This is their version of the Parry feat:
I have a player interested in this feat. Would you allow it in your game?
Pre-reqs: Dex 13+, BAB +3, Expertise
On your action, you may choose to hold one or more of your normal attacks until an opponent attacks. The opponent rolls his attack normally to determine if he hits. If he succeeds, you may then make an opposed attack roll against a DC equal to your opponent's final attack result. If you succeed, you have parried the blow and struck your opponent's weapon (PHB 136). Using parry does not provoke an attack of opportunity. If, at the end of the round, you have any unused parry actions, they are lost and may not be transferred to the next round.
I have a player interested in this feat. Would you allow it in your game?