The Corruption of Mars
Part III covers the mechanics that run beneath the campaign. Read this when something mechanical needs explaining: corruption, reputation, how to track your story, what the atmosphere of each session sounds like.
This chapter belongs to you, not to the GM. Corruption is not a punishment mechanic. It is the story of what happens when a god of war pays attention to a mortal, and what that attention costs.
What Corruption Is
The spear is an artifact of Mars’ anger, and it does not corrupt you by making you evil. It corrupts you by making you more of what a soldier is already trained to be: effective, aggressive, committed to victory at the expense of everything slower and softer. The legions train their soldiers to suppress hesitation, to act before the moment passes, to subordinate personal feeling to tactical necessity. The spear takes that training and amplifies it until it crowds out everything else. You do not become a monster. You become a soldier so thoroughly that you forget how to be anything else.
The corruption is Mars’ interest made tangible. He has noticed you. His nature, ancient and absolute, is seeping into yours the way water seeps into stone: patient, total, and not reversible by simply deciding it should stop. What this means in practice is that the world starts to make a particular kind of sense: conflict is clear, peace is murky, enemies are obvious, the people who slow you down are obstacles. This clarity feels like an improvement, at first. It is not an improvement. It is a narrowing. Whether that narrowing costs you everything depends entirely on what you choose to do with the attention you are receiving, on whether you use the god’s focus or let the god’s focus use you.
The Six Stages
You will learn what each stage means when you reach it. The descriptions below are sealed until then. Open one only when your GM tells you that your corruption has moved.
Level 0: Unmarked
You are yourself. The full range of human experience is available to you: boredom, affection, grief, humor, the specific pleasure of a good meal after a long march. The campaign has not yet asked more of you than you are.
What others notice: Nothing unusual. You look like what you are: a soldier, a specialist, a person with a history and a future. Your eyes are calm. You sleep when you have the chance.
What you find normal: You think about your work in ordinary terms. An enemy is a person you may have to fight. A decision costs you something when it is hard. You remember why you are here.
Mechanical effect: No effect. You are the baseline.
Journal prompt: Who was I before this campaign began, and what did I want from it?
Level 1: Noticed
Something has shifted in your dreams. You cannot always say what you saw when you wake, only that the dream left a residue of iron and distance that takes an hour of daylight to clear. Mars has seen you. He finds you interesting. He has not yet done anything about it, but the awareness of his attention sits somewhere at the back of your skull like a coin in a dark pocket.
What others notice: You are quieter than you used to be. Not sullen; quieter, as though something is using up bandwidth that used to go toward conversation. Your sleep is sometimes troubled, though you do not always remember why. You flinch at nothing, but occasionally you are somewhere else while your eyes are still open.
What you find normal: Violence requires slightly less mental preparation than it used to. Not that you seek it; just that the inner resistance is a degree lower, the way a door that has been used enough swings a little more freely. You notice the tactical possibilities of a room before you notice its inhabitants.
Mechanical effect: Disturbing visions of conquest visit you in sleep; make a DC 10 Wisdom saving throw to remember the dream clearly rather than waking with only a sense of unease.
Journal prompt: What did I dream about, and what does it say about what I am afraid I already want?
Level 2: Pulled
The spear’s logic makes a certain kind of sense. You catch yourself thinking in terms of targets and obstacles rather than people and situations. A man arguing with you is not a man with a grievance; he is a problem to be resolved or removed. A crowd blocking the road is not a crowd; it is a delay with a solution. This is not malice. It is efficiency. You notice it and you tell yourself it is fine.
What others notice: Your patience has shortened. Not dramatically; you are still functional, still professional. But the margin between frustration and action is narrower now, and people who know you well can see it. You speak about violence casually in conversations where it is not necessary. When a fight starts, you are faster than you should be, calmer than you should be, settled into it in a way that is slightly uncomfortable to watch.
What you find normal: You calculate odds of survival for people before you calculate whether you like them. You notice the weapons in a room before you notice the faces. When a conversation becomes complicated, a small voice suggests that it would be simpler with fewer participants, and you have to make a deliberate effort to close the door on that suggestion.
Mechanical effect: You have disadvantage on Wisdom saving throws.
Journal prompt: When did I stop thinking of an enemy as a person, and can I remember the last time I thought of them as one?
Level 3: Claimed
Battle is the clearest your mind has ever been. Everything inside a fight is crisp and specific and right: the geometry of the engagement, the weight of the weapon in your hand, the way the enemy’s weight shifts before they move. Everything outside of combat feels slow and muffled by comparison, like trying to listen through water. You are not unhappy. You are something more precise and narrower than happy.
What others notice: You are difficult to reach when there is no immediate threat. Conversation requires effort from you and produces effort in return: your answers are present but not warm, your attention is real but roving toward exits and approach angles. You are still capable of connection, but it costs you, and sometimes you choose not to spend what it costs. In a fight, you are extraordinary to watch, and slightly frightening. You do not stop when things are resolved. You stop when you decide to stop.
What you find normal: Peace feels like waiting. You are genuinely content in the moments before a conflict that you can see coming; the anticipation is pleasant in a way that makes you slightly uneasy when you examine it directly. You have stopped apologizing for roughness and started regarding it as efficiency. The people in your life who require softness from you feel remote.
Mechanical effect: When you are in combat, make a DC 12 Wisdom saving throw to choose to disengage willingly.
Journal prompt: What am I afraid I am becoming, and is the fear of it the only thing still keeping me from becoming it fully?
Level 4: Transformed
The anger is not yours anymore. That is the thing you have to understand about this stage: what you feel when you fight is genuine and total, but it belongs to something much larger than you, and you are the vessel it flows through. A loan from Mars, with terms you did not read before signing. You are extraordinarily effective. You are also not entirely sure where you end and the loan begins.
What others notice: Your eyes change in combat. People who know you will notice it: a quality of focus that is inhuman in its completeness, a stillness that exists beneath the violence. Outside of combat you are present and functional and recognizably yourself, but there is a weight to you now, a gravity that was not there before. Priests of Jupiter and Minerva go slightly still when they look at you. Animals are uneasy. The people who love you can still reach you, but the reaching requires courage.
What you find normal: You have stopped second-guessing decisions that involve force. Not because you are certain you are right, but because the doubt is quieter than the directive, and the directive is louder every day. You still know the difference between a justified act and an unjustified one. The difference has simply become less operationally relevant than it used to be. You eat alone sometimes without noticing you have chosen to.
Mechanical effect: When reduced below half your maximum hit points in combat, make a DC 14 Wisdom saving throw or attack the nearest creature, ally or enemy.
Journal prompt: What would I have refused to do at the start of this campaign that I now find reasonable, and what would the person I was then think of my answer?
Level 5: Gone
Not dead. Gone. The person who enlisted at the start of this campaign is still present somewhere, the way a city is still present after it is garrisoned by a foreign army: the buildings are there, the streets are there, but someone else is giving the orders. Mars is paying very close attention now. He considers what he is doing a form of completion.
What others notice: Your eyes do not settle on people the way they used to. They settle on threats, resources, and nothing else. You speak in the register of command and assessment. You are not cruel, precisely; you are indifferent to everything outside the parameters of whatever Mars currently wants, and cruelty would require caring enough to choose it. People who have loved you find the interaction disorienting in a way that is worse than grief.
What you find normal: You do not find things normal or abnormal. You have objectives. You move toward them. The question of what you want, separate from the question of what you have been directed to want, has no current answer.
Mechanical effect: You are fully corrupted; you become an NPC under the GM’s control unless the party intervenes before the end of the session in which Level 5 is reached.
Journal prompt: Is there anyone who could bring me back, and do I want them to try?
Corruption and the Gods
Open when you reach Level 2 or higher
The gods of this world are not neutral observers of Mars’ project. Each has a position, and each position has practical consequences for a corrupted character.
Mars: He views high corruption as evidence of a soldier worth his attention. This is not kindness; it is interest, the way a craftsman is interested in a tool that performs well. At Level 3 and above, Mars may send the character private guidance in the form of dreams or visions during rest: the GM decides what is communicated and when, and the guidance is not always benign. At Level 5, Mars considers the character his, and he is not wrong about that.
Jupiter: The king of the gods does not approve of what Mars is doing to a mortal under his nominal protection, but Jupiter governs through authority rather than intervention, and Mars operates within his domain. At Level 3 and above, the character finds that Jupiter’s temples feel cold: the warmth of divine presence has been replaced by something formal and distant. Augury that involves the character produces confused or contradictory results. Jupiter watches, disapproves, and waits for a mortal to make the choice that would give him legitimate grounds to act.
Minerva: The goddess of craft, wisdom, and deliberate action watches corruption closely, because corruption is, in her view, a failure of judgment rather than a failure of will. She is the god most likely to offer an alternative: if a corrupted character performs a specific act of craft or wisdom during downtime (writing a letter they have been avoiding, completing a piece of work that requires patience rather than force, resolving a conflict through understanding rather than pressure), Minerva may reduce their corruption level by 1. This happens at the GM’s discretion, once per session, and it requires that the act be genuine rather than transactional.
Janus (deus of thresholds and transitions): At any corruption level, a character can appeal to Janus at a liminal moment: entering a new city, crossing a river, passing through a gate, beginning a new day. This appeal costs a small offering left at any doorway or threshold (food, a coin, something personal). The benefit is a one-time advantage on the next Wisdom saving throw the character makes. Janus does not judge the nature of the corruption; he governs transitions, and the appeal to him is itself a kind of transition, a declaration that something is about to change.
Hades (shadow-cursed characters only): If you carry the Spartan-lineage shadow compact, Mars’ corruption does not claim you in the usual way. Hades holds a prior contract, and prior contracts have standing even among gods. When you would gain a corruption level from a divine source (the spear, the grove ritual, Mars’ direct attention), you make a DC 13 Charisma saving throw. On a success, the corruption does not take hold: Hades’ claim deflects it. On a failure, you gain the corruption level normally and also gain a shadow-curse manifestation (your GM will describe this; it is visible and strange). On a natural 1, you gain two levels at once. This is not protection. It is interference from a competing claim. The result is that your corruption track is unpredictable in both directions: you may resist corruption others cannot resist, and you may fall further in a single moment than any standard track would allow. Ask your GM if you are uncertain whether a corruption source is divine.
Resisting Corruption
What works:
Genuine human connection. The corruption requires isolation to function at its most efficient: it narrows attention to threats and targets, which means it requires the elimination of the things that remind you what you are fighting for. Being genuinely witnessed and cared for by another person, in a scene that is not about combat or tactics, interrupts the narrowing. It does not remove corruption, but it slows the pull. Tell another party member what is happening. Let them respond. Scenes like that are the campaign working the way it is supposed to.
Completing a votum (a vow) to a non-Mars deity, specifically about a non-violent act. The vow must be real: framed before a witness, carried out in full, reported to a priest. A votum made and fulfilled reduces corruption by 1 at Levels 1 and 2, and opens the possibility of the grove ritual at Levels 3 and 4.
The grove ritual (see the GM for specifics): available up to Level 4, requiring a significant sacrifice of something personally meaningful and a witnessed act of deliberate restraint in a situation where violence was possible and chosen against.
What does not work:
Trying to logic your way out. Understanding the corruption academically does not reduce it. A character who can describe exactly what is happening to them, in precise mechanical and theological terms, while continuing to act under its influence, is not recovering from it. The corruption is not a misunderstanding; it is a condition.
Performing acts of violence and categorizing them as necessary when they were not. The corruption is very good at finding the category “necessary” and expanding it to cover anything it wants to cover. Acts of violence that were genuinely required to survive do not increase corruption. Acts of violence that were chosen because they were easier than restraint do.
Pretending the corruption does not exist. It exists. It is the chapter you are reading right now.
What is too late:
Level 5 cannot be reduced by mundane means, downtime, or standard ritual. The grove can lower corruption from Level 5 to Level 4, but it cannot clear Level 5. Only direct divine intervention clears Level 5: Mars releasing the character voluntarily, or another god of sufficient standing interceding on the character’s behalf. The specific shape that intervention takes is the campaign’s ending. It is not a given. It requires the character, and the party, to have done something that gives a god a reason to act.
Corruption recovery rules: A character can attempt recovery during downtime using the Religious Observance activity (see professions.qmd). Three consecutive sessions of observance without gaining additional corruption reduces corruption by 1 (Levels 1 and 2 only). Levels 3 and 4 require the significant sacrifice described in the grove ritual. Level 5 requires the arena.
Corruption as Story, Not Punishment
You picked up the spear. Or you stood near the person who did, and Mars decided you were interesting. That is the premise. What happens next is not predetermined, and it is not a trap.
The most compelling characters in Session 5 are the ones who are corrupted and still trying. A character at Level 4 who walks into the arena knowing what they are, who chooses to act against their corruption in the worst possible moment, is making the bravest choice available to a mortal in this world. A character at Level 2 who stops between sessions to tell the party: “I noticed something in myself today that frightened me,” is opening a scene that the campaign was built to hold.
Do not hide corruption from the party. The corruption benefits from silence and isolation; that is how it works. A character who keeps their corruption secret is giving the mechanic exactly the conditions it needs to function. Sharing it costs you something: it is uncomfortable to say “I am becoming something I am not sure I want to become” out loud at the table. That discomfort is the scene. That is what you are here to play.
Do not play corruption as a villain arc unless that is what you want and the table has agreed. A corrupted character who is still choosing, who is still showing up for the party and fighting the pull, is a more interesting character than one who gives in. Level 4 corruption is not an instruction to betray your companions; it is an invitation to show what you do when the worst version of yourself has a vote.
The journal prompts at each stage are for you, between sessions. They are not required, but the players who use them report that they produce better in-session choices, because those choices have context. You are building the interior of a character that the table can only see from the outside. The more clearly you know what is happening inside, the more legible and meaningful the outside becomes.
You are playing someone that a god has decided is worth watching. That is a terrifying position and an extraordinary one. The campaign will ask you to be both things at once.
Mars does not want you to fall. He wants to see what you do when falling.