Chapter 4: The God’s Demand

Applying Guy Sclanders’ Methodology

Session Overview

Vindolanda has endured six days of siege without relief. Germanic warbands hammer the palisade, Brutus’ sleeper agents are torching stores, and the spear’s presence has warped every prayer in the shrine. At dawn Mars makes his demand clear: carry the spear into the ruins beneath the principia or watch the fort burn in his honor. The session asks the party to decide who they trust, which oaths they will break, and what they will offer a god before entering Session 5.

Level: 6 → Advance to 7 at session end
Duration: 3–4 hours
Key Goal: Escort the spear to the hidden stair while the siege collapses and prepare the sacrifice Mars requires
Theme: Loyalty vs. survival — when Rome cannot help, whose orders matter?

Guy Sclanders’ Principles Applied

Never Present Villain, Now Felt: Brutus never arrives, but his agents trigger fires and betrayals throughout the fort. His presence is felt in every sabotage.
Pressure Cooker: Food stores burning, a collapsed gate, a divine ultimatum, and three simultaneous crises force triage.
Three Clue Rule: Three independent signs explain Mars’ demand before the stair opens (see below).
Escalation: Session 3 held the walls. Session 4 pushes from regional stakes to divine intervention without leaving the fort.

Pre-Session Preparation

Tracking Sessions 1–3

Question	Session 4 implication
Who currently holds the spear?	That character becomes the focus of every NPC interaction. Mars speaks through them during Scene 3.
Is Tribune Lucius alive?	He still serves Brutus but now needs the party. If dead, replace his role with the Quartermaster (more stubborn).
Did Varro survive Session 3?	If yes he commands the escort. If no the party must appoint another Centurion and morale suffers (all soldiers take -1 to Wisdom saves this session).
Is Augur Cassia alive?	She is the only person who can interpret Mars’ omens accurately. Without her, the DM uses harsher omens and fewer answers.
Did Vercingetorix ally with the party?	His warriors can stage a diversion and guide the escort through tunnels. If hostile, they threaten to take the spear once it leaves the vault.

Siege Snapshot (Read or paraphrase at table start)

Rain lashes the palisade sideways. Three pyres burn inside the walls where supply sheds used to stand. The north gate hangs from one hinge, patched with a wagon body. Every street stinks of wet leather and cold iron. Trumpets sound twice in quick succession: first for fire, second for breach.

Then the shrine bell rings six rapid strikes. Cassia emerges with blood at her nose. “He wants it below,” she says. “He wants witnesses.”

Reactive World Setup

NPC	Status	What they are doing when the session opens
Legate Corvinus	Still in command but barely.	Assembling loyal cohorts to seize the spear once it moves.
Tribune Lucius	Cornered politically.	Offers to “escort” the spear so he can sabotage it for Brutus.
Centurion Varro	Exhausted and still calm.	Organises triage teams, refuses to abandon civilians.
Augur Cassia	Shaken by fresh visions.	Declares that Mars will open the stair only for those who swear a sacrifice.
Vercingetorix	Camped outside the south ditch under truce.	Sends runners promising safe passage if the spear is transferred to the grove instead.
Senator Brutus (off-screen)	Issuing raven orders.	Activates sleeper agents within the fort to burn the granary during Scene 1.

Three Clue Rule: Interpreting Mars’ Demand

Clue	Method	What it reveals
Shrine conflagration	Witness Cassia performing augury during the opening bell.	Mars shows the spear lying on the hidden altar. The vision includes three figures kneeling. Someone must volunteer to kneel.
Tunnel map	Discover in Varro’s office (DC 14 Investigation) or receive from Vercingetorix’s envoy.	The sealed stair connects to a collapsed Roman water tunnel that exits near the south ditch. A rune symbol indicates where Thusnelda first sealed the spear.
Saboteur confession	Capture a Brutus sleeper agent in Scene 1 (DC 15 Intimidation).	They reveal that Brutus ordered the fort burned to prevent Mars from being appeased. This tells the party the god can be bargained with if the spear reaches the ritual site.

Use all three clues to make sure the players understand what Mars wants before the escort begins.

Props and Handouts

Handout 8 (Revised): Brutus’ raven message intercepted in the watchtower. Replace the Triumph note with explicit orders to burn the granary and kill Cassia.
Handout 9 (New Purpose): The fort-wide order of battle for the siege day: trumpet codes, watch assignments, ration counts. Print for players to plan their escort.

Scene 0: Cold Open — The Bell and the Breach

Every scene should open mid crisis.

Read aloud:

You are already running when the bell rings. Smoke pours from the west workshops. The north gate creaks, splinters, and finally gives. A Germanic battering ram lurches through the gap. Varro shouts for shields to form. Cassia staggers out of the shrine with fresh blood down her chin.

“He demands the spear,” she says. “If we do not take it below by nightfall he will feed the fort to his wolves.”

Immediately throw three simultaneous crises at the table. They must triage:

Crisis	Mechanics	Stakes
Gate breach	Skill challenge: DC 14 Athletics or Strength-based attacks to hold the ram for three rounds while engineers wedge beams. Failure costs 1d4 soldiers and opens the fort to a wave of Berserkers (use Berserker stat blocks).	Lose the gate and the escort will face constant harassment when it begins.
Granary fire	DC 15 Survival or Create Water spell to douse. Each failed round removes 1d6 rations from stock.	Without grain, civilians riot and the escort lacks support.
Shrine desecration	Brutus’ agent attempts to steal the spear case. DC 14 Insight to notice him, then contested Dexterity vs. his +4.	If he escapes, Mars interprets it as defiance and adds +2 to all DCs during Scene 3.

Let the players decide which two they personally engage. The third crisis resolves off-screen based on NPC competence and previous favors.

Scene 1: Council in the Principia

Once the immediate crises settle the surviving leaders convene. This is the political pressure cooker.

Participants: Legate Corvinus, Tribune Lucius, Varro, Cassia, the party, optionally Vercingetorix via envoy.

Agenda: Decide the escort composition, oath terms, and what sacrifice Mars will receive.

Faction	What they want
Corvinus	Hand the spear to his bodyguard and keep the ritual within Roman hands. He will arrest anyone refusing.
Lucius	Destroy the spear en route. He proposes a “controlled detonation” inside the tunnels.
Varro	Include civilians and vicus elders in the procession because Mars demanded witnesses.
Cassia	Requires three volunteers to kneel with her when the stair opens. She wants the party to choose who kneels.
Vercingetorix	Offers to stage a diversion if the Romans swear to return the spear to the grove afterward.

Meaningful decision: The party must set the terms of the escort. Choose one of the following or craft a hybrid:

Roman Authority (Corvinus): Gain extra legionaries but suffer disadvantage on Persuasion checks with Vercingetorix later.
Shared Custody (Varro + Cassia): Choose three kneeling witnesses (could include PCs). Receive advantage on future dealings with Mars but weaken the escort’s numbers.
Secret Transfer (Lucius): Attempt to fake the ritual and destroy the spear. This is a betrayal path. If selected the DM prepares separate complications.

Whatever they choose determines which NPCs accompany them below and who betrays them later.

Scene 2: Preparing the Procession

Give the players time to plan. Use the revised Handout 9 to show watch rotations and tunnel routes.

Possible preparations (allow up to three):

Scout the hidden stair (DC 14 Perception): reveals a pressure-plate trap left by Romans (disarmed with Thieves’ Tools DC 13).
Secure the vicus (Social encounter): calm civilians with DC 15 Persuasion to prevent panic when soldiers march with the spear.
Call in favors (Reputation system): spend camp reputation to gain extra medics or a Germanic guide.
Blessings (Religion or Performance DC 14): Cassia or another priest performs a rite that grants +1d4 temp HP to the escort.

Failure on any prep roll introduces a complication inside the tunnels (collapsed passage, frightened auxiliary, etc.).

Shadow-cursed character (if present): During the preparation phase, before the party descends, give this character a private moment if they step away from the group or look toward the south. Read or paraphrase:

The trees beyond the south ditch are still. The Germanic camp is there, but the forest behind it is dark and motionless. Then your shadow stretches. Not with the torchlight: against it. It extends southward, toward the trees, like a hand reaching for something it recognizes. You feel it move before you see it. It stops at full extension and waits.

The character can follow (moving toward the grove and Vercingetorix’s camp), pull back (DC 12 Wisdom saving throw or the shadow takes a full round to retract), or simply watch. Whatever they choose, the shadow retracts before anyone else notices. This is the grove moment from the Player Character Variants section in gm_intro.qmd: trigger the full reset of the fading mechanic now. If the character moved toward the tree line: they also hear the phrase. See gm_intro.qmd for its content.

Scene 3: The Procession Below

Read aloud when the stair opens:

The flagstones of the principia* grind apart. Cold damp air rises carrying the smell of old blood and iron. Torches gutter sideways even though there is no wind. The spear pulses once with a deep red glow. Mars has opened the way.*

Treat the tunnels as three consecutive scenes:

The Sunken Armory: Fallen Roman armor pieces animate when touched by spear-light. Use Animated Armor stat blocks. They target anyone who hesitates. Clue hidden under a corroded shield: a Latin inscription reading “The god hears the loudest heart.”
The Choking Hall: Poisonous gas vents. Constitution saves DC 14 each round unless characters use the rune map to find fresh air pockets. Cassia can spend a spell slot to clear the hall.
The Elder Stair: Narrow steps descending around a dry well. Brutus’ agent springs his trap here: he triggers a rockfall attempting to bury the spear. Dexterity saves DC 15; failure deals 2d8 bludgeoning and drops the spear, requiring a contested Strength check to keep it from sliding into the shaft.

At each scene ask the party who leads, who guards the civilians, and who carries the spear. Those choices affect Session 5 corruption checks.

Three Kneeling Figures: When they reach the final door Mars demands three mortals kneel in submission. Cassia insists one must be Roman, one must be Germanic, and one must be tied to the spear. Let the party fill these roles. If they refuse Mars adds an extra trial in Session 5.

Scene 4: The Antechamber of Mars

Read aloud:

The chamber beyond is circular, carved before Rome existed. The air hums like taut bowstrings. In the center stands the same granite altar where the spear once rested. Above it hangs a vision of Vindolanda seen from the clouds: burning, flooded, broken. Mars’ voice vibrates in your bones rather than your ears. “Bring me what is mine and speak your price.”

Here the party declares the sacrifice they will offer. Options include:

Blood: Lose 10 HP per kneeling volunteer. Mars accepts and removes one corruption stage from the chosen character.
Glory: Swear to bear the blame for whatever follows. The party gains advantage on Persuasion versus legionaries but becomes the scapegoat if things go poorly.
Obedience: Promise to carry out Mars’ Call to War (Session 5 mechanic). Guarantees a favorable start to the final trial but obligates them later.

After the offering the spear levitates to the altar. Mars’ voice states: “Tomorrow you stand before me.” Immediately cut to the fort above where the siege pauses. Germanic horns fall silent. Every NPC knows something profound just occurred.

Consequence Setup and Level Advancement

Advance all PCs to Level 7. Their exhaustion remains.
Record who knelt, who carried the spear, and which factions were appeased. These decide the starting conditions in Chapter 5.
If Corvinus felt sidelined he arrests Cassia at the end of the session, forcing a rescue during Session 5’s opening.
If Lucius’ sabotage succeeded the spear is damaged, giving Mars disadvantage on his initial checks but enraging him.
If Vercingetorix was honored his warriors guard the fort through the night, granting a long rest.

Provide a closing read-aloud to reinforce the victory:

Night falls. The rain stops. In the distance wolves begin to howl and then silence themselves, one by one, as if someone stronger demanded their quiet. Vindolanda breathes for the first time in a week. Tomorrow a god arrives.

DM Notes

OGAS This Session

NPC	Objective	Goal (Session 4)	Agenda	Secret
Legate Corvinus	Secure his legacy and the spear.	Control the escort to claim credit.	Uses military law to threaten anyone opposing him.	Knows his report to Rome blamed the party; fears exposure.
Tribune Lucius	Survive Brutus’ falling star.	Destroy or sabotage the spear without dying.	Offers cooperation while planting traps.	Still receives ravens from Brutus ordering Cassia’s death.
Centurion Varro	Keep his people alive.	Put the right soldiers in the escort.	Appeals directly to the party’s honor.	Hiding the fact that morale is near collapse; only the party can steady it.
Augur Cassia	Prevent Mars from razing the fort.	Deliver the spear and interpret the omen correctly.	Demands oaths, shares visions, speaks plainly now.	Knows that if no one kneels she will do it alone and die.
Vercingetorix	Seal the spear forever.	Use the chaos to secure a promise to return it to the grove.	Negotiates through runners, offers warriors.	Dying faster; this is his last chance to protect his tribe.
Senator Brutus	Stop Mars from being appeased.	Burn the fort or kill Cassia before the ritual.	Commands sleeper agents and promises gold.	Has already arranged a Plan B ritual in Chapter 5 if this fails.

Running the Siege

Keep the pressure visible even during talking scenes. Describe smoke in the audience chamber, tremors as battering rams strike, civilians chanting prayers.
Use resource clocks: Food (starts at 3, loses 1 per failed fire roll), Morale (starts at 2, loses 1 if Corvinus bullies or if civilians panic). If either hits 0 the escort suffers disadvantage on initiative inside the tunnels.

Hooks for Session 5

Record every promise made to Mars, Varro, Vercingetorix, or Corvinus. Mars demands payment next session.
Decide which NPC accompanies the party into the divine arena. Whoever knelt is eligible; whoever betrayed is judged.
If the spear was damaged or hidden, plan how Mars reacts (he knows who lied).

Vindolanda now sits in silence awaiting a god. Chapter 5 opens with that god’s arrival.

Skill Audit: Session 4

How to run the crisis checks:

Gate breach: DC 14 Athletics to hold the ram. - Land 5 below: The gate holds two rounds instead of three. One more soldier down before the engineers arrive. The partial success costs something real. - Exact: Three rounds, beams wedged. The gate holds. - 5 above: Gate holds AND the party gets a specific look at the ram-crew commander: a Germanic warrior with an amber war-charm carved with TIWAZ on his belt. Note that. It is information for Sigrun: a specific chieftain’s people, not the united warband. This matters in Session 5.

Granary fire: DC 15 Survival. - Land 5 below: Fire controlled, but rations take 1d6 reduction. They saved what they could. That is a real result: not failure, a cost. - Exact: Fire stopped. Full ration stock. - 5 above: Fire stopped early enough to find the slow-burn candle setup before it is consumed. The arson method is now physical evidence. See locations.qmd for what this reveals.

Shrine desecration: DC 14 Insight to notice the agent. - Land 5 below: Something is wrong, noticed one round late. Contested Dex rather than auto-notice. - Exact: Notice as he starts. Contested Dex as written. - 5 above: Notice AND see that he avoids the threshold rune Paterculus placed deliberately. He knows the ward system. Someone briefed him. That is not a coincidence: someone inside the fort told him what the wards look like.

Cascade unlock: the soldier who held the wall (DM only)

If Flavus was named in Session 2 (from the DC 17 cascade there), he shows up here as an escort volunteer without being asked. He does not need to be recruited: he recruits himself. If he was not named in Session 2: use Varro’s recommendation instead. Different path, same result, but it lacks the satisfaction of a name the party earned earlier.

Temporal gate: Mars’ arrival read (Scene 3, the Elder Stair).

One round. One check. The first character who carries the spear through the Elder Stair.

DC 13 Insight: The spear’s weight shifts toward the altar chamber before the character can see it. The direction is specific. Consistent. The spear knows where it is going.
What it opens: In the antechamber, this character has advantage on the first Persuasion check with Mars if they mention this. “The spear remembers this place” is an argument Mars finds interesting. It tells him they were paying attention to what the divine object was doing rather than just carrying it.
Why the window closes entering the antechamber: The shift stops the moment the spear can sense the altar directly. It no longer needs to pull: it can see where it is going. The moment of information passes. If they did not notice it on the stairs, they do not get it at the door.

Three kneeling witnesses: partial success structure.

Do not make this binary. Add texture:

One volunteer: Mars allows it. But he started disappointed. The trials in Session 5 begin with one additional consequence already in effect. Let the players feel that he noticed.
Two volunteers: He accepts with reservations. Session 5 begins normally.
Three volunteers, correct composition (one Roman, one Germanic, one spear-touched): Mars is satisfied. One trial in Session 5 drops one difficulty tier. Your choice which. Pick the one that will make Session 5 most interesting.