Knockout Punch (Maneuver)

When you hit a Large-sized creature or smaller with an unarmed strike you may expend on superiority die to attempt to stun the creature. You add the superiority die to the attack’s damage roll. The target must make a Constitution saving throw, with a DC equal to the total damage dealt by the strike. If it fails, it is stunned until the start of your next turn. If it fails by 5 or more it is knocked unconscious for 1 minute.