So if my fighter takes the 'disarming strike' feat (or something similar), and gets the 'weapon mastery' fighter class feature at level 20, will crits with the chosen weapon always disarm? And, would it stack with, say, 'stunning critical'?
When you crit you can apply one feat that triggers as a rider there is a fighter feat (critcal mastery) that allows you to apply two critical feats instead of just one.
As to auto disarming I believe you would roll a confirmation roll to compare to their CMD. It doesnt say that you get a natural 20 on the confirmation roll just that you auto confirm(as in no roll needed.)
Thanks much!