Chance's Blessing (3.5e Maneuver)

You weave probability with your blade, calling into reality powerful possible attacks that cruelly cut at your foe's vitals.

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 4d6 extra damage. If you use the lower attack roll, the attack deals an additional 6d6 damage and the opponent must make a Fortitude save, DC 15 + your Wisdom modifier, or take 1d3 Constitution damage. If both rolls are the same, you must reroll one until you get a different result. This maneuver is a supernatural ability.