Shadowlord Lucifer of Gehenna, also known as the Digital Mutate Lucemon, is a supporting antagonist in the Kingdom Hearts Unlimited Saga, appearing in "Return of the Keyblade" as one of the major bosses of the return trip to the Digital World.
One of the two major fragments of the Great Evil residing in the Digital World, Shadowlord Lucifer is a monstrous draconic beast who is prophesied to bring about the end-days of the United Universes with its brothers-in-arms. Mindless, savage, and ruthless, the Shadowlord wanders about the endless wastes of Tartarus, carrying with it the sphere of Gehenna, said to be a prison for the souls of the truly wicked that even Tartarus will not hold. The Shadowlord's fragment of the Great Evil represents the Sin of Omnicidal Nihilism, being so utterly mindless and uncaring in its path of destruction that no one is spared from its destructive wake.