Gut Strike

You instinctively know when you hit an opponent’s weak spot and can muster an extra bit of force to devastating effect, causing your foe to suffer momentary fatigue.

When you hit a creature with a weapon attack, you can use your reaction to give the target one level of fatigue for 1 minute. On a critical hit, the target gains two levels of fatigue instead. A target cannot gain more than two levels of fatigue from this maneuver.