 As with most (not all) boss fights, it's mainly a matter of surviving incoming damage. If you need an ultimate skill to help you do so in the final part of the fight, so be it; after a couple of tries, you should find it pretty easy to recognize when that phase starts.
 As with most (not all) boss fights, it's mainly a matter of surviving incoming damage. If you need an ultimate skill to help you do so in the final part of the fight, so be it; after a couple of tries, you should find it pretty easy to recognize when that phase starts.