I really dislike that instant power ups. It makes no sense. And what about their ability to determine how strong they are. Nowhere could see a person who could easily guess how much they can lift without ever trying that.
How can't it be "no sense" ? This time it was the supposed Emperor undead cores after fusion of 3 other undead cores.
Don't he need some martial technique ? Why doesn't he try to ask from the white hair guy ?