By maintaining a grapple hold on your opponent, you can cause it to lose consciousness.
Prerequisites: STR 15
Benefit: Make an attempt to grapple a target. If you maintain a grapple for a number of consecutive rounds equal to your opponent’s Constitution bonus (minimum 1 round), you can attempt to knock out your opponent. The victim must succeed at a CON save (DC 10 + 8 + your STR modifier) or else it falls unconscious for 1d4 rounds. Each successive round you attempt this, the target takes a cumulative –1 penalty on its saving throw. Creatures that are immune to bleed damage, stunning, or critical hits are immune to this ability.