Copied this from a walkthrough:
This one is more annoying than anything else. You see, he can heal himself,
but he only can do this if he has his arms, and you know what that means?
Right! Hit his arms quick and hard, all the usual - Flying Tenseiken,
Dragon Raise, Beast-King Smash and Fallen Wings (maxed out preferably). To
quickly deal with each hand use only the moves that effect one enemy. Kill
one arm, then another. And without his arms his pathetic. He won't be able
to heal, he'll use his Piercing tale and cast the Avenging Claw, now that's
what you should watch out for. His Claw can do a whooping 800HP damage, so
if he damaged some one your character or characters then heal with
Alhealer. When there's only his body left, you'll probably be out of SP,
however your MP should fine. So to finish his body use your most
destructive magic and if someone doesn't have powerful magic you can even
use simple Combos.