I have a player who's character is focused on disarming and tripping the enemy. So his bonuses are to the point at level five that to defend against him the enemy has to be impossibly higher level then him or trained against disarm and trip. I have made an enemy that is the second of the two possibles with a CMD high enough that a nat twenty has to auto confirm to beat it. Now the question is do disarm, trip,(the important ones here) and sunder attempts auto confirm with a nat twenty?