Glabrezu are huge humanoid demons averaging 9 feet tall and weighing about 1,500 pounds. They have dog-like heads with vibrant violet-purple eyes, bony pincers where a normal humanoid would have hands, and a smaller set of human-like arms with ordinary hands protruding from their chests. Their wrinkly, cracked skin ranges in color from a deep brown to pitch black.

Glabrezu prefer to tempt victims into ruin, not unlike succubi, but glabrezu lure their prey with offers of power or wealth rather than passion. Preferring subterfuge to combat, these enormous demons attack with a vengeance if their attempts to entice or deceive fail.