Return of the Dark Sorcerer

Well I'm at a loss for how you're even supposed to survive it. I'm positive I Defended and it still did 4000-5000 damage. Does it completely ignore defense too, like Shell? Had that on, too.

Nobody in my party has more than 3300 HP. That's Level 35 Arc and the rest of my team - Level 39 Aurora,Level 36 FuSoYa and Level 33 Oboro - haven't even reached 3000 yet.

Unless I'm jut not supposed to fight him until way later. I can put this off for now and go do other things.