This creature resembles a disembodied human brain that has sprouted four short, clawed legs.
AC 24, touch 19, flat-footed 17 (+7 Dex, +5 natural, +2 size)
Str 8, Dex 24, Con 21, Int 16, Wis 10, Cha 17
Environment any underground
Body Theft (Su) As a full-round action that provokes an attack of opportunity, an intellect parasite can reduce its size, crawl into the mouth of a helpless creature, and burrow into the victim's skull to fuse with its brain. The intellect parasite usurps control of the creature's body and may use it as its own, as if it controlled the target via a dominate monster spell. The intellect parasite has full access to all of the host's defensive and offensive abilities save for spellcasting and spell-like abilities (although the intellect parasite can still use its own spell-like abilities). As long as the intellect parasite occupies the body, it knows (and can speak) the languages known by the victim and basic information about the victim's identity and personality, yet has none of the victim's specific memories or knowledge. Damage done to a host body does not harm the intellect parasite, except for poison, which affects the intellect parasite and host equally. If the host is slain, the intellect parasite emerges and is dazed for 1 round. If the intellect parasite is slain while the host lives, it is ejected from the host's body.