 It is explicitly stated in this book that the illithids appear in some of the most ancient histories of the most ancient races, even those that have no mention of other races.The 3.5 Edition "D&D" supplement "Lords of Madness" provides that the Illithid were a star-faring people who existed at the end of time.Facing annihilation, the Illithid traveled to the past, arriving roughly 2000 years before the present in any given "D&D" campaign.