An Ancient Demon Lord is a type of Demon from Heck and Fire-elemental Monster fought in Knight Class, quest nine of the Advanced Demon Knight. Only their kind, the oldest of Demon Lords, wield the power of ancient demons and are the only ones capable of imbuing that power inside of others. However, they began to disappear because of old age, until Queen Tyranna of Stormfallen sealed some of them off in a dimension outside of time and space, so that they might never grow old and die (Knight Class).