The Asetem-Ankh-Astet (asetem, for short) are a type of vampire that descended from Astet, "the priest who died, yet lived." (Vanished, p. 174.) Their numbers are limited and they differ from "normal" vampires in looks and diet. According to the goddess Sekhmet, in general, the asetem have "fine white skins and cobra forms." (Vanished, p. 174.) They do not feed on blood, but instead on ka--the soul of humans. In essence, they are psychic vampires.
The Asetem-Ankh-Astet are led by Wygan, the Pharaohn-Ankh-Astet.