Combo

Using a hand, you summon an arcane force that increases in power with violence.

The next time you hit a creature with a melee attack within this spell's duration, you gain an extra 1 point of damage on that attack. The second time you hit a creature with a melee attack within this spell's duration, you gain an extra 2 points of damage. For every subsequent successful hit within this spell's duration, you gain extra points of damage following the pattern of points of damage equal to the number of hits achieved since this spell took effect, as shown previously.

Whenever you take damage while this spell is in effect, make a concentration saving throw. If you fail, your "combo" of hits since this spell took effect resets to 0. You may rebuild your "combo" by hitting creatures more, but this spell's duration does not reset. If you succeed, you continue for "combo".