At 4th level, once per day a brawler can unleash a devastating attack that can instantly knock a target unconscious. She must announce this intent before making her attack roll. If the brawler hits and the target takes damage from the blow, the target must succeed at a Fortitude saving throw (DC = 10 + 1/2 the brawler's level + the higher of the brawler's Strength or Dexterity modifier) or fall unconscious for 1d6 rounds. Each round on its turn, the unconscious target may attempt a new saving throw to end the effect as a full-round action that does not provoke attacks of opportunity. Creatures immune to critical hits or nonlethal damage are immune to this ability. At 10th level, the brawler may use this ability twice per day; at 16th level, she may use it three times per day.
