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Version 0.29: This article may not be up to date for the latest stable release of Crawl.

Mimics are mischievous entities which harmlessly toy with passing adventurers. They disguise themselves as shops, and in certain areas, items - most notably the rune of Zot in Vaults:5. However, once you come within a one-tile radius of them, they will "vanish and cackle," disappearing from the game forever. Mimics are most often harmless, though a mimic rune may lead to hazardous situations.

To clarify, mimics are not monsters, and cannot be killed in any way.