Wicked Weapon
Weapons with this magic ability cut deeper and inflict greater wounds than other weapons of their type. They even seem to sense weakness and inflict greater wounds on those who are weak.

Weapons with this enhancement improve their damage die by one step. Further, any weapon damage rolls (except precision damage) made against a flat-footed opponent, or on a critical hit, allows any die that comes up a “1” to be rerolled once.

Aura moderate transmutation; CL 7th; Craft Magic Arms and Armor, cat’s grace, true strike; Price +6,000 gp (or +1 bonus for a weapon with a base damage of 1d12/2d6 or higher).