In the Dungeons & Dragons fantasy roleplaying game, the intellect devourer is a type of fictional monster for player characters to encounter.
The intellect devourer first appeared in the original Dungeons & Dragons game supplement Eldritch Wizardry (1976).[1]
The intellect devourer appeared in first edition Advanced Dungeons & Dragons in the original Monster Manual (1977).[2] The ustilagor first appeared in Dragon #69 (January 1983), and then reprinted in the original Monster Manual II (1983).
The intellect devourer and the intellect devourer larva (ustilagor) appeared in second edition in The Complete Psionics Handbook (1991),[3] and reprinted in the Monstrous Manual (1993).[4]
The intellect devourer appeared in third edition in the Psionics Handbook, and its 3.5 revision the Expanded Psionics Handbook (2004).[5] The battle intellect devourer appeared in Dragon #303 (January 2003). The ustilagor appeared in Dragon #337 (November 2005).
The intellect devourer and ustilagor appeared in the fourth edition in Monster Manual 3 (2010).
An intellect devourer is a chaotic and evil monster, highly malign with regard to sentient life. It dwells deep beneath the ground, and subsists on the psychic energy of its prey.