As part of this maneuver, you make a single melee attack against an opponent. You make two attacks rolls for it, selecting which one to use. If you use the higher attack roll, the attack deals 5d6 extra damage. If you use the lower attack roll, the attack deals an additional 8d6 damage, and the opponent struck must make a Fortitude save, DC 17 + your Wisdom modifier, or be stunned for 1 round. If both rolls are the same, you must reroll one until you get a different result. This maneuver is a supernatural ability.