In Kingdom Hearts II, Sephiroth returns as secret boss battle in Hollow Bastion. Previously, in the Original Kingdom Hearts, Sephiroth was only accessible in the Olympus Colliseum, but in Kingdom Hearts II, Sephiroth is only available in Hollow Bastion or Radiant Garden. Most strategists expect you to be at a level 80 or above, which is absoultely NOT the case in this strategy. This guide isn't a end all answer, Oh meh gawd, defeating guide. Plain and simple, if you know how to play Kingdom Hearts II, and you don't suck, and you aren't a n00b, then you can beat him at level 40 and lower. Plainly, it just relies on how well you can play the game. As well, there isn't any real answer and difference on Sephiroth in Proud or Normal mode, again, he won't be hard if you don't suck. First off, you have to be certain complete ammount in the game. First off, you have to be at 'The World That Never Was.' Or past that part, which is already beaten the game. From there, return to Radiant Garden, and go to the Dark Depths; Where you fought the One Thousand Heartless (1000 Heartless). A Cutscene will appear and his voice acting will suck and you'll start the battle.

Before you battle, make sure you have at least these stats or lower. Equiped, at least Holy Pumpkin Keyblade, you can go with the Ultima Weapon if you have it but it's not neccessary. Or you can go with Oblivion. Have some good abilities, Second Chance etc. This guide won't go into detail on what you exactly need but it's good if you have some protective Abilities. Make sure you know that Sephiroth will start off using a combo which he will direct at you, Block and then start the battle. Make sure you try to stay airborne more often, however, big and flashy combos will not be needed to beat him, use basic attack, block with the reaction block command when he attacks. As well, make sure you jump then attack him, it's the easiest way to effectively block and attack him with ease. Win. Recieve Fenrir. However once you beat him, you cannot fight him again, which is the sad part.