There's no monsters in this room but just a convenient pile of treasure? This set includes a Pile of Equipment (Mimic in hiding), a Malignant Mimic Monstrosity, and a Suspiscious Chest.
Basic Cavern Set - Standard Walls and Floors - Painted
3-Piece Cavern Sample Pack
Lava River Pack - Painted
Water Cavern Open Water Tiles - Painted