Improved Nerve Strikes permits you to perform two special melee attacks: rip strength and rip dexterity. You may perform a nerve strike if you wield a weapon with which you are proficient. If your target has no discernable anatomy, you may not perform nerve strikes against it. You cannot perform nerve strikes against creatures two or more size categories larger than you.
Treating Nerve Strikes: Another person can aid the victim of a nerve strike and negate the strike’s effect. This requires a successful Heal check against the original Fortitude save DC of the strike. The check is a full-round action that provokes attacks of opportunity.
Rip Dexterity: This nerve strike lowers the victim’s Dexterity. Make an attack roll at a -8 penalty. If the attack hits your target and inflicts at least 1 HP damage, your target must make a Fortitude save against DC 10 + one-half your base attack bonus + your Strength modifier. If he fails the save, he suffers 2 points of temporary Dexterity damage.
Rip Strength: This nerve strike weakens the target, lowering his Strength score. Make an attack roll at a -8 penalty. If the attack hits your target and inflicts at least 1 HP damage, your target must make a Fortitude save against DC 10 + one-half your base attack bonus + your Strength modifier. If he fails the save, he suffers 2 points of temporary Strength damage.
Note: You cannot perform a nerve strike at the end of a charge.