Snake Style

Combat Style

You watch your foe’s every movement and then punch through its defense.

Prerequisite: Improved Unarmed Strike, Acrobatics 1 rank, Sense Motive 3 ranks.

Benefit: You gain a +2 bonus on Sense Motive checks, and you can deal piercing damage with your unarmed strikes. While using the Snake Style feat, when an opponent targets you with a melee or ranged attack, you can spend an immediate action to make a Sense Motive check. You can use the result as your AC or touch AC against that attack. You must be aware of the attack and not flat-footed.

Normal: An unarmed strike deals bludgeoning damage.

Source: Ultimate Combat