Sap Adept (Feat)

You know just where to hit to knock the sense out of your foe.

Prerequisites: Sneak attack +1d6

Benefit: Whenever you use a bludgeoning weapon to deal nonlethal sneak attack damage, you gain a bonus on your damage roll equal to twice the number of sneak attack damage dice you rolled. Namely, all non-lethal sneak attack damage is rolled as 1d6+2.