smackababy
Lifer
Gotta get a preemptive attack then keep them juggled until they're dead.
That is what I did and I got him to around 15% health. Then my stagger ran out, he stood up, and destroyed my team. He healed up to full, I summoned Odin, he killed me, Odin revived and left, then he one shot the party...
I did end up skipping a lot of battles, so I might be behind in the leveling.