I have finally made it to the final boss of the game, and it is one the toughest fights I've ever had in any FF game. I've been at it for three hours now but everything I've tried is futile. He either keeps killing me instantly when I'm paralyzed or his sword keeps murdering me nonstop. I rarely get chances to attack him because I'm always focused on trying to keep my party alive. He heals himself constantly and my Aeons can only do like one overdrive until he kills them. I'm pulling my hair out at this fight, considering I had no problem with Yunalesca and Seymour's 4th boss fight. I need help.