Ready-to-run 30-minute adventure

d&d one shot for 2 players

The Glass Key Job: A two-hero heist that uses stealth, social play, and a boss who should not be fought fair.

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Level 2
2 players plus optional sidekick
75–120 minutes
Candlelit museum heist

Adventure Hook

A retired thief hires the two heroes to steal back a glass key from a private museum before midnight, when the key unlocks every door in the city for exactly one minute.

Read-Aloud Opening

“Rain needles the skylights of the Velorian Museum. Across the street, an old woman with a thief's smile slides you a charcoal floor plan. 'The glass key is in the Moon Room,' she says. 'Do not let it see its own reflection, and do not be inside when midnight teaches every lock in this city to forget its name.'”

DM Brief

  • Two-player D&D works best when failure creates complications instead of dead ends.
  • Give the party a helpful sidekick only if both players are fragile. Sella, a nervous locksmith, can Help once per scene and has 10 hit points.
  • The villain is not a brute. Curator Vey wins by alarms, locked doors, and animated exhibits.

Scene 1 — The Locked Garden

20 minutes

“The museum's garden wall is slick with rain. Marble saints stare down from the roofline, and every iron gate is chained from the inside. A single lit window glows on the second floor.”

Goal: Offer multiple entry paths so two players can specialize.

What Happens

  • • Entry options include climbing the wall, talking past a bored guard, using the drainage culvert, or creating a distraction at the front gate.
  • • A raven-shaped alarm charm watches the garden. It can be covered, distracted with shiny metal, or dispelled with a good check.
  • • On success, the party enters with surprise. On a noisy success, Vey knows intruders are inside but not where.

Checks

  • • Athletics or Acrobatics DC 12 crosses the wall.
  • • Deception DC 13 convinces the guard the party is expected.
  • • Arcana DC 12 blinds the raven charm for ten minutes.
Fail forward: If the party fails twice, Sella or the guard accidentally opens a service door, but one animated broom begins stalking the hall behind them.

Scene 2 — The Hall of Borrowed Faces

25 minutes

“Portraits line the hall in gilded frames. As you pass, painted eyes open. One portrait clears its throat and says in your voice, 'We are definitely not thieves.'”

Goal: Create a social puzzle instead of a large combat encounter.

What Happens

  • • The portraits demand a secret before revealing the Moon Room door. Any true secret works, even a silly one.
  • • A character can instead identify the oldest portrait and flatter it into cooperation.
  • • If the players try to smash frames, the portraits scream and summon two Glass Motes.

Checks

  • • Persuasion DC 12 gets the portraits gossiping about Curator Vey.
  • • History DC 11 identifies Lady Ambrin, the first donor and vainest painting.
  • • Intimidation DC 14 works, but makes the next alarm harder by +2 DC.
Fail forward: On failure, the portraits still reveal the door after stealing a harmless detail from each hero's appearance, like an eyebrow color or favorite scar.

Scene 3 — The Moon Room

30 minutes

“A key made of clear glass floats inside a silver hoop. Moonlight turns inside it like water. Curator Vey stands beside the display with a velvet pistol and says, 'You are early. The city is not unlocked yet.'”

Goal: Let two heroes win through positioning, trickery, or a short duel.

What Happens

  • • The glass key cracks if it sees its reflection. Cover mirrors, turn paintings around, or douse the moon lens to keep it stable.
  • • Vey tries to stall until midnight while Glass Motes harry the heroes.
  • • Stealing the key requires one adjacent action. Escaping with it starts a chase through doors popping open and shut.

Checks

  • • Sleight of Hand DC 13 palms the key without Vey noticing.
  • • Insight DC 12 reveals Vey is terrified of breaking the key and will not risk area damage.
  • • Athletics DC 12 slams a display case shut on a Glass Mote, destroying it.
Fail forward: If Vey gets the key at midnight, every door opens. The heroes can still win by chasing him into the street, where rain reveals his invisible footprints.

Stat Blocks

Curator Vey

AC 14 · HP 24 · Speed 30 ft.

Traits

  • • Coward's Cover: while adjacent to a display case, Vey gains +2 AC.
  • • Keysense: Vey knows the direction of the glass key within 60 feet.

Actions

  • • Velvet Pistol: +4 to hit, range 30/90 ft., 7 piercing damage.
  • • Alarm Word, once: summons two Glass Motes through the nearest reflective surface.

Glass Mote

AC 13 · HP 6 · Speed 0 ft., fly 30 ft.

Traits

  • • Brittle: vulnerable to bludgeoning damage.
  • • Reflective: has advantage on Stealth checks near mirrors or glass.

Actions

  • • Shard Nick: +4 to hit, reach 5 ft., 4 slashing damage.

Rewards

  • The retired thief pays 60 gp and lets each hero keep one harmless museum oddity.
  • If they spare Vey, he becomes a useful but untrustworthy contact for future city adventures.

Scaling Notes

  • For two squishy level 1 characters, use only one Glass Mote and reduce Vey to 18 hit points.
  • For two optimized level 3 characters, add a locked balcony hazard and one more Glass Mote.