Fire Gigas

It serves as one of the bosses in the Mysidian Tower, guarding the spell Ultima. Firion, You and his allies must defeat it on their way up the tower. It later appears as a random encounter in Pandaemonium's secret room. Fire Gigas, as the first of three similar creatures encountered as the party ascends the Mysidian Tower, is the easiest boss fight in the dungeon. Despite being categorized elementally, still prefers physical bombardment to magical assaults. It can cast Fire 16 on the party, and may occasionally single out one character to cast Boulders 9 on, but the main concern will be his constant physical attacks.