Axiomatic Strike( Player's Guide to Faerûn, p. 135)
Your attacks deal incredible damage to chaotic creatures.
any lawful alignment, Smite anarchy class feature,
Any weapon you wield is treated as an axiomatic weapon (lawful-aligned, deals an extra 2d6 points of damage against creatures of chaotic alignment). If the weapon already has an alignment, this feat has no effect on it.