You are a particularly dangerous opponent to duel.
Prerequisites
Combat Expertise, Improved Disarm, Weapon Focus, Weaponmaster path class feature, manifester level 10th, base attack bonus +6.
Benefit
The competence bonus from your Weaponmaster trance now also applies to damage rolls made with a weapon (natural attacks do not count for this purpose). In addition, when using the Weaponmaster maneuver, you can choose to make a free disarm attempt against your attacker in place of the single melee attack. If your disarm attempt is successful, you may then make a single melee attack against your opponent in place of the 5-foot step.