Intellect Devourer

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Intellect Devourers are a species of aberration in the Dungeons & Dragons multiverse. Created by the illithids, intellect devourers are psychic monstrosities that appear as disembodied humanoid brains running around on four small paw like legs. They have the ability to suck the brains out of humanoid beings and then teleport themselves into the now-empty skull cavity in order to use their body as a corpse-puppet.

A very similar brain-on-legs monster called Ustilagor was originally a mobile fungus that just happened to look like a brain, but got retconned as Baby Intellect Devourers in 2nd Edition. They are distinguished by their long, slimy tentacles.

Warning: If you value your eye sockets, do not kill PC's with these fuckers.