Mimic

The mimic is a shapeshifting creature, capable of taking the form of inanimate objects, such as chests and doors. The mimic uses this feature to lure prey close. As such the form, and apparent contents, of the mimic is often chosen in acordance with it's targeted prey. A would-be adventurer might find a bulging treasure chest, proceed to open it, and find that the gold inside is changing into a writhing mess of tongue and teeth. The size and abilities of mimics vary to some degree. Some are covered in an adhesive substance, ensuring a swift death for careless looters. Most live underground or in dungeons. Some variations are cooperative and even friendly when offered food.

Source
The mimic is a creature from the D&D universe. It first appeared in the original Monster Manual.

Media
Mimics appear in the following media:

Games

 * Ancient Domains of Mystery
 * Baldur's Gate II
 * Beyond Oasis
 * Boktai: The Sun is in Your Hand
 * Castlevania: Portrait of Ruin
 * Castlevania: Harmony of Despair
 * Crypt of the NecroDancer
 * Dark Cloud
 * Dark Chronicle
 * Dark Souls
 * Dark Souls II
 * Dark Souls III
 * Delve Deeper
 * Dungeon Siege II
 * Final Fantasy IX
 * Final Fantasy X
 * Final Fantasy XI
 * Final Fantasy XII
 * Final Fantasy XIV
 * Flight Rising
 * Gems of War
 * Golden Sun
 * Khimera: Destroy All Monster Girls
 * Mabinogi
 * Nethack
 * Nox
 * Torchlight
 * Vandal Hearts
 * Khimera: Destroy All Monster Girls
 * Mabinogi
 * Nethack
 * Nox
 * Torchlight
 * Vandal Hearts
 * Nox
 * Torchlight
 * Vandal Hearts
 * Torchlight
 * Vandal Hearts
 * Torchlight
 * Vandal Hearts
 * Vandal Hearts