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Exotic, light melee weapon. 5 or more ranks in Sleight of Hand while using a barbed dagger gives a +2 bonus on damage rolls on any successful sneak attack made with the weapon as it twists in the wound. This bonus also applies (and is therefore doubled) on successful critical hits with the weapon.

Characters proficient with the barbed dagger can treat it as a dagger for the purpose of any of the following feats: Greater Weapon Focus, Greater Weapon Specialization, Improved Critical, Weapon Focus, and Weapon Specialization.