Bidiel is a demon and wandering duke of the air. Bidiel commands 20 dukes and 200 lesser dukes, plus other servants. The dukes change their offices and locations every year. They appear in the form of beautiful humans and are willing to obey an Exorcist. The 10 great dukes are Mudiret, Cruchan, Bramsiel, Armomiel, Lameniel, Andruchiel, Merasiel, Charoblel, Parsifiel, and Chremoas.