Elder brain

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Origin

In works featuring illithids (or mind flayers), an "elder brain" is the core of illithid society on a local and macro scale. The elder brain lives in a pool of cerebral fluid in the center of a city; dead illithids have their brain extracted and taken to the pool - illithids believe themselves to become immortal through incorporating their personality into the Elder Brain this way. In reality, their memories, thoughts and experiences are consumed and added to the collective, while all else is lost; Elder Brains guard this secret closely, since all illithid aspire to a form of immortality through this merging process.

As the Elder Brain contains the essence of every illithid that died in its community, it functions in part as a vast library of knowledge that can be called upon with a simple telepathic call; the Elder Brain in turn can communicate telepathically with anyone in its community, issuing orders and ensuring everyone conforms. An extremely ancient Elder Brain is called a God-Brain because its psionic powers are almost limitless. Psionic potential is thus an integral part of the illithid identity, and the Elder Brain cannot absorb magical powers.

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