Sephiroth is easily one of the the hardest bosses in the original Kingdom Hearts, to the point of being at least on par with the final boss, and as such a great deal of preparation is needed. First, Strike Raid, Second Chance, Dodge Roll and MP Rage are absolutely essential. If possible, equip two MP Rage, meaning, unless you chose the staff, you'll have to be at Level 66 to earn the second MP Rage. Otherwise, being above Level 55 is best. Do not equip any other special abilities like Ragnarok or Ars Arcanum. Don't equip more than one "Combo Plus" and "Air Combo Plus" abilities. Equip any other abilities to boost Sora's power like Berserk and Critical Plus. Scan is useful, as it lets you see Sephiroth's HP and know when he's about to enter the next phase of the battle, but there are other