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Or Ultima, if you've synthesized that one...this fight i remember was tricky for my first time. dodge roll will really help, but also try gliding when in doubt. avoid making close contact too much, and when the moment is right, strike! use your magic only for curing and make sure you're packed with hi-potions and elixirs. your strongest keyblade should be used, for me i believe it was the Oblivion.