Vault 73-B: The Mimic Vault

Location: Kigum (The Grand Arcane Bank) Level Range: 7-8

Background & Objective

A secure vault within the Grand Arcane Bank has been "compromised" by a biological security failure. The localized reality field intended to deter thieves has malfunctioned, turning every piece of furniture, door, and even floor tiles into aggressive mimics. The bank needs a specialized team to clear the vault and retrieve a plain wooden bucket containing highly sensitive diplomatic documents.

The Gimmick: Paranoia Induction

The vault's security system creates a localized field that makes inanimate objects appear as Mimics. Real Mimics are also present. Players must use "True Sight" or physical testing (hitting things) to navigate the deceptive environment.

Tactical Combat & Challenges

• Mimic Colony Battle: A showdown where the floor tiles are mimics (applying the Grappled condition), the door is a mimic, and even the "treasure chest" is a mimic.
• Deceptive Layout: The real treasure is intentionally hidden in a mundane-looking plain wooden bucket, which is the only object in the room that isn't a mimic.

Narrative Outcomes & Loot

• Success: The documents are retrieved, and the bank rewards the party with specialized storage items.
• Huge Throbbing Treasure: The Gilded Gastropod, a golden snail shell that acts as a Bag of Holding but can also cast Leomund's Tiny Hut once per week. Contains 5,000 GP in assorted gems.