Bahamut is a boss from Final Fantasy IV: The After Years.
Rydia must be in the party for the battle, otherwise the player will earn an instant Game Over as soon as the battle begins. A count down per five turns, Bahamut will use Mega Flare for substantial damage. The player shouldn't bother using Shell or Reflect because the Maenad will use Black Hole to remove all status enhancements. At 20,000 HP remaining a cutscene will begin; if the player possesses both the Asura and Leviathan summons, Bahamut will destroy the Maenad and return to Rydia, otherwise he must be killed and will be lost as a summon.
Bahamut (Arabic بهموت Bahamūt) originated as an enormous whale in ancient pre-Islamic Arabian mythology. Upon Bahamut's back stands a bull with four thousand eyes, ears, noses, mouths, tongues and feet called Kujuta (also spelled "Kuyutha"). Between each of these is a distance of a 500-year journey. On the back of Kujuta is a mountain of ruby. Atop this mountain is an angel who carries six hells, earth, and seven heavens on its shoulders.
Another version of the Arabic story is that Bahamut is indeed a dragon and he stands on a whale called Liwash.
In modern times, the game Dungeons & Dragons is responsible for re-imagining Bahamut as the king of dragons, a benevolent Platinum Dragon; the opposite of the malevolent Tiamat, the five-headed Chromatic Queen of Dragons.