Intellect Devourer

Intellect devourers resembled walking brains on a set of bestial legs. They were servants of the mind flayers and took over their victims' minds on their behalf.
Illithids bred intellect devourers by subjecting the brain of a creature (usually a thrall) to a ritual in which the brain started sprouting legs. During this process, the newly created aberration passed through a larval form called ustilagor (ustilagors were the larval stage of the development of intellect devourers) before reaching its final adult form.

Scientific Name

Aberration