Pharaoh's Fist

 
Prerequisite(s): Str 15+, Improved Unarmed Strike, Improved Initiative, Stunning Fist
 
Benefit: You must declare the use of this feat before your attack roll. By using a stunning fist attempt, you force an opponent you hit as well as any creature adjacent to it to make a fortitude save vs DC = 10 + 1/2 char level + Wis modifier or be stunned for 1 round. This feat can be used once per round.
 
Source: Sandstorm