I couldn't finish 'em. Looks like this's gonna get complicated.
Bahamut has several attacks that deal physical damage, such as Critical, Rend and Claw. His counter attack, Devil Claw, dispels the target and inflicts damage. Flare inflicts major magical damage to one target, while Tri-Breath, which deals less than Flare, inflicts damage to all allies. His most threatening attack cast only after Bahamut is finished counting down, is Mega Flare. The signature move is twice as powerful as Tri-Breath and guarantees to knock out any low-HP character without Shell.
Bahamut doesn't start attacking after he uses the first Mega Flare, which he uses after he has finished his count down. Casting Shell, Protect and Haste as soon as the battle start is essential. The player should have at least two healers to keep the party's HP high as Bahamut is a powerful foe, or rebuff anyone who is hit by Devil Claw, probably by using Alabaster Veil. His attacks deal raw damage and no negative statuses, except for Rend, so the healers must be kept alive. The others should focus on bringing Bahamut down quickly with powerful F-Abilities, such as Phantom Rush, Final Heaven or Midareyuki.
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.