Bladebane

You touch a weapon that deals slashing damage and give it a deadly quality against a specific type of creature: aberrations, celestials, dragons, elementals, fey, fiends, giants, monstrosities, oozes or undead. Against the chosen creature type, the bladed weapon is treated as a magic weapon with a +2 to attack and damage rolls, as well as dealing an extra 2d6 damage on a hit.