V3.1: Fixes a crash bug from one of the reactions on the Temple to the Violet Flame. Save-game compatible.

The Illithid Empire mod adds illithids (also known as mind flayers) as a playable civ in Fortress and Adventure mode.

The illithids have a unique economy built mostly around the extracted thoughts of sapient species. These reactions are mostly found on new temple buildings, and are detailed below. Variants of these reactions are available to illithid adventurers. Over the course of a game, you will go from a just-barely sub-par military force to a mighty garrison, armed with weapons capable of blasting the average invader halfway across the map!

The illithid empire is composed of 10 castes; 6 different types of 'flayer, 2 different types of elder brain, and 2 slave castes. In addition, a number of other slave castes are available to the illithids as pets.

Further info can be found on the Bay12 forum post.