User blog comment:IamJakuhoRaikoben/Chapter 455: Magnolia's Defensive Battle, Review./@comment-24546844-20151005142615/@comment-7418318-20151005160213

The theoretical problem is that the body and the magic are so out of synch that one damages the other.

That can be due to too much magic in a normal body, or a normal amount of magic in a too fragile body, a combination of both or anything in between.