Very cool. Two nitpicks, two opinions, and a praise:
Copy error in the introduction.The Coinís Edge disciplineís associated skill is Intimidate.
Masochist's Stance doesn't really seem like a supernatural ability. More of just... a morale boost from pain?
Sadistic Blow seems too weak as it is. It would probably work better as a Boost than a Strike, I think.
Presence of the Archfiend's save DC is off. I assume it should be 16 + Cha or Int instead of 17?
Grasp of the Damned is just a really awesome idea and definitely one of my favourite maneuvers here.