; what a ford looks like at 400 yards in low visibility; the tree-line anomalies that precede an ambush at three of the most common approach points.
Perception proficiency: You notice what does not belong. A track that goes in without coming out. A tree blazed in a pattern that is not Roman military marking. Smoke from the wrong direction. You cannot always say what it means but you always notice it.

DC 13 — What any soldier posted to the frontier knows

The Rhine and Danube rivers form the primary Roman defensive line in northern Europe. The Limes Germanicus supplements this with a system of roads, watchtowers, and fortified posts that parallels the rivers through territory that is not always defensible from the rivers alone.

The territory beyond the frontier is called Germania Magna (Greater Germania) and is not under Roman control, though traders cross regularly and Rome has significant intelligence about conditions there. The forests are denser than anything in the Romanized world; Roman military doctrine has never worked well in them.

The fortified watchtowers (burgi) signal by fire: one fire for all clear, two for alert, patterns for specific threat types. Every soldier on the frontier knows the basic signal code for their sector. Communication between posts takes approximately one hour per twelve miles under good conditions.

Germanic raids on the Roman side of the frontier happen regularly. They are not always full military operations; often they are cattle raids, opportunistic looting, or demonstrations of a chief’s power. The Roman response is supposed to be fast, proportionate, and visible. A response that is too slow encourages more raids; a response that is disproportionate inflames the tribes and can trigger larger conflicts.

DC 15 — What a scout, experienced frontier soldier, or intelligence officer knows

The Germanic forest is genuinely different from Roman-managed woodland. Old-growth forest in the Hercynian region (the great forest of central Europe) is dark at midday, has almost no undergrowth in places (the canopy is too dense), and supports wildlife that has not learned to fear humans because humans rarely enter. Navigation is by landmark and sun when visible, not by track.

The frontier trading posts (vici) that grow up outside Roman forts are sources of intelligence as well as commerce. Germanic traders bring information about conditions across the frontier, often without intending to. A soldier who knows how to listen to market gossip, who knows what goods moving in what direction indicate about internal tribal politics, has a significant information advantage.

River crossings are the most vulnerable point of any frontier operation in both directions. The Rhine and Danube are broad and cold; unassisted crossing takes time and leaves troops exposed. Germanic forces know this and frequently target crossing operations. The position of known fords is strategic information.

Seasonal patterns of Germanic activity: raids are most common in summer (better weather, easier movement) and sometimes in early winter (before the deep freeze, while food stores can still be taken). Deep winter on the frontier is quiet. Spring is when movements begin again; the period of maximum uncertainty.

DC 17 — What a frontier administrator, senior intelligence officer, or longtime frontier governor knows

The frumentarii are officially grain-supply officers. They are not grain-supply officers. They are the closest thing Rome has to a secret service, and they maintain informants on both sides of this frontier. If you know how to signal the network, you can sometimes access information that would not otherwise be available. If you do not know how to signal it, you might walk past an informant three times a week without knowing it.

The long-term strategic picture that nobody says plainly in official dispatches: the Germanic population is growing and the Roman frontier population is not. This has been in the internal reports for two generations. Marcus Aurelius’s plan to push the frontier north is one proposed answer. Brutus’s faction in the Senate has a different proposed answer: accept a shorter frontier and defend it more tightly. Both positions are responses to the same underlying fact. You are standing in the location where that political argument has physical consequences.

Rome manages Germanic internal politics actively: subsidizing friendly chiefs, undermining hostile ones, controlling trade access as leverage. A chief who raids Rome loses trading relationships; a chief who cooperates gains status gifts that make him powerful without him fully controlling where his power comes from. This mechanism works both ways. A character who understands it can move within it – including finding the specific chiefs around this fort who are being subsidized by someone whose interests are not Rome’s.

Roman Law and Politics

Ability check: Intelligence (History)

You know less about the Senate than you think you do, and more than a civilian would. You know that the Emperor holds his power through the army, the Senate, and the grace of the gods, roughly in that order. You know that a Triumph is real – you may have witnessed one – and that the right to hold one is a formal declaration tied to specific military achievements, not an automatic grant. You know what treason means in practical terms: you said something wrong in front of someone who remembered it. The law exists, it is real, and it applies to soldiers as well as senators. What you do not know, and should not pretend to know, is what goes on inside the Curia on any given afternoon. The Senate is not your world. It affects your world. That is a meaningful distinction.

What you know without a check:

History proficiency: The current consuls by name (Lucius Fulvius Rufus and Marcus Plautius Quintillus, in the year of the campaign); what damnatio memoriae is and the last major figure it was applied to; the basic structure of a senatorial trial.
Noble background: The Senate’s current principal factions and their positions on the frontier war; Senator Brutus’s public reputation as a conservative reformer and his documented opposition to the Emperor’s Danube expansion policy; which senatorial families have frontier interests and which consider it an expensive distraction.

DC 13 — What any Roman citizen or educated provincial knows

Rome is governed by the Emperor, the Senate, and a complex of magistracies (consul, praetor, quaestor, aedile, tribune of the plebs). In practical terms, the Emperor holds supreme executive, military, and increasingly judicial authority; the Senate retains significant prestige and some legislative function; the magistracies still operate but largely within the Emperor’s framework.

The Senate consists of approximately 600 men of senatorial rank. Membership is hereditary but can be granted or removed. Senators are supposed to be wealthy landowners from Italy, though in practice the Senate has been opened to provincial elites over the centuries. A senator from Africa or Spain is not unusual.

The Emperor in 175 AD is Marcus Aurelius Antoninus Augustus, now in his early fifties. He is known as a Stoic philosopher and has published personal reflections (the Meditations) that circulate among educated Romans. He is generally respected, sometimes idealized, and has been on campaign for most of the last decade. His co-emperor Lucius Verus died in 169 AD.

Treason (perduellio or maiestas) is the most serious political crime. The charge can cover a wide range of offenses: actual conspiracy against the Emperor, public defamation of the Emperor, failure to prosecute a known traitor. Conviction generally meant death and forfeiture of all property. Accusers were sometimes rewarded from the convicted person’s estate, which created obvious incentives for false accusation.

DC 15 — What a soldier with Senate connections, an educated officer, or a politically aware civilian knows

A Triumph is the highest military honor Rome can grant: a formal procession through Rome in which the victorious general, dressed as Jupiter, rides in a chariot from the Capitoline Hill through the Forum. The Senate must grant permission for a Triumph; the conditions include a significant foreign victory and a minimum number of enemy killed. The Emperor is currently due a Triumph for his Danube victories; the date and processional route have been announced.

The Senate’s factions in 175 AD: broadly, there are those who support the Emperor’s expansive frontier policy (more provinces, more glory, more territory) and those who oppose it (overextension, expense, distraction from internal problems). Brutus’s faction is the latter: they want a negotiated boundary, reduced military spending, and restored senatorial authority. This is not an irrational position; it has serious historical and financial arguments behind it.

The Praetorian Guard: the Emperor’s personal bodyguard, stationed in Rome and commanded by Praetorian Prefects. They are better paid than legionary soldiers and considerably better connected politically. Historically, they have been kingmakers in moments of political crisis. In 175 AD they are loyal to Marcus Aurelius, but their loyalty is institutional, not personal; they would transfer it smoothly to a successor.

Legal procedure for treason charges: accusation, formal arrest, Senate trial (for senators), or imperial court (for others). The accused has the right to speak in their defense. Evidence matters. Witnesses matter. A well-organized case with credible witnesses and documentary evidence is significantly more likely to succeed than a bare accusation.

DC 17 — What a legal expert, senior senator, or person with direct Senate experience knows

Damnatio memoriae – condemnation of memory. The Senate can vote to erase a convicted traitor from the record. Statues come down. Names are chiseled off inscriptions. The name is not spoken at public occasions. It has happened to emperors. It can happen to a senator. For someone like Brutus, who is in the business of being remembered, who has spent his career constructing a legacy worth inheriting – this is a worse outcome than death. He knows this. It is the one thing that might reach him when nothing else does.

The mechanism for bringing a senator down through Roman law is available but requires specific pieces: evidence presentable in a formal proceeding, at least one credible witness willing to testify publicly, and access to either the Senate itself or the Emperor’s direct judicial authority. A Praetorian arrest without prior senatorial consent is constitutionally irregular and creates political risk for whoever orders it. This is not impossible; it is just complicated enough that Brutus has calculated nobody will attempt it while he controls the narrative.

If the party reaches Session 5 with evidence, a witness, and some form of imperial access – they have a path that does not require killing him. Whether they want to take it is a different question.

Poisons, Medicine, and Field Healing

Ability check: Intelligence (Nature) or Wisdom (Medicine)

You have watched the medicus work. If you have served long enough, you have held someone still while he worked. You know what a wound going bad looks like – the smell is the first sign, before the discoloration and before the fever – and you know that the difference between a man who survives a stomach wound and one who does not is partly luck and partly how fast the medicus gets there. Soldiers share practical knowledge: yarrow stops bleeding, willow bark reduces fever, the white mushrooms by the creek are fine and the red ones will kill you by morning. None of this is medicine. It is the minimum. Actual medicine is what the medicus does, and you watch him do it and you remember, because on a bad day you may need to do it yourself.

What you know without a check:

Medicine proficiency: Wound fever signs before they become obvious to non-specialists (the smell change, the specific quality of elevated skin temperature, the eye response); the field hospital triage hierarchy (dying vs. treatable vs. walking wounded) and what each category actually means in resource allocation terms.
Herbalist’s Kit proficiency: Yarrow, willow bark, and hemlock by sight, smell, and texture in the field; the difference between a foraging kit assembled for cooking and a kit assembled for medical or other purposes; which plants in this region are dangerous regardless of quantity.

DC 13 — What any soldier who has served near a field hospital knows

The Roman military maintains a valetudinarium (field hospital) at any permanent installation. The standard approach to wounds: clean the wound with wine or vinegar (which reduces infection without anyone understanding why), remove foreign material, bandage firmly. Cauterization for wounds that will not stop bleeding. Amputation for limbs that cannot be saved.

Common field medicines: theriac (a compound antidote used for general poisoning, snake bites, and as a general protective), willow bark preparation (reduces fever), honey as wound dressing (antiseptic properties), and various herbal preparations depending on what is available locally.

Soldiers know the practical signs of a wound going wrong: fever, swelling beyond the immediate wound, red streaks moving from the wound site, the particular smell that means the flesh is dying. Any soldier who has seen enough field medicine can recognize these signs, even without knowing the underlying cause.

Poisoning signs that a soldier might recognize: sudden collapse after eating or drinking, convulsions, skin color changes (pale, blue, flushed), excessive salivation, loss of consciousness. The soldier’s instinct is to check whether others who ate the same food are affected.

DC 15 — What a medical orderly, medicus, or person with significant medical training knows

Specific plant-based medicines available in the Germanic frontier region: yarrow (Achillea millefolium, named for Achilles who used it to treat wounded soldiers) for wound healing; opium (poppy preparation) for severe pain management; hemlock in careful doses as a muscle relaxant; belladonna in very careful doses for pain; henbane for sedation during surgical procedures.

The line between medicine and poison is quantity. Hemlock that treats muscle spasm in small doses kills in large ones. Belladonna that reduces pain in small doses causes delirium and death in larger ones. A trained medicus knows the thresholds. An untrained person making preparations from the same plants is likely to miscalculate.

Poison identification: the smell and appearance of certain preparations. Hemlock has a distinctive mousy smell. Aconite (wolfsbane, highly toxic) leaves a tingling sensation in small amounts that a taster might notice. Lead acetate (sweet, used as a sweetener in Roman cooking, gradually accumulates to toxic levels) has no obvious immediate effects.

The Roman practice of food-tasting: wealthy and powerful Romans employed tasters not out of paranoia but as sensible precaution given that poisoning was a real political tool. The praegustator ate a portion of every dish before the patron ate. This protected against fast-acting poisons; it did nothing against slow accumulation.

DC 17 — What a specialist physician, apothecary, or someone trained in poison as a craft knows

Aconitum (wolfsbane) was the preferred assassination tool in Rome for a generation after the Julio-Claudian period. It was popular for a specific reason: it can be introduced into wine without affecting the taste, symptoms begin 30 minutes to two hours after ingestion, and it leaves minimal trace. Tingling in the mouth, then difficulty swallowing, then cardiac arrest. By the time a medicus examines the body, it looks like a bad heart. The reason it fell out of fashion is that it became better known among physicians. A medicus who has seen one case can now identify the next one.

Cicuta (hemlock) is slower and more available, but the visible convulsions make the cause obvious to anyone who has seen it before. It is the poison of someone who is willing to be caught, or who does not know better.

The law that governs this: the Lex Cornelia de sicariis et veneficis. Possessing poison preparation without a medical context is a capital offense. Roman law distinguishes venena bona (medicines in therapeutic doses) from venena mala (the same substances used against a person). The distinction is the intent, not the substance. A character carrying wolfsbane without Valeria’s authorization is, in legal terms, carrying evidence of attempted murder. Keep this in mind.

Reading Divine Signs

Ability check: Wisdom (Insight) or Intelligence (Religion)

Every Roman soldier watches three things without being taught to: where lightning falls relative to the camp, which direction the wolf ran when it crossed your path, and whether the sacred fire at the altar was burning or out at first light. These are not superstitions. They are data points. The gods communicate through the physical world, and they always have. The question is whether you are paying attention. A crow on your left when you leave the gate is not nothing. Whether it matters depends on what you are about to do and how seriously you take the relationship. Most soldiers pay enough attention to notice, then make a judgment call. The ones who ignore the signs entirely tend to become cautionary examples.

What you know without a check:

Religion proficiency: The augury bird system by reflex (right is favorable, left is not; eagles favorable, owls ambiguous, ravens unfavorable; wolf direction relative to the camp); the three basic categories of haruspicina that any observer picks up from watching enough sacrifices.
Wisdom 14 or higher: You notice sign-patterns that others let pass as coincidence. You know when a day feels wrong before anything has happened – a quality of light, a stillness, the behavior of animals. You have learned to pay attention to this. You have not always been right but you have been right often enough.

DC 13 — What any Roman who takes religion seriously knows

Omens are communications from the divine world about the likely direction of events. They do not compel outcomes; they advise on them. A good omen before a battle increases the probability of success; it does not guarantee it. A bad omen advises against an action; it is still possible to proceed, but the Romans understood proceeding against clear divine advice as a form of arrogance that invited disaster.

Categories of omen: auspicia (bird signs, the most traditional), signa ex diis (direct divine signs: thunder, lightning, unusual astronomical events), prodigia (prodigies: unusual events that indicate something is wrong with the divine order, such as an animal birth defect, a statue sweating, or a spring running dry unexpectedly).

Eagle: Roman sacred bird, generally favorable, especially moving to the right (the favorable side). An eagle circling over a position is taken as a sign of Jupiter’s attention. An eagle landing is significant.

Owl: ambiguous. Associated with Minerva (favorable in some contexts) but also with death. An owl calling in daylight is considered a bad omen.

Raven: generally unfavorable in Roman tradition. Associated with death and the underworld.

Wolf: associated with Mars. A wolf appearing near a military camp is taken as a sign of Mars’s attention; whether favorable or unfavorable depends on the wolf’s behavior and direction of travel.

Thunder on the left: traditionally unfavorable in Roman augury. Thunder on the right: favorable. This refers to the augur’s left and right as they face south.

DC 15 — What a trained augur’s assistant, a priest, or a person with serious religious study knows

The ex tripudiis method: sacred chickens kept for the purpose of military augury are presented with grain before any significant military action. If they eat eagerly, dropping grain from their beaks (the tripudium solistimum), the omen is favorable. If they refuse to eat, the omen is unfavorable. If they fly away from the cage, the omen is very unfavorable. The chickens are kept hungry enough to ensure motivation to eat under favorable divine conditions.

Interpretation of sacrificial entrails (haruspicina): the liver of a sacrificed animal is examined in detail. The liver was understood as the seat of blood and life, and therefore of divine communication. A liver missing its gallbladder is unfavorable. A liver with the gallbladder intact and full is favorable. A liver that is diseased, shrunken, or abnormally shaped in specific ways indicates specific categories of bad omen. Full haruspicina is a technical specialty requiring years of training; the basics are known to any soldier who has watched the process enough times.

Unusual celestial events: a comet (stella crinita, “hairy star”) is almost always considered unfavorable, typically indicating the death of a great person. An eclipse is extremely unfavorable and requires immediate expiation rites. The appearance of two suns or two moons (sometimes reported as atmospheric optical effects) is a serious prodigy requiring senatorial consultation.

DC 17 — What a practicing augur, a high priest, or someone initiated into the deeper aspects of Roman religious practice knows

Not all bad omens mean stop. This is the thing that separates a trained augur from a frightened soldier: the distinction between an omen that advises delay, an omen that advises abandonment, and an omen that advises changing your approach. An augur who says “bad sign, halt everything” for every unfavorable reading is useless and eventually dangerous. The signs are specific. The action proposed matters. Reading the two together is the work.

The templum – the consecrated observation space – matters for technical reasons: without it, the signs have no formal religious validity. In field conditions, perfect consecration is not always possible. A skilled reader makes informed assessments without it. What you lose is certainty; what you keep is information.

The monstrum category is worth knowing: an omen so severe that military operations must halt for full expiation. A statue of the standards weeping. A sacred fire going out spontaneously in calm air. The sacrifice failing in specific dramatic ways. If your fort has produced a sustained sequence of failed morning sacrifices – which is not common; Paterculus has seen it once in thirty years – you are in monstrum territory and there is a formal obligation attached. Whether the Legate chooses to honor that obligation is a political decision. The soldiers’ effectiveness depends partly on whether they believe the obligation is being honored.

The Antonine Plague

Ability check: Intelligence (Medicine) or Wisdom (Insight)

You have lived with the plague for a decade. Not personally – you are still alive – but it has been present. The Antonine Plague arrived from the east in 166 AD, carried back by Lucius Verus’s army after the Parthian campaign. It has moved through the empire in waves since then, and each wave strikes differently: different cities, different legions, different seasons. You know soldiers who died of it. You know centuries that were reduced to skeleton crews before replacements arrived. You do not know its cause – no one does – and you do not know whether the man coughing in the tent next to you has it or has a cold. That uncertainty is part of daily life on the frontier in 175 AD.

What you know without a check:

Medicine proficiency: The characteristic rash that distinguishes the plague from ordinary fever, which becomes visible by day three; the quarantine procedure your unit uses and why it works (separated quarters, burned clothing and bedding, separate water and food); the survivor’s social mark and what “plague-touched” means in your unit.
Constitution 14 or higher: You read collective health before symptoms appear. You know what a sick man looks like before he knows himself – the slight alteration in energy, the eyes, the way a century that has something moving through it sounds different at morning assembly. You have used this knowledge before.

DC 13 — What any soldier in the army knows

The plague arrived from the east ten years ago and has not left. It moves in waves: a bad season, then quiet, then another outbreak somewhere else. No one understands why it strikes some garrisons hard and passes others without significant casualties.

Recognizable symptoms: high fever for several days, thirst, diarrhea, inflamed throat, then pustules or a rash appearing on the skin. The rash distinguishes this disease from ordinary fever. Most soldiers who see the rash understand what it means.

Fatality rate: variable. In badly struck units, one soldier in four does not survive. In mild outbreaks, most recover in two to three weeks. Age and previous health seem to matter; soldiers who are already malnourished or wounded are more vulnerable.

“Plague-touched” as a social term: a soldier who survived the plague carries a visible survivor’s mark in some cases (scarring from the pustules) and an invisible social mark. Other soldiers are instinctively wary. This is not irrational; a survivor may be immune, or may still carry something. The social dynamics shift in a quarantined unit.

DC 15 — What a unit commander or medical orderly learns managing an outbreak

Army procedure when an outbreak is confirmed: the affected soldiers are separated from the healthy as quickly as possible. Their clothing and bedding are burned. Their food and water supply is replaced and not shared with the wider unit. Movement of the quarantined sub-unit is restricted. These procedures reduce spread significantly, though they were developed through observation rather than understanding of why they work.

Some units have been harder hit than others. The pattern suggests density (crowded barracks suffer more), water source (units sharing water with sick animals or downstream from affected settlements fare worse), and morale (units with low morale and poor nutrition appear more vulnerable). None of these connections are officially documented; they are observed by experienced commanders.

The administrative problem: a unit at 60% strength is not deployable for sustained operations. The army has responded with emergency recruitment, with accelerated promotion of survivors (who appear immune), and with creative reorganization of depleted units. A century of 50 men is not a century, but it functions if its centurion is competent.

The economic problem: the plague has reduced the agricultural labor force in affected provinces significantly, driving grain prices up and creating supply chain difficulties for the frontier legions. A soldier paying attention to supply problems is observing a downstream effect of the plague.

DC 17 — What a physician, senior administrator, or deeply informed observer knows

The number that does not appear in official dispatches: the Antonine Plague may have killed five million people in its first decade. Some regions have lost 10-15% of their population. The army’s recruitment from freed slaves and Germanic foederati is not a policy preference; it is a response to the fact that there are not enough men. The Danube frontier is under pressure partly because fewer soldiers are available to hold it. The party is living in a consequence of a catastrophe whose full scale is not discussed.

Galen of Pergamum – the most accomplished physician in the Roman world – was in Rome during the initial outbreak in 166 AD. He fled. He was summoned back by Marcus Aurelius. He has written the closest thing to an official medical account. His treatment protocols are the best available: rest, limited diet, maintain fluid intake. He does not know the cause. Nobody knows the cause. The best doctor in the world is managing symptoms of something he cannot explain, which is important context for trusting that Valeria is doing everything that can be done.

Three theological explanations coexist in every garrison: it is Apollo’s punishment for the Roman sack of his temple at Seleucia (the official implied position, behind the expiation rites); it is a natural phenomenon without divine cause (the Stoic position); various minority groups have their own frameworks. A character who understands all three can navigate the emotional reality of soldiers choosing between them, often in the same week.

Roman Engineering

Ability check: Intelligence (History) or Strength (Athletics)

You build things. That is not a metaphor. A Roman soldier is a soldier second and a laborer first: your unit has dug more miles of ditch, laid more feet of road, raised more timber walls, and filled more sandbags than any civilian contractor in the province. You know the castra – the marching camp – in your hands: the precise angle of the stakes, the depth of the ditch, the orientation (gate always faces east when terrain allows). You have helped build at least two bridges and you have opinions about the ones that were done wrong. The army builds because it must move, and it builds well because Rome requires that things last. A soldier who cannot swing a pick and handle a saw is a soldier who slows the column.

What you know without a check:

Athletics proficiency: Camp construction by muscle memory: you can raise a standard marching camp in the dark if the ground is right; you can estimate a wall’s load-bearing capacity by physical intuition from years of building and watching things that were built wrong fail; you know immediately if a fortification has structural problems.
Artisan’s Tools (any construction trade): The precision requirements of Roman surveying and what happens when they are ignored; you can identify a road or wall built correctly (one that will last a century) versus one built to look correct (one that will fail in five years); the specific errors that indicate either incompetence or deliberate sabotage.

DC 13 — What any legionary knows from daily service

The marching camp (castra): a full cohort can construct a standard marching camp in four to six hours on decent ground. The shape is a playing-card rectangle with rounded corners; one gate on each side; a ditch outside the palisade wall; internal layout standardized so any soldier can find the command tent, the latrines, and the hospital in the dark. Every legionary carries two stakes (pila muralia) as standard kit. They go into the palisade when camp is made.

Roads: the Roman road goes straight unless a straight line is impossible. Foundation first (large stones), then gravel fill, then the hard surface (via strata, from which our word “street”). A road built correctly drains to the sides and lasts a century. A road built badly floods and collapses within a decade. Legionaries build the foundation; specialist engineers design the routing. Most roads are crowned (highest in the center) to encourage drainage.

Bridge construction: the Roman timber trestle bridge can be assembled across a river of moderate width in one to three days by a prepared legion with the right materials pre-cut. The permanent stone bridge requires more time and resources but lasts indefinitely. A soldier who has helped build a bridge understands timber-frame joinery well enough to identify structural weaknesses in enemy fortifications.

Standard tools carried by a legion: picks, shovels, axes, saws, measuring cords, plumb bobs, and levels. The century’s equipment cart carries heavier tools. An engineer officer (architectus) directs major construction.

DC 15 — What a Faber, construction specialist, or multi-year veteran knows

Identifying structural weakness in a wall: the mortar joint pattern matters. A wall built with regular horizontal courses is stronger than one with random joints; a wall with vertical joints running all the way up is a weak wall. The base of a wall is the point of maximum stress under attack; a wall with a thickened base (talus) resists undermining better than one without. A soldier with this knowledge can look at an enemy fortification and identify the best point to concentrate pressure.

Aqueduct gradient: water flows because of slope, not force. An aqueduct that runs at too steep an angle loses water to splash and erosion; one that runs too flat stagnates. The correct gradient is subtle, approximately one foot of drop per mile, maintained over the entire length. The survey required to achieve this is precise and technically demanding. Aqueducts represent some of the most sophisticated engineering in the Roman world, and frontier soldiers know that their water supply depends on them holding.

Fortification against specific threats: a palisade wall holds well against infantry assault and arrows but is vulnerable to fire. A stone wall resists fire and direct assault but requires significantly longer to build. An earthen rampart with a palisade on top combines reasonable speed with reasonable durability; it is the standard for permanent frontier installations. The ditch in front of the wall matters as much as the wall itself; a ditch two feet deep with sharpened stakes (lilia) at the bottom stops a charge.

DC 17 — What an engineer officer, siege specialist, or architectus knows

The testudo is not only a defensive formation. It is a work platform. A locked-shield roof gives the front ranks enough protection to work on a gate or wall section with tools while under fire from above. Breaking a testudo requires either a heavy object dropped from directly overhead or disciplined flanking fire that forces shield-edges to separate. An officer who understands this knows both how to defend against it and how to exploit a wall that has no overhead ammunition prepared.

Undermining a wall is slower than it sounds but reliably effective if the soil conditions are right. Dig beneath the foundation, support the tunnel with timber props, fill the tunnel with combustible material, fire it. The support collapse brings down the wall section above. Counter-measures: dig a counter-tunnel from inside (the vibrations are audible at close range) or build the wall base wider and deeper than standard. If the north gate’s foundations were built to standard depth, undermining it would take 24-48 hours with the right tools and enough people who know what they are doing.

The three Roman siege engines worth knowing: the ballista (bolt-thrower, accurate to 400 yards, crew of two to operate), the onager (stone-thrower, shorter range, devastating against stone walls, crew of five), the scorpion (smaller bolt-thrower, direct-fire anti-personnel, crew of two). Each requires assembly, calibration, and pre-positioned ammunition. If the fort has a ballista that has not been maintained and calibrated in two seasons, it is a wall decoration, not a weapon.

Mars in 175 AD: The Frontier Cult

Ability check: Intelligence (History) or Wisdom (Religion)

Mars on the frontier is not the civic deity of the Roman games. Out here, he is older and closer. Soldiers who have seen the border violence do not pray to the statue in the principia aedes – they pray to the god they have felt watching from the tree line. You know the difference by now. The city Mars wants the proper form of words. The frontier Mars wants to see what you are made of.

What you know without a check:

Religion proficiency + Soldier background: The specific prayers said before battle; the names of Mars’ attendant aspects (Mars Ultor the Avenger, Mars Gradivus the Striding, Mars Silvanus the Forest); what a failed sacrifice means versus an ambiguous one.
Religion proficiency alone: Standard Mars cult obligations; festival dates; what constitutes a valid vow to Mars (specific, named, time-bounded) versus an invalid one (vague, conditional, bargaining).

DC 13 — What any soldier on the Germanic frontier knows

Mars Ultor, the Avenger, has a specific cult in frontier legions. His temples are simple – no mosaics, no gold leaf – because he does not want decoration; he wants the altar to be clean and the sacrifice to be genuine. The prayer before battle is spoken standing up, not kneeling; kneeling is for supplication, and supplication is not what soldiers do before a fight.

The spear of Mars (hasta Martis) exists in several traditions. In Rome, there is a spear in the Regia (the old royal house near the Forum) that is said to vibrate when Rome is threatened. Frontier soldiers know of a second tradition: the war-god sometimes leaves a weapon in a place where he has taken special interest. Such weapons are blessed and cursed simultaneously: blessed because they carry divine attention, cursed because divine attention is not the same as divine favor.

The correct response to an omen from Mars is action, not ceremony. A crow on the left of the march is a bad sign; the Roman response is not to stop and perform a rite – it is to form up correctly, check your equipment, and be ready for what the omen announced. The god does not expect you to bargain; he expects you to prepare.

DC 15 — What a veteran, haruspex-trained soldier, or frontier officer knows

The Mars Ultor cult at frontier legions includes a private rite performed after a significant battle victory, not before. The rite is simple: the officer who commanded takes the first enemy weapon recovered and breaks it, then buries the pieces at the camp’s east gate. This tells Mars that the enemy’s capacity for war in this location is ended. The rite is old enough that its origins are no longer documented, but it is consistently observed.

The frontier Mars is associated with wolves and with liminal spaces: borders, crossroads, places where two different territories touch. Germanic territories are liminal by Roman definition – the space that is neither Rome nor anything Rome has named. This is why frontier soldiers feel the god more strongly here than in the city. He is closer to his domain.

A vow to Mars is binding in a specific way: the god does not release vows, only satisfies them. If you vow to dedicate a piece of armor to Mars if you survive a battle, and you survive, the armor must be dedicated. Substitutions are not accepted. This is why experienced soldiers make their vows carefully: you do not promise what you cannot give.

DC 17 — What a senior haruspex, temple priest, or Marcus-Aurelius-era religious scholar knows

The phrase “Mars hears the loudest heart” appears in three places in this campaign. You will find it yourself, eventually: in an inscription in the vault, in Paterculus’s omen documentation, and in something Cassia says under her breath. It is not decoration. The phrase is from an old Mars cult formula that predates the Republic. It means that Mars responds to sincerity of intent, not volume of prayer. A soldier who is genuinely ready to die for their cause is heard more clearly than a hundred soldiers saying the correct words. This is the interpretive key to everything Mars does in Sessions 4 and 5.

The ancilia – the twelve sacred shields kept in the Regia in Rome, said to have fallen from heaven. The Salii priests maintain them. The tradition is that eleven of the twelve are copies, made to protect the original from identification and theft. The original has properties the copies do not. Those properties are passed orally and are not written down anywhere accessible.

A minority scholarly tradition adds a thirteenth: hidden because its existence is destabilizing. A divine weapon in the wrong hands does not simply make the holder powerful. It makes them the god’s agent, with the god’s agenda, whether they consented or not. The religious danger of the spear in the vault is specifically this: not that it corrupts the holder, but that it recruits them into a purpose they did not choose. Corruption is one effect. Recruitment is another.

The Spirits Under the Ground

Ability check: Wisdom (Religion) or Intelligence (Arcana)

The land under Vindolanda is old. Older than the Germanic settlement that left the ruins, older than the tribes that used the grove, perhaps older than the region’s human habitation in any form. Roman soldiers are trained to acknowledge the genius loci of any place they occupy. Most of them do it reflexively, the way they check their sword before leaving the barracks. What is under Vindolanda is not a standard genius loci.

What you know without a check:

Religion proficiency: The basic propitiation formula for a genius loci; how to identify that a place has an active spirit (temperature irregularities, specific plant patterns, animal behavior at the site boundary); why you do not build directly over a sacred spring without asking first.
Wisdom 14 or higher: You have felt the difference between a place that is ordinary and a place that is watching. This place is watching.

DC 13 — What any soldier who has been here long enough to notice knows

The spring in the northeast corner of the fort was sealed during construction – not diverted, sealed. The engineers put a stone cap on it and built the granary floor over it. Standard procedure would be to redirect the water; sealing a spring is unusual and was noted by the construction records (DC 12 Investigation to find this note).

Water from the sealed spring has been weeping up through cracks in the granary floor for three seasons. It evaporates quickly and has not caused structural problems. It is always slightly warmer than the ambient temperature, which is not how spring water normally behaves in winter.

The soldiers in the northeast barracks have had slightly fewer nightmares than the rest of the fort since the excavation began. This is not a rumor; it is a fact that Valeria has noted in her documentation without connecting it to the spring.

DC 15 — What a soldier with Religion training or extensive frontier posting knows

The genius loci of an active spring is a specific subtype of land spirit. It does not choose its location; it is the location, expressed as will. A genius loci of a spring is associated with protection of what grows above it, which in this case is the northeast barracks. It has been performing this function passively since the fort was built over it.

The sealing of the spring has not killed the genius loci; it has concentrated its effect. The water still flows, underground, and the spirit still acts. What the sealing has done is prevent the spirit from extending its protective influence further than approximately 50 feet from the spring site. The rest of the fort is outside its range.

The propitiation formula for a sealed spring genius loci: open the seal, offer clean water and a small food item, speak the standard acknowledgment formula (“I see you. I know this is your place. I offer this in recognition.”), and reseal if necessary. The spirit does not require permanent unsealing; it requires acknowledgment. A character who performs this rite correctly causes the spirit’s protective radius to extend to the entire fort for one week, providing advantage on Wisdom saving throws against the corruption mechanic for all characters within the fort.

DC 17 — What a scholar of pre-Roman religion, a specialist haruspex, or Cassia knows

The spirit under the northeast barracks is not the same as what guards the ruins below. They are distinct entities that have been in the same location for different lengths of time. The spring predates the Germanic temple by four to six centuries. It predates Rome in this region by even longer. It does not have a name in Roman tradition, or Germanic tradition, or anything in between. Thusnelda calls it “the old one under the water” in her language. That is not a name. That is a description used by people who know better than to name something they do not fully understand.

Here is the thing that changes how you read the fort: the spring spirit and the spear are in quiet antagonism. Since the excavation disturbed the temple below and brought the spear into the same vertical column of ground, the spring spirit has been suppressing the spear’s influence within its range. This is why the northeast barracks has had fewer corruption dreams than the rest of the fort. It is also why the spear’s influence has concentrated toward the west, where the genius loci has no reach.

A character who understands this can use the northeast barracks as a refuge from corruption pressure during critical sessions. They can also offer the genius loci something specific in exchange for temporarily extending its protection – to the party, to a specific location, for a specific duration. The spirit will not refuse a genuine acknowledgment. It has been waiting for one.

Germanic Religion: What Romans Encounter

Ability check: Intelligence (History) or Wisdom (Insight)

Roman soldiers on the frontier encounter Germanic religion as a practical reality, not a scholarly subject. You do not need to believe in Wotan to know that Germanic warriors who have dedicated themselves to him fight differently than ones who have not. You do not need to understand the grove tradition to know that going into one without being invited tends to go badly for Romans.

What you know without a check:

Survival proficiency + Insight proficiency: Pattern recognition about when Germanic behavior is religiously motivated versus tactically motivated; the specific signs that a Germanic warrior has taken a death-vow (they are not seeking to survive the engagement).
History proficiency: The basic Germanic divine hierarchy as Romans understand it: the one-eyed wandering god (Wotan), the thunder god (Donar), the earth goddess who is carried in a cart during her seasons.

DC 13 — What a frontier soldier picks up from experience and observation

Germanic warriors sometimes enter a state that Roman soldiers call rabies (frenzy) before battle. The external signs: deliberate hyperventilation, specific repeated phrases, working themselves into a physical intensity before contact. A warband that does this before a battle is significantly more dangerous in the first three rounds of combat and significantly less dangerous after that, because the state exhausts them. Roman doctrine is to hold the line, avoid breaking contact in the first minutes, and wait.

Sacred groves are genuinely dangerous to enter without invitation. Not because of supernatural effect (Roman soldiers remain officially skeptical) but because they are the specific thing Germanic tribes will defend to the last person. A Roman patrol that enters a sacred grove accidentally will draw the full response of every warrior within horn-range. This is not theological; it is empirical.

Germanic women perform religious functions that Roman women do not. The völva (staff-carrier, seer) is a respected figure who advises war-leaders and interprets signs. She is not a wife or a priestess; she is a specific role with specific authority. A Roman soldier who mistakes a völva for a civilian and treats her badly will have created a blood debt with her entire tribe.

DC 15 — What a scholar of the frontier, an explorator, or a soldier with years of contact knows

The Germanic sacred year is organized around agricultural rhythms but the military festivals do not align with Roman ones. The most dangerous season for frontier incursion is late winter into early spring: Germanic tribes have concluded their winter council (Thing) and made their decisions, the weather has broken enough to move, and they have not yet begun planting. This is when they raid.

The comitatus system: a Germanic war-leader’s followers swear personal loyalty to him specifically, not to the tribe. If the war-leader dies, the followers are expected to either avenge him or die trying; surviving a leader’s death without either is considered shameful. This makes Germanic war-bands extremely cohesive under pressure but creates a specific vulnerability: kill the leader cleanly and the warband’s cohesion fractures. This is documented Roman doctrine and works reliably.

Wotan sacrifice: the highest-value religious sacrifice in Wotan’s tradition is a human hanging, dedicated to Wotan. This is not the same as execution; it is a specific ritual with specific preparations. A body found hanging in the forest, if prepared correctly, is a religious offering, not a murder (though it may be both). Characters with this knowledge can identify the difference and understand what it means about the religious state of the nearby tribe.

DC 17 — What a scholar of pre-Roman northern European religion knows (rare; Thusnelda knows more)

The standing stones in the grove are not decoration. They are a long-term seiðr working – runes placed in specific patterns to create a sustained effect over decades, accumulated through every ritual performed at the site, going back to the pre-Germanic people who placed the original stones. The grove does not have a genius loci in the Roman sense. It has something more complex: a collective memory built from every act of genuine sacrifice ever made there. It cannot be dispelled. It is not a spell. It is the land remembering what it has been asked to hold.

The spear and the grove are connected by the original sealing oath. This is the specific thing Thusnelda insists on: not that the spear must be destroyed, but that it must be released correctly. The divine attention the spear carries does not dissipate if you simply break the physical object. It attaches to whoever broke it. They become Mars’s agent without consent. The grove provides the context in which the spear can be returned to its owner without residual effect. That is what the ritual is for.

Seiðr is specifically a women’s art in the dominant Germanic tradition. The social cost for a man who performs it is significant and categorized differently than simple stigma – it is understood as a blurring of social category rather than a moral violation. This context explains aspects of Thusnelda’s authority that Roman soldiers find confusing. She is not a priestess, not a chief, not a wife. She is something that does not map onto Roman social categories, which means trying to treat her like any of those things is a mistake.

Sacred Flora of the Frontier

Ability check: Intelligence (Nature) or Wisdom (Medicine)

The plants around Vindolanda are not decoration. Soldiers from the Mediterranean find them strange; soldiers from Gaul or the Rhineland recognize some of them; soldiers from deeper Germania could read them like a map. What grows where, what time of year, and in what condition tells the trained eye things that scouting cannot.

What you know without a check:

Survival proficiency: Which plants near the camp are edible, which are poisonous, and which to avoid in unknown territory.
Herbalist Kit proficiency: The basic medicinal plants of the frontier and their uses; which can be identified by sight versus which require laboratory analysis.
Medicine proficiency: The symptoms associated with plant poisoning versus other causes; which plants Valeria routinely uses and what she is out of.

DC 13 — What any frontier soldier knows from experience and warnings

Wolfsbane (aconitum napellus): Grows near the stream banks. Blue flowers. Extremely poisonous: death in a few hours from a small quantity. Every soldier knows not to touch it without gloves. It has no antidote that works reliably. Valeria treats wolfsbane poisoning by managing symptoms only.

Bog rosemary (Andromeda polifolia): Low shrub with small white flowers, grows in and around the bog. Not edible. Animals avoid it. The distinctive appearance (pale stems, rosemary-like leaves but with a grey-green color rather than silver-green) makes it identifiable to anyone who has been near the bog.

Elder (Sambucus nigra): Common near the settlement. Large shrub with flat white flower clusters. Berries are edible when cooked, toxic when raw. Germanic soldiers will not camp near a freshly cut elder tree; they say the spirit leaves when the tree is cut and goes looking for somewhere else to be, which is not a good thing to have in your camp.

Sacred mistletoe: Found on specific oak trees. Golden-green. Round clusters. Both Romans and Germans consider it significant; they assign different significance. Romans associate it with Druidic tradition (suspect in Roman terms) but recognize it as religiously potent. Germanic soldiers treat it as a protective plant.

DC 15 — What a Medicus, herbalist, or dedicated field forager knows

Wolfsbane: Used in very small quantities as a cardiac stimulant and local analgesic. Valeria knows this application but does not use it routinely because the therapeutic window is dangerously narrow. A character with herbalist kit proficiency and DC 15 Medicine can prepare a tincture that provides advantage on Constitution saving throws for 1 hour; wrong dosage causes disadvantage on all ability checks for 4 hours.

Bog rosemary: Dried and prepared as a tea, it provides 8 hours of advantage on saving throws against the Alp’s Sleep Paralysis (see bestiary). Valeria does not know this. A player who discovers it through experimentation or this check becomes a medical resource she will actively want to discuss with.

Sacred mistletoe: Harvested with a bronze (not iron) knife, offered on the grove altar, it counts as a valid sacrifice for the grove ritual – one of three items the grove will accept without requiring something personal from the character. The bronze knife requirement is specific and the Germanic tribes will not tell Romans this voluntarily; it must be discovered through this knowledge check or through Thusnelda’s trust.

Wild garlic (Allium ursinum): Grows in damp woodland near streams. Edible and used by both Romans and Germans. Medicinally: helps with blood pressure and minor infections. Practically: if soldiers in a barracks eat enough of it, Valeria notices the reduction in wound infections and asks where they are getting it. This is a way to build relationship with Valeria through dietary management rather than combat medicine.

DC 17 — What a specialist botanist, a völva, or a very experienced herbalist knows

Three things Thusnelda knows that no Roman text documents.

First: wolfsbane, in very specific preparation – dried root powder, mixed with spring water from an active genius loci, applied topically rather than ingested – suppresses the physical symptoms of corruption by 24 hours per dose. The preparation requires a DC 16 Medicine check and active spring water (the sealed Vindolanda spring counts if the seal has been acknowledged). The character does not recover corruption levels. The symptoms stop advancing for 24 hours. Thusnelda shares this only with people she trusts. If a character reaches that threshold with her, she gives it without being asked.

Second: the elder tree near the south gate has been growing for eighty years. The genius of this tree has accumulated enough history to serve as a record of significant events in its vicinity. A character who spends one full hour sitting with the tree in silence can roll DC 15 Wisdom to receive one impression from its memory – not words or images, but feeling-knowledge: who was in significant distress near this tree, and approximately when. The character cannot choose what impression they receive.

Third: the marsh orchid, rare, purple-spotted leaves, grows in the bog region. Medicinally inactive in standard use. The root is used at two specific stages of the Mithraic seven-grade initiation rite. A character who knows both the plant and the cult tradition (DC 17 Religion) can trace marsh orchid root traces in drainage channels to find the Mithraic chapel in the bathhouse annex without needing an informant. The traces are recent.

The History Beneath Vindolanda

Ability check: Intelligence (History) or Intelligence (Investigation)

The Romans have been at this location for forty years. The Germanic tribes have been here for three centuries. Before that, someone else. Soldiers don’t usually think about what came before the army. The ones who do discover that the ground they’re standing on has been significant to multiple civilizations and that none of them left for good reasons.

What you know without a check:

History proficiency: The official founding of this fort; its role in the frontier defense network; the names of the previous commanding officers (a wooden plaque in the principia lists them).
Soldier background + Investigation proficiency: Construction oddities that the engineers never documented: a drainage channel that routes around a section of ground rather than through it; a gate position that does not optimize sight-lines; a corner tower that is two feet thicker than the other three.

DC 13 — What a curious soldier picks up from observation and asking around

The fort was built on the site of a previous structure that no one documented carefully. The previous structure was not Roman; the stone type and tool marks in the lower foundation courses don’t match Roman technique. The army built over it because the ground was already cleared and partially leveled, which saved construction time.

The sealed spring was not sealed for sanitary reasons. The engineering report says “mineral contamination” but three soldiers who drank from it before it was sealed reported no ill effects. The true reason is not in any surviving document; the engineers who made the decision were rotated out within two months.

There is a section of the northeast palisade wall where posts do not go into the ground; they sit on a stone pad instead. This is structurally weaker than normal construction. It suggests the engineers encountered something underground at that location that made digging impossible or inadvisable.

DC 15 — What a scholarly soldier, a long-serving veteran, or an investigating character discovers

The pre-Roman structure was a circular building approximately 30 feet in diameter, positioned directly above the spring. The stone used is from a quarry that has not been active in Roman memory; the nearest matching stone deposits are 40 miles north. Someone transported those stones here specifically. The structure predates the Germanic settlement in this area by what archaeologists would estimate as two to four centuries if they were here, which they are not.

The Teutoburg Forest disaster (9 AD) had a specific aftermath here: a punitive expedition under Germanicus passed through this region approximately 15 years after Teutoburg. The expedition destroyed three Germanic sacred sites in the area. The destruction caused a refugee movement of religious practitioners toward this location; the Germanic temple below the fort was significantly expanded in the years immediately following the punitive expedition. The spear was moved here from a previous location as part of that expansion.

The older pre-Germanic structure connected to the spring is not a burial site. There are no human remains. It is a ceremonial space with a specific geometry: the entrance faces the midwinter sunrise direction and the exit faces the midsummer sunset direction. Whoever built it was tracking the sun’s annual cycle in a way that Roman and Germanic tradition both recognize but neither claims as their tradition.

DC 17 — What a specialist in pre-Roman northern European archaeology or a very experienced religious investigator discovers

The people who built the circular structure below the granary were not Celtic and not Germanic. The closest parallels are in structures that Roman archaeology does not reach – far north, in regions scholars have not documented. This structure is from a people who were here before the tribes who replaced them. It predates the Germanic settlement in the region by centuries. It is older than Rome’s interest in this part of the world.

The alignment tells you what they valued: the midwinter sunrise shines through the entrance, along the central axis, and out the exit for approximately three minutes. During those three minutes, a person standing at the structure’s center would be illuminated by direct sunlight. They built the entire structure around those three minutes. The spring is at the center of the alignment. This was not accidental.

The stone cap the Roman engineers placed over the spring sits on top of an older, better-fitted cap in a different stone type. Someone sealed this spring before Rome arrived. The Romans sealed it again without knowing it had already been sealed. Whatever they sealed, they had reasons.

A character who performs the acknowledgment rite for the genius loci and specifically asks what is sealed beneath – DC 16 Religion, requiring this DC 17 History check to know what to ask – receives one answer: “Not for long.”