Here's my version:
Wicked
A Wicked weapon is one forged with the magic of wounding. Magic used in the forging process alters the weapon in such a way that it tears flesh to devastating effect.
A Wicked weapon inflicts an extra 1d6 damage of the weapon's type on a successful hit. On a critial hit, the weapon inflicts an extra 1d10, plus 1d10 per critical multiplier level over 2 (e.g., a greatsword would inflict 3d6 per hit, and 4d6+1d10 on a critical, while a greataxe would inflict 1d12+1d6 per hit, and 3d12+2d10 on a critical).
Caster Level: 10th; Prerequisites: Craft Magic Arms and Armor, Harm or Finger of Death; Market Price: +3 bonus.
-- Nifft