Concussion Attack

(Complete Scoundrel, page 75, DnD 3.5)

[Ambush]

Your attacks can damage your opponent's ability to think clearly.

Prerequisite

Sneak attack +3d6

Benefit

Your successful sneak attack imposes a -2 penalty on the target's Intelligence and Wisdom checks, as well as on any Intelligence- and Wisdom-based skill checks, for 10 rounds. If you use this feat a second time on a target before 10 rounds have elapsed, the effect of the first use expires. Using this feat reduces your sneak attack damage by 2d6.