You can strike a creature’s vital areas without killing it.
Prerequisite: Sneak attack +2d6.
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.
Source: Complete Scoundrel, page 79.