Bahamut

Bahamut, also known and referenced as the Dragon King, or the King of the Espers, is an esper in Final Fantasy XVI'. 'He is the leader and current King of the Espers in Olion, whose power has been shared and evenly distributed among the other espers in the heavens. He is responsible for creating the multiple Olions in order to stop Tenebris's rule.

In the sixth Olion, Bahamut watched an individual, Vizian Izara, grow mad while pressured by his inability to save his lost and fallen comrades. Overtime, Bahamut grow soft and transferred his abilities to him, becoming part of him through a massive esper orb known as the Tower of Nodessa. He becomes a hidden true antagonist near the end of Final Fantasy XVI.

Vizian Izara is currently in possession of his power. He offers the power to alter reality, memories, and change destinies. His most powerful ability, Mega Flare and Dark Flare, is a massive beam attack that decimates foes within its path.