Like all Eidolons, Bahamut inflicts Doom on Fang at the beginning of the battle, and instead of defeating it, the player must fill Bahamut's Gestalt Bar. Bahamut is an aggressive Eidolon, initially targeting Fang with physical attacks followed by Whirlwind on the party. Libra will reveal that hitting him to get chain bonuses and switching to Saboteur to debuff him will satisfy him, as well as defending the party as a Sentinel.