Are you strong enough to defeat me?Bahamut
Bahamut is first encountered on Dragon's Peak towards the beginning of the game, bringing the party to its nest and feed its sons. It is much too strong for the party to defeat. In the 3D versions, even through using cheats one can only defeat Bahamut using a one-hit kill cheat, as all other attacks only do one damage, and Bahamut will have killed the player long before the player kills Bahamut.
The player can visit Bahamut's Lair later on after acquiring the Invincible to defeat and obtain Bahamut. It is possible, through cheats or grinding, to defeat Bahamut at Dragon's Peak; however the player would not be able to challenge him at Bahamut's Lair later, and so could only acquire his summon by buying it at the secret shop in Eureka.
Bahamut's two actions per turn sometimes include the powerful spell Megaflare, which deals enormous damage (1000 or more) to the entire party. Since Bahamut is an aerial opponent, it has a weakness to the Wind element.
3D version battle
Before saying "Yes" to Bahamut, the player should have at least one Dragoon and one Scholar, two Dragon Lances (purchasable in the Invincible), and at least one Chocobo's Wrath (one is found in Bahamut's Lair). It is recommended to be at least level 42 with all characters. Any other jobs are optional.
The other two jobs should attack physically, unless one or more is a high Intelligence job, which should use Chocobo's Wrath/Flare to deal 3,000–4,000 damage to Bahamut. A Devout/White Mage with Aeroga or a second Dragoon would be helpful, albeit a little more costly. A high job level Monk/Black Belt and Thief/Ninja may deal within the 2,000–4,500 Damage to Bahamut as well.
The player should have their Scholar use a Chocobo's Wrath to cast Flare on Bahamut. The Scholar's high Intelligence stat and Item Lore effect should deal 7,000–9,000 (depending on job and character level). Next turn, the Dragoons will land on Bahamut for 5,000–9,999 damage (depending on job/character level). The Scholar should use another Chocobo's Wrath and Bahamut should fall within two turns.
As another strategy, with a party of a Dragoon in the party, a Knight, a White Mage, and Black Mage, the player should keep the Knight protecting the White Mage, who will heal while the Dragoon uses Jump and the Black Mage uses high level magic. The Knight can use all items found in Bahamut's Lair. The Dragoon should equip Wind Spears or better, and the White Mage should cast Aeroga if available. It is advisable to have defeated Odin and Leviathan before attempting to battle Bahamut.
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.