Hmm... Olympia=Good, Abilities=Good, Equipment=Possible Problem. You should have 2 Thunder/ara/aga Rings by now. Equip them both. At the end, don't wait for him to go out of blue berserk, it's not gonna happen. Jump and Slash during that period. Combos work well while he's chasing you (not berserk) and you can Guard those energy blasts back at him to stun/damage him. Good luck.