Geryon

Geryon is a exclusive Superboss in the Nintendo DS remake of Final Fantasy IV in New Game+ mode if the player manages to steal Dark Matter from Zeromus in their previous gameplay. He is known as the Four Archfiend's Malice and can only be battled in the Giant of Babil after the defeat of the four Archfiends and on Mt. Ordeals after the Giant of Babil.