SRD:Backstabber

Backstabber
This +6 short sword adds +2d6 to the wielder’s sneak attack damage. If the wielder does not have the sneak attack ability, this weapon does not grant it.

Caster Level: 21st; Prerequisites: Craft Magic Arms and Armor, Craft Epic Magic Arms and Armor, inflict moderate wounds; Market Price: 770,310 gp; Cost to Create: 385,310 gp + 17,700 XP.