Vault of the Sundered Keystone

Buried in the damp lower galleries of an old watchwork dungeon — long since emptied of its original guardians — the party uncovers a sealed side vault behind an overturned statue. No beasts or current occupants remain; instead the vault contains the spoils of several long-ago expeditions: trade goods, craftsmen's stores, a cache of coins, and a few arcane curios that suggest a small cadre of dungeon-savvy artisans once used this place as a hidden workshop. The items are a mix of mundane value and useful adventuring gear, with a single uncommon magical trinket likely left behind by a careless apprentice.