Mimic

Mimics spawn in place of chests in the world and stay still until a player tries to open one. Once opened, the mimic stands up, attacks the player with knockback, and can be defeated to recover the loot it guards. A mimic that is not opened stays disguised, and the mod notes that some mimics despawn once their contents are removed or they are killed.

Mimic is built as a vanilla enhancement that fits most existing structures in Minecraft, so chests found in ordinary exploration can turn out to be threats. The mod is meant to make looting more challenging and more exciting. A tamed mimic can be taught to follow its owner, though it teleports back if it wanders too far away. Mimic also has its own animated models with custom damage and open, close, walk and run animations.

Mimic requires Geckolib on Fabric, Forge and Quilt. Installation covers the server and each player's game. Builds cover 1.16.5 – 1.19.2 across 7 release versions, and the code is open source under the MIT License.