Bahamut ( Final Fantasy IV boss ) Bahamut is a boss in " Final Fantasy IV " , but cannot be challenged until you have defeated Leviathan . Defeating him earns Rydia the Bahamut summon . Strategy . It is best to enter this battle when Fusoya first joins the party and not after having gone back to the Overworld and switch him for Kain . Rosa and Fusoya should cast Reflect and other members use any items to cast walls . It is best to cast Reflect on Fusoya and Rydia first , and then cast it on members with the lowest HP . When Bahamut uses Megaflare it will Reflect back onto him . The Reflect wall will only last two uses of the Megaflare , then the player must re - cast it . Recasting it when the Reflect wall is still up will cause it to bounce to Bahamut . It is possible to win the battle by simply allowing Bahamut to kill himself , applying magic only to the player party . If the party has no Reflect items or Fusoya , winning is harder . Before the battle the player should kill all party members but two , Rosa and another character . This is needed because Rosa is usually the last to take her turn , so by killing off two characters Rosa will definitely get a turn in before Bahamut uses Megaflare and can cast Reflect on herself . If the other member survives Megaflare , Rosa should cast Reflect on him , if not , just leave knocked out . When Bahamut uses Megaflare again , Rosa should re - cast Reflect . The player will still win as Bahamut will kill himself . GBA Strategy . The above does work and Porom would also be recommended for she can also learn Reflect , like Rosa and Fusoya . Rydia or Palom can help by casting either Tsunami or Quake , but another impressive feat would be to take Bahamut out with one character - Kain Highwind . Kain should Jump at Bahamut right between the count of 3 and 2 and he will land right after Bahamut casts Megaflare . The player does not need to bother to revive the other members , as they will not survive most of the time . Eventually , Kain will be able to take Bahamut out . 3D Strategy . The strategy of casting Reflect is useless in the DS remake , as Bahamut ' s Mega Flare pierces reflect spells altogether . Mega Flare is much weaker than previous versions , so with proper buffs and high - enough level s , 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 right 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 .