Black Flash

You perfectly synchronize your cursed energy with a physical strike, creating a spatial distortion that multiplies your impact. The next time you hit with a melee attack before the spell ends, that attack deals an extra 4d10 force damage and ignores resistance to bludgeoning, slashing, or piercing damage.

If you roll a natural 20 on the attack roll, the bonus damage becomes 8d10, and the target must make a Constitution saving throw or be stunned until the end of your next turn.

After successfully triggering Black Flash, the spell ends.