Quote Originally Posted by Ferrinus View Post
Technically Flare doesn’t supersede Aspect Mastery because, if you are in Umbral Ice III and have 0 MP, you will still be able to cast Flare (where normally you would need at least 400 MP in the tank to throw a cold flare). It’s just that as soon as it resolves, Flare will gobble up any MP you managed to regenerate during its cast time.
I just tested this.

You cannot cast Flare with 0 or 400 in UI3, UH present or not.

Flare supersedes Aspect Mastery, and that's fine. It costs 100% or 66%, minimum of 800 MP, independent of your stance.