Ok, I'm on my second playthrough of this game, and I'm at the opera scene... and I cant beat Ultros... I am using lightning magic on him and whatnot, but I keep dying. I'm using Locke, Edgar, and Sabin. Locke is at 15, Edgar is at 16, and Sabin is at 15. (Side note: For some reason I cant use Celes's special ability other than magic... any ideas why?) Please help me out here.

~Zo