Intellect Devourer
Intellect Devourers are a species of aberration in the Dungeons & Dragons multiverse. Frequently working alongside illithids, intellect devourers are psychic monstrosities that appear as disembodied humanoid brains running around on four little legs. They have the ability to suck the brains out of humanoid beings and then transport themselves into the now-empty skull cavity in order to use their body as a corpse-puppet. Baby Intellect Devourers are distinguished by their long, slimy tentacles, and are known as Ustilagor.