Baneful (3.5e Equipment)
From D&D Wiki
A baneful weapon is forged in the utter hatred and malice towards a particular type or subtype of creature. It functions as a bane weapon but deals 3 times the damage of a normal version of the weapon to its chosen foe. The damage for the weapon is rolled normally than multiplied by 3. Only the damage value of the weapon and not the additional 2d6 points of damage is multiplied. It cannot harm any other creature besides its hated enemy. Bows, crossbows and slings bestow their hatred upon their ammunition.