Whereas the succubus is a demon that works her wiles by exploiting the physical lusts and needs of her prey, the glabrezu is a tempter of a different sort. Ferocious and bestial in form, the glabrezu is in fact a master of trickery and lies. With its ability to cloak its true form in pleasant illusions, the glabrezu uses its magic to grant wishes to mortal humanoids as a method of rewarding those who succumb to its guile and deceit. A wish granted by a glabrezu always fulfills the wisher's need in the most destructive way possible—although such methods might not be immediately apparent. A struggling weaponsmith might wish for fame and skill at his craft, only to find that his best patron is a cruel and sadistic murderer who uses the weapons to further his destructive desires. A lonely man who wishes for a companion might have his wish granted in the form of a lost love returned to “life” as a vampire, and so on—the glabrezu is nothing if not creative in addressing a mortal's desires.

A glabrezu stands 18 feet tall and weighs just over 6,000 pounds. These treacherous demons form from the souls of the treasonous, the false, and the subversive—souls of mortals who, in life, bore false witness or used treachery and deceit to ruin the lives of others.