The game wants you to break it. Some of the late game bosses are so over the top you need the broken maelle build just to have a chance.

Simon? I mean, you could one-shot him in both phases, but I doubt he was designed with that in mind. There are videos on YouTube where people beat him legitimately (as in, don’t skip the entire fight by not letting him do a single turn), after all.

Myself, I resorted to doing the entire third act, side-activities included, the easy way, but that’s because I’m bad at dodging and parrying and not patient enough to retry the same fights over and over again.