WARHAMMER 40K · ONE-SHOT KIT

🛠️ For the DM

One-Shot Session Skeleton

Warhammer 40,000 / D&D 5e Reskin — Blank DM Template

How to use this template. Fill every bracketed [PROMPT] field before game day. Leave nothing blank — even a rough answer now prevents a frozen-brain moment at the table. The template is not a script; it is a map. Players will wander off it. That is fine. Know the destination, not every road.

PRE-SESSION CHECKLIST

Complete this the day before, not five minutes before players arrive.

Materials

Space & Supplies

Rules

Tone & Safety (do this at the table, first five minutes)

THE ONE-SHOT STRUCTURE

BEAT 0 — COLD OPEN (first 5 minutes)

Drop players into action immediately. No tavern. No "you all meet." Mid-scene, stakes visible, dice possible within two minutes.

The opening image — what do the players see, hear, and smell the instant the scene starts?

[DESCRIBE: One vivid sensory sentence. E.g. "The shuttle shakes as las-fire streaks past the viewport. Through the smoke below, a hive-city burns."]

The immediate problem — what must the party react to RIGHT NOW?

[DESCRIBE: One concrete, urgent problem with no obvious solution. Not "find out what's happening" — something physical and immediate. E.g. "A bulkhead has blown out. Three Orks are already inside."]

The first roll (optional but recommended) — what's the opening action that gets dice on the table fast?

[NAME THE ROLL — Skill, ability, or initiative — and the DC or trigger. Reason: gets the table engaged kinesthetically within two minutes.]

The question this scene plants in the players' minds (the hook into the mission):

[WHAT DO THEY NEED TO FIND OUT OR DO? E.g. "Who sent the distress signal?" / "Is anyone still alive in that facility?" / "How do we get off this moon?"]

BEAT 1 — THE HOOK & MISSION BRIEF (~15 minutes)

Deliver the mission parameters. Players get their orders, learn the stakes, and choose to engage. Keep it short — one clear goal, one compelling reason to care.

Who delivers the briefing (NPC name, rank, motivation)?

[NPC NAME & TITLE]:
[WHAT THEY WANT FROM THE PLAYERS]:
[WHY THEY CHOSE THIS GROUP SPECIFICALLY]:
[ONE DISTINCTIVE MANNERISM OR VERBAL TIC TO MAKE THEM MEMORABLE]:

The mission in one sentence (what success looks like):

[MISSION OBJECTIVE — specific and achievable in a single session. E.g. "Reach the cogitator vault beneath Hab-Block 7, recover the encrypted data-coil, and extract before the facility is purged."]

Primary stakes — what is lost if the players fail?

[FAILURE CONSEQUENCE — make it concrete and immediate. Affects people the players can see, not abstract billions.]

Secondary stakes — what does each PC personally stand to lose or gain?

[PC 1 PERSONAL STAKE]:
[PC 2 PERSONAL STAKE]:
[PC 3 PERSONAL STAKE]:
[PC 4 PERSONAL STAKE]:
[PC 5 PERSONAL STAKE — if applicable]:

DM note: Personal stakes are the engine of investment. If you pre-gen the characters, build one personal connection to the mission into each sheet. Even one line is enough: "Your vow-brother is missing in that facility."

The one piece of information the players DON'T have yet (your first complication seed):

[WITHHELD FACT — something that recontextualizes the mission once revealed. E.g. "The briefing officer knows the facility is already lost — this is a decoy extraction to buy time."]

BEAT 2 — SCENE A: [NAME THIS SCENE] (~30–45 minutes)

The first major set piece. Establish the world, introduce an NPC or threat, let the players make a meaningful choice.

What is this scene?

Location — describe it in three sensory details:

[SIGHT]:
[SOUND]:
[SMELL or TEXTURE]:

Who or what is here (NPCs, enemies, or both)?

[ENTITY 1 — name, 40k type, 5e stat block]:  what they want / what they'll do
[ENTITY 2 — name, 40k type, 5e stat block]:  what they want / what they'll do
[ENTITY 3 — name, 40k type, 5e stat block]:  what they want / what they'll do

The central tension — what is the problem the players must resolve?

[PROBLEM]:

Three possible outcomes (prep all three; let the dice and choices decide):

Outcome What happens Consequence into Beat 3
Full success [DESCRIBE] [DESCRIBE]
Success at a cost [DESCRIBE] [DESCRIBE]
Failure / setback [DESCRIBE — failure should open a door, not close the story] [DESCRIBE]

What could go wrong that you didn't plan for?

[ONE "WHAT IF" — e.g. "What if they try to ally with the enemy instead of fight?" / "What if someone goes down immediately?"]
[YOUR RULING READY — a fast, fair answer so you're not frozen]

Clue or handoff — what do they learn here that propels them toward Beat 3?

[INFORMATION, ITEM, OR EVENT — make sure at least one clue is effectively un-missable (not gated behind a single hard roll)]

BEAT 3 — SCENE B: [NAME THIS SCENE] (~30–45 minutes)

The middle beat. Raise the stakes, introduce a new element, give a different character type a moment to shine (social, stealth, lore, investigation).

What is this scene?

Location — describe it in three sensory details:

[SIGHT]:
[SOUND]:
[SMELL or TEXTURE]:

Who or what is here?

[ENTITY 1 — name, 40k type, 5e stat block]:  what they want / what they'll do
[ENTITY 2 — name, 40k type, 5e stat block]:  what they want / what they'll do
[ENTITY 3 — name, 40k type, 5e stat block]:  what they want / what they'll do

The central tension:

[PROBLEM]:

Three possible outcomes:

Outcome What happens Consequence into Twist/Climax
Full success [DESCRIBE] [DESCRIBE]
Success at a cost [DESCRIBE] [DESCRIBE]
Failure / setback [DESCRIBE] [DESCRIBE]

What could go wrong that you didn't plan for?

[ONE "WHAT IF"]
[YOUR RULING READY]

Clue or handoff into the complication/climax:

[INFORMATION, ITEM, OR EVENT]

BEAT 4 — OPTIONAL SCENE C: [NAME THIS SCENE] (~20–30 minutes)

Use this if you have time and want a third beat before the climax — a short rest opportunity, a roleplay moment, or a second combat. Cut this first if running long.

What is this scene?

Location — describe it in three sensory details:

[SIGHT]:
[SOUND]:
[SMELL or TEXTURE]:

Who or what is here?

[ENTITY 1 — name, 40k type, 5e stat block]:  what they want / what they'll do
[ENTITY 2 — name, 40k type, 5e stat block]:  what they want / what they'll do

The central tension:

[PROBLEM]:

Clue or handoff:

[INFORMATION, ITEM, OR EVENT]

Cut note: if the clock says you're behind, skip this scene entirely and bridge directly to the Complication with a single line of narration: "As you move deeper into the [LOCATION], the vox-caster crackles — [COMPLICATION REVELATION]."

BEAT 5 — THE COMPLICATION / TWIST (~5–10 minutes, not a full scene)

This is a revelation or reversal that recontextualizes everything before it. It is not a combat encounter — it is information that raises the stakes or changes what "success" means. Deliver it as a narrative beat between scenes, not a full stop.

What is the twist?

[REVEAL — one sentence. E.g. "The data-coil was already extracted — by an Inquisitor from a rival faction who has now gone silent." / "The briefing officer is a heretic who sent you here to die." / "There is no extraction shuttle. There never was."]

How do the players learn it? (Pick one or combine)

How does this change the mission goal?

[NEW OR MODIFIED OBJECTIVE — the players now know more, and must choose how to proceed. Give them a genuine choice, not a forced path.]

What is the grimdark implication — the thing that makes this feel like a 40k story rather than a generic adventure?

[E.G. "Even the 'good guys' were complicit." / "The Imperium knew and sacrificed this settlement." / "The only way to succeed is to become the thing you were sent to destroy."]

BEAT 6 — THE CLIMAX (~45 minutes)

The most important beat in the session. This is what everything has been building toward. Give it space and energy. The climax should feel earned, dangerous, and narratively resonant.

What is the climax? (Check all that apply)

The Boss (if combat) — fill completely:

[BOSS NAME & 40k IDENTITY — e.g. "Brother-Sergeant Kael, Chaos Space Marine of the Word Bearers"]:
[5e STAT BLOCK USED (e.g. "Gladiator, CR 5")]:
[HP — consider boosting by 20-40% for a solo boss so it survives to round 3]:
[SPECIAL TACTIC — one signature move you'll use for narrative flavor, within the stat block's abilities]:
[MOTIVATION — what does the boss want, beyond killing the PCs?]:
[WEAKNESS OR DETAIL THAT MAKES IT PERSONAL to one PC]:
[WHAT HAPPENS IF THE BOSS IS REDUCED TO 25% HP? (Changed behavior, a speech, reinforcements, surrender?)]:

Mob support (2-3 adds to prevent action-economy collapse):

[MOB 1 — type, count, 5e stat block]:
[MOB 2 — type, count, 5e stat block]:
[MOB 3 — optional, type, count, 5e stat block]:

The arena — what environmental detail makes this feel like more than a blank room?

[HAZARD or TERRAIN FEATURE 1 — e.g. a plasma conduit that explodes if hit, difficult terrain, a crumbling gantry, chained prisoners]:
[HAZARD or TERRAIN FEATURE 2]:
[ONE DETAIL THAT IS CINEMATIC AND MEMORABLE — the thing the players will describe later]:

Three possible outcomes:

Outcome What happens What it means for the Imperium
Full victory [DESCRIBE] [GRIMDARK COST OR CAVEAT]
Victory at great cost [DESCRIBE — a PC may fall, a sacrifice may be needed] [DESCRIBE]
Pyrrhic / bittersweet [DESCRIBE — the mission succeeds but something precious is lost] [DESCRIBE]

DM note: In a 40k story, even a victory should carry weight. Resist the urge to make it a clean triumph. The Imperium endures, never wins. "The world is saved. This time."

BEAT 7 — RESOLUTION & DENOUEMENT (~15 minutes)

Wind down. Give each PC a moment. Land the themes. Let the players feel what happened.

The closing image — the last thing the players see before you say "and that's our session":

[ONE VIVID SENSORY IMAGE that echoes the opening image and completes the emotional arc. E.g. "The shuttle lifts through the smoke. Below, the hive burns. It was burning when you arrived. It will burn long after you're gone. The Emperor protects. You have to believe that."]

PC epilogue — one beat per character:

[PC 1]: [ONE SENTENCE — what did their choice here cost or earn them?]
[PC 2]: [ONE SENTENCE]:
[PC 3]: [ONE SENTENCE]:
[PC 4]: [ONE SENTENCE]:
[PC 5]: [ONE SENTENCE, if applicable]:

The last NPC moment — what does the briefing officer / faction handler say when they receive the report?

[LINE OF DIALOGUE — make it feel like the Imperium: utilitarian, faithless, or darkly grateful. E.g. "Your sacrifice honors the Emperor. The Munitorum will note your compliance. Dismissed."]

The unresolved thread (optional, for a potential follow-up):

[ONE THING LEFT UNEXPLAINED OR OMINOUS — the hint that the war never ends. Can be left as atmosphere even if there is no follow-up session.]

IF RUNNING LONG — CUTS

Check the clock at the start of Beat 5 (Complication). If you are more than 30 minutes behind, execute these cuts in order.

  1. Cut Scene C (Beat 4) entirely. Bridge to the Complication in one narrated sentence. This saves 20-30 minutes.
  2. Cut mob adds from the Climax. Run the boss solo or with only one wave of adds. Shorter combat. (Warn internally: solo boss is easier — consider adding one round-1 dramatic move.)
  3. Compress the Complication to a single vox-intercept or note found mid-Beat 3. Skip the separate delivery moment.
  4. Abbreviate the Denouement. Give PCs one word each ("what does your character do in the shuttle bay?") instead of individual scenes.
  5. Last resort: narrate the climax's outcome rather than playing it out. "The next ten minutes are fire and darkness and the sound of a power sword through ceramite. We can describe it, or we can play it — your call." (Players almost always choose to play it, but the offer slows nothing.)

IF RUNNING SHORT — ADDITIONS

Check the clock mid-session (roughly Beat 3). If you are more than 20 minutes ahead of pace, choose one of these fillers. Do not add more than one without checking pace again.

  1. A complication within Scene B — introduce a secondary NPC (a survivor, a prisoner, a rival warband member) with a competing agenda that must be negotiated or fought.
  2. An environmental hazard beat — the location does something: a blast door seals, the power fails, a fire spreads, a second wave of enemies arrives. No new stat block needed — pure narration + a DC 13 saving throw.
  3. A character moment — pause the action and address one PC directly: "While the others hold the line, [PC], you notice [PERSONAL DETAIL TIED TO THEIR BACKSTORY]. What do you do?"
  4. A loot-and-breathe beat — allow a short rest (1 hour = 1 in-fiction tense pause with a d8 Hit Die roll per PC). Use this to deliver a piece of lore via an item, a corpse's data-slate, or a dying NPC's last words.
  5. A second wave — re-use a stat block you've already run (the players know the enemy; it tests whether they apply what they learned). Add a named elite (a Nob, a Fanatic, a Veteran) as the second wave's leader.

SESSION TIMELINE

This is a target, not a contract. Adjust in real time. The only hard deadline is Beat 6 — the Climax must run before the last 20 minutes of your window.

Clock Beat Target Duration What you're doing
0:00 Pre-game setup 0 min Players arrive; dice, snacks, sheets distributed
0:00 – 0:15 Tone + safety check; character bonds 15 min Lines, Veils, X-card; each player says their PC's name and one-line role aloud
0:15 – 0:20 Beat 0 — Cold Open 5 min First sensory image; immediate problem; first dice on the table
0:20 – 0:35 Beat 1 — Hook & Mission Brief 15 min NPC delivers mission; stakes established; personal hooks introduced
0:35 – 1:20 Beat 2 — Scene A 45 min First major set piece (combat, social, or exploration)
1:20 – 1:30 Midpoint break 10 min Bathroom, snacks, air — do not skip this
1:30 – 2:15 Beat 3 — Scene B 45 min Second set piece; different character types shine
2:15 – 2:45 Beat 4 — Scene C (optional) 30 min Third beat or short rest moment — cut here first if behind
2:45 – 2:55 Beat 5 — Complication / Twist 10 min Revelation; mission recontextualized; new choice presented
2:55 – 3:40 Beat 6 — Climax 45 min Boss fight or set-piece showdown; full attention, slow it down
3:40 – 3:55 Beat 7 — Resolution & Denouement 15 min PC epilogues; closing image; final NPC line
3:55 – 4:00 Table debrief 5 min One-word go-round: "What was your favorite moment?"

Clock check ritual: Glance at the time at the END of each beat, not during. Write the clock target for Beat 6 (Climax) on a sticky note and put it where only you can see it. If you hit that time and aren't starting the Climax yet, cut immediately.

40K GRIMDARK FLAVOR REMINDERS

These are quick-access phrases and framing notes to keep the 40k tone alive without breaking your concentration on rules.

Phrases that never wrong for any NPC:

The grimdark reframe — when a player celebrates a clean win:

"You've won. The threat is contained. And yet — [insert cost: a civilian dead, a resource burned, a wall that now has a crack]. The Imperium endures. It always does."

When a player does something cool:

Don't hedge. Say "The bolt-round takes him in the throat. He doesn't get back up." Describe the result with weight. Grimdark action lands.

If the table gets too goofy and you want to re-anchor tone:

Have an NPC whisper a prayer in High Gothic. Describe the stench of the dead. Let a moment of silence happen. The setting re-grounds itself if you lean on sensory detail.

Template version 1.0 — Warhammer 40,000 / D&D 5e One-Shot Skeleton for a first-time DM. All mechanics are 5e RAW. All flavor is Games Workshop canon.

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