The Devil (魔王, Maō, lit. Devil) is a mutated Phantasma that participated in The Great War. It created the Demonia race in a failed attempt to create more Phantasma. Without the Devil, the Demonia wouldn't be able to band together due to their instincts. Sora was frustrated that most information was contradictory about the Devil.
- During the Great War Simulator game, Sora's meddling caused the Elves to attack Demonia and hunted their orcs to near-extinction. Seeing the misery of his creations, the Devil intervened and caused great loss to the Elves. However, the tables were soon turned when the Elves unveiled Aka Si Anse, the ultimate anti-Phantasma weapon.