Euh ... je ne me souviens plus vraiment du boss, et je me souviens encore moins avoir eu des difficultés ...
Voilà une technique tirée d´une FAQ de gamefaqs :
Boss Strategies:
This is another rather challenging boss, he has a lot of Hp and Mp, as well as
some powerful attacks. He is capable of summing a giant spirit who will Mp kill
any characters who are close to him him immediately, so it´s a good idea to use
a long lange spellcaster like Sophia, or long range attacker like Maria so
someone can be left to revive everyone. Cancel bonus´d Ethereal Blast will help
rack up the damage needed, but it´s frustrating to get it off here before he
interrupts with a sword attack.