Ryōma Itō artwork of the Esper Bahamut from Final Fantasy XII: Revenant Wings. As in most Final Fantasy games, the Revenant Wings version of Bahamut is the most powerful summoned creature. While Bahamut did not appear as an Esper in the original Final Fantasy XII, in Revenant Wings he is a deadly power serving the forces of evil in the main story capable of destroying entire floating islands. After being summoned by the Judge of Wings Bahamut shatters The Muruc Cahuac Skysea into three smaller islands. Bahamut later fights for Feolthanos during the Final Boss fight of the game.
Like all summons though, Bahamut merely serves the wishes of his master. The Esper can be obtained by the player in side mission 79 Wings of Midnight, after defeating a difficult gauntlet of strong Espers. At that point Bahamut will join Vaan's Ring of Pacts to be used by the player.
The design of Bahamut in Revenant Wings is unique in that this version is very humanoid, standing up-right similar to his appearance in Final Fantasy X. He wears armor and uses a spear as a weapon, making him appear vaguely Dragoon-like in appearance. Ryōma Itō's design is a striking and elegant form.