User blog comment:Lolipoop/Why is this possible?/@comment-5475313-20161222041919

He's supposed to use "True Holy World" regardless of whatever happens in the third phase. But if you used 3 UBBs, he should let you live with 1 HP on each of your remaining units when he executes that attack. <--  This is how my battle with that bastard ended, but I have heard stories that people have died even with doing what they were supposed to do.