Sap

This feat has a chance to render the target briefly senseless, though it will become active if damaged again. It has a cooldown of 15 seconds. Some creatures may be immune to the sap effect. (Creatures who cannot be sneak attacked will not be affected. Must make a regular attack at no penalty (though you do not get your backswing).  If it hits, target takes save.  If save fails, target is stunned for a brief period of time.  Attacks against the target do not remove the stunned effect.)

Prerequisite: None