Merciful Strike
( Complete Scoundrel, p. 79)[Ambush]
You can strike a creature's vital areas without killing it.
Prerequisite
Benefit
Your successful sneak attack deals nonlethal damage. When using this feat, you can ignore the usual -4 penalty on attack rolls for attempting to deal nonlethal damage with a lethal weapon. Using this feat reduces your sneak attack damage by 1d6.