Nerve Strike(General, Fighter)
Prerequisites: Improved Unarmed Strike, base attack bonus +9
Benefit: You have learned to make a debilitating nerve strike with your unarmed attacks. Make a single attack roll as a full-round action. If the attack inflicts damage, the target must make a Fortitude save (DC 10 + half the damage dealt after DR) or become nauseated.
A creature affected by your nerve strike may make another Fortitude to shrug off the nausea every round at the end of its action. The Difficulty Class of the check falls by 2 for every round that has passed since your made your nerve strike.
If a creature that is already suffering the effects of a nerve strike is struck by another nerve strike, the effects of the first nerve strike immediately cease. The creature must immediately make a Fortitude save against the new Difficulty Class inflicted by your nerve strike. Note that this means that if an ally is suffering from the effects of a nerve strike you could deliberately nerve strike him for minimum damage and potentially reduce the DC of his ongoing Fortitude saves.
A creature immune to sneak attacks is not vulnerable to nerve strikes. You cannot use a nerve strike while striking a creature with concealment or while hitting the limbs of a creature whose vitals are beyond reach.