Daelkyr

The daelkyr are the lords of Xoriat, the Realm of Madness. They are immortal and immensely powerful, and have legions of beholders, mind flayers and other kinds of aberrations at their command. Like the quori before them, they tried to invade Eberron 9,000 years ago, but ultimately failed and have been trying to trying to get Xoriat coterminous with the material plane ever since. It is rumoured that several daelkyr still inhabit the world in the deep depths of Khyber.