Board Thread:Questions and Answers/@comment-10797017-20130624101208/@comment-11051098-20130712200411

Hadô #96, Ittô Kasô, is called the "spell of sacrifice" because one has to use ones own body as a catalyst to charge the spell. And it's not even the strongest, there's 3 more levels ranked higher.

Now, if there exist spells more powerful than #99, up to #125 or higher, they would perhaps, as suggested, be so powerful that they are a threat just to charge up, like Ittô Kasô. And the destructive force would likely be devastating.