Thunder 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. Later he appears as a random encounter in Pandaemonium's secret room. The Thunder Gigas is the most difficult of the three elemental Gigas encountered in the Mysidian Tower, and after six floors of random battles wearing at the party, he may pose quite a threat. The Thunder Gigas will follow the same attack pattern as the Fire Gigas and Ice Gigas, with occasional Thunder 16 and Boulders 9 magical strikes mixed in amongst a torrent of physical strikes. Due to the creature's very high Attack stat, the party may suffer some KOs. Thunder Gigas is weak against the Poison element.