Archdemons are the Old Gods manifested in the form of powerful and terrifying dragons and tainted by darkspawn.
Archdemon (formerly Bullwong, Winged Demon, ArcDemon, Arc Demon and Arch Demon) is a monster who appears in the Dragon Quest game series.
Archdemon is the name given to the inhabitants of Hell, after eating it's Fruits. When Gabrielle fell into the Pits of Hell, Callisto forced her to eat it and she turned into something resembling Callisto, who had already been transformed into an archdeacon.