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In the role-playing game Dungeons & Dragons, illithids (also known as mind flayers) are semi-humanoid beings with an octopus-like head with psychic powers that often live in moist caverns and underground cities. They capture cave dwellers and other creatures living underground such as drow and dwarves, using them as slaves and as a food source, much like cattle. Illithids believe themselves to be the dominant species of their world and thus they have no problems with treating any creatures or humanoids quite cruelly, should the need arise. Mind flayers have four octopus-like tentacles around their beaklike mouths, and require the brains of sapient creatures as part of their diet. A mind flayer who snares a living creature in all four of its tentacles can extract and devour its living brain. Mind flayers often possess magical abilities in addition to their psychic powers, and are often able to penetrate illusions. One of the most feared powers is the dreaded Mind Blast, where the Illithid sends out a cone shaped psionic shockwave to incapacitate any creature with a mind for a short amount of time.

Mind flayers also appear in some roguelike games, including Angband and Nethack. These games are mostly based on D&D, but use slightly different names and rules to avoid copyright problems. The mind flayers themselves were originally inspired by the Spawn of Cthulhu, creatures from the Cthulhu Mythos.

Illithids are ruled by creatures called Elder Brains- when an Illithid dies its brain is extracted and taken to a special pool in the center of the city, where the fused brain tissue of every Illithid who has ever died floats. Due to their psionic nature, the brains are still "alive" and have in fact amalgamated their intellects together to form a gestalt conciousness. This Elder Brain is the city's leader, and the pool where it floats is also where the Illithids deposit their spawn/tadpoles- despite the fact that the Elder Brain can and often does devour the larvae. An extremely ancient Elder Brain is called a God-Brain, because its psionic powers are now almost limitless.

Illithids rule an Island of Terror in Ravenloft called Bluetspur, where their God-Brain is actually directed by the mind of a human psionicist.

Dungeons & Dragons creatures

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