The Shadow
Hero
Dissociated mechanics! Nooooooo!!!!
If you insist. But how's it any different from the barbarian having a certain number of rages per day in previous editions?
Honestly, I don't think "times per day" is a very good mechanic for this sort of thing, I'd rather have some sort of Action Point mechanic for it, but whatever.
(You know, each class having its own distinctive Action Point tricks could be kind of cool. The fighter gets to surge, the rogue gets to reroll, other classes get other things.)