Bahamut's Mega Flare pierces reflect spells altogether. Mega Flare is weak, so with proper buffs and high-enough levels, the party can survive it.
A useful strategy is to quickly cast Slow on Bahamut, and have Rosa and Fusoya cast Haste on the party, then Berserk on Cecil and Edge, unless Cecil is equipped with the Avenger sword. After Haste has been applied, have one of the primary magic users cast Hastemarch with Bardsong, which should give the main attackers near instant turns. Bahamut should fall before he even gets the chance to use Mega Flare once.
If the player waits until after returning to Earth, they can return later and defeat Bahamut using only Kain's jump attack. Bahamut will count down from 5 to 1 before casting Mega Flare and the player will be able to jump with Kain twice per countdown, once after 5 and then again after 1. As long as Kain jumps after Bahamut counts 1, he will be in the air when the spell is cast and will not take damage. However, if Kain is the only one alive and in the air, Bahamut will not bother to cast Mega Flare. Once Kain comes down from his jump the count starts over at 5. Depending on Kain's level, the player can defeat Bahamut fairly quickly without using any magic or items.
Related enemies Edit
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.