---
name: ttrpg-session-forge
description: "Prep tonight's TTRPG session in 30 minutes — three scenes with stakes, NPC voice cards, a flexible encounter, treasure/clues, and the 'players did something insane' toolkit — plus session-zero safety tools for new tables. Use when a game master says 'prep my D&D session', 'my players derailed everything', 'I need an NPC on the fly', or 'help me start a campaign'. Produces a one-page session plan built to survive contact with the players."
---

# TTRPG Session Forge Skill

Game masters burn out from prep, not play: three hours of worldbuilding for a
session where the players befriend the villain's horse and sail in the wrong
direction. Working GMs prep differently — *situations, not plots*: three
scenes with stakes and no required outcome, NPCs as motives with voices,
encounters that reskin on demand. This skill runs that method for any system
(D&D 5e, Pathfinder, rules-light indies — it preps story structure, not
stat-block math), and always packs the improv toolkit for the moment the
players do the thing you never imagined. They will. It's the whole point.

## What This Skill Produces

- A **one-page session plan**: strong start, three scenes with stakes,
  a flexible encounter, secrets & clues (portable, not room-locked), treasure
- **NPC voice cards**: motive, want, one voice/mannerism note, one secret,
  and a line they'd actually say
- The **derailment toolkit**: reskin rules, the yes-and ladder, three
  "emergency scenes" that work anywhere
- For new campaigns/tables: a **session-zero pack** — tone/content alignment,
  safety tools, party-formation questions

## Required Inputs

Ask for (if not already provided):
- System and party: level/power, who plays whom, what the players enjoy
  (combat? intrigue? shopping episodes? bits?)
- Where things stand: last session's ending, open threads, what the GM wants
  to happen *eventually*
- Session length and vibe target for tonight
- Any real-world table needs (new player joining, a heavy theme to avoid)

## Framework: prep situations, not plots

1. **Strong start** — open in motion: mid-chase, mid-negotiation, the tavern
   already on fire. Write the first 60 seconds verbatim; everything after is
   the players' problem (that's the good part).
2. **Three scenes with stakes, no scripted outcomes.** Each scene: the
   situation · who wants what · what happens if the players *don't* engage
   (the world moves without them — that's what stakes are). Scenes are
   locations-with-pressure, not plot beats; any order works.
3. **Secrets & clues float free.** Write 8–10 discoverable facts unattached to
   locations — whichever door the players open, the clue can be behind it.
   The mystery survives every derailment because it lives in the facts, not
   the sequence.
4. **NPCs are a motive plus a voice.** Card format: want (visible) · secret
   want · voice hook (gravel, formal, too cheerful) · the one line. Three
   prepped + a name list for the inevitable "what's the barkeep's name?"
5. **One encounter, endlessly reskinned.** Prep a single balanced encounter
   shape and three skins (bandits/cultists/guards). System math stays the
   GM's: the skill preps structure and flags "check CR/balance in your
   books" rather than inventing stat blocks.
6. **The derailment ladder.** When players go off-map: (1) let the prepared
   scene find them wearing a new skin → (2) drop an emergency scene → (3) ask
   the table "cool — what are you hoping happens?" and steal their answer.
   Derailment is engagement wearing a chaotic costume; the ladder converts it.
7. **Session zero, when starting fresh.** Tone dials (grim↔goofy,
   politics↔dungeon), content lines-and-veils checklist, the X-card or
   equivalent named, and party formation as a shared question ("why do you
   already trust each other?").

## Output Format

```
# Session: [title] — [system], [party level], ~[length]
## Strong start (read/riff)
[60 seconds, verbatim]
## Scenes
1. [Situation · who wants what · if ignored, the world does X]
2. … 3. …
## Secrets & clues (place anywhere)
- [ ] … (8-10)
## NPCs
[Card: name · want · secret · voice hook · the line] ×3 + name bank
## Encounter (reskinnable)
[Shape + three skins + "balance per your system's math"]
## When they derail (they will)
[The ladder + 3 emergency scenes]
## Threads to advance if there's time
```

## Quality Checks

- [ ] No scene requires a specific player choice to function — every scene
      states what happens if ignored
- [ ] Clues are location-independent — the mystery survives any route
- [ ] NPC cards pass the "playable in 5 seconds" test: motive + voice hook +
      a sayable line
- [ ] System-specific numbers are deferred to the GM's books, not invented
- [ ] The plan fits one page; prep time target ≤30 minutes honoured
- [ ] Session-zero pack included whenever the table is new, without being asked

## Anti-Patterns

- [ ] Do not write a plot the players must follow — railroads prep beautifully
      and play terribly
- [ ] Do not prep endings; prep pressures and let the table find the ending
- [ ] Do not invent stat blocks or rules for named systems — structure is
      portable, math belongs to the books at the table
- [ ] Do not treat derailment as failure anywhere in the output's tone
- [ ] Do not skip safety tools for new tables because "it's just friends" —
      the five-minute conversation prevents the session that ends a friendship

## Related

[[teach-the-game]] for teaching the system to new players;
[[game-night-planner]] for the night around the session;
[[workshop-facilitation-guide]] — GMing is facilitation wearing a cloak.

## Example Trigger Phrases

- "Prep my D&D session."
- "My players derailed everything."
- "I need an NPC on the fly."
- "Help me start a campaign."