I don't remember ever dying on this boss but I do remember that he just did not know when to die! I was okay, but it took ages to hack away at him. I think I used Auron and Kimahri to hack off the arms with Yuna healing them. Then when the Body was exposed I just attacked it with everyone until the arms grew back. Then Auron got rid of them...then i hacked away...and it goes on....