So, I've been stuck on this boss for the past few days. It always pretty much wipes out all my characters with one hit except for Auron, usually. I guess this is because I'm underleveled, with my strongest character, Auron, having about 3,600 HP. I've tried to go and level up in the Zanarkand Ruins, but all the creatures there pretty much wipe the floor with me. Any tips or suggestions?