OGC:Stunning Strike (3.5e Feat)
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Stunning Strike [Fighter Bonus, Class, Tactical, Melee Attack]
You can try to stun your enemies with a powerful strike.
Benefit: You must declare that you are using this feat before you make your attack roll (thus, a failed attack roll ruins the attempt). Stunning Strike forces a foe damaged by your attack made with a weapon with which you are proficient to make a Fortitude saving throw (DC 10 + 1/2 your fighter level + your Str modifier), in addition to dealing damage normally. A defender who fails this saving throw is stunned for 1 round (until just before your next action). A stunned character can't act, loses any Dexterity bonus to AC, and suffers a -2 penalty to AC. You may attempt a stunning attack once per day for every four levels you have attained, and no more than once per round. Constructs, incorporeal creatures, oozes, plants, undead, and creatures immune to critical hits cannot be stunned.
Special: In addition to the normal feat slot, a fighter must spend 250 XP and 2 weeks in training in order to learn this feat. A fighter who spends 500 XP and 4 weeks in training, increases the DC of the Fortitude saving throw by 2.