Potent psionic blasts. Writhing face tentacles. Purple-ish skin, slimy and cool to the touch. Extracted brains. All these things and more help define the term “mind flayer” – but what more are these aberrant creatures? What drives them? Find out within. This monster supplement provides 5 new creatures: Alhoon - a mind flayer lich Brain Golem - a stalwart ally made entirely of discarded brains Elder Brain - the center of a mind flayer community Ulitharid - a rare and highly advanced mind flayer Mind Flayer Vampire - ravenous and bestial, it requires brains and blood to survive Additionally you will find adventure seeds and a sample sept (lair) map, along with suggested random encounters.