 Worlds ruled by illithids in other spheres include Falx, Ssirik Akuar, Penumbra, and Glyth.Illithids are the rulers of a domain in the "Ravenloft" campaign setting called Bluetspur, where their God-Brain is the darklord.How and why this particular Illithid elder-brain became a darklord has never been revealed in any official Ravenloft products.