Thunder Bump

You conjure two electrified spectral fists that collide with a thunderous crack. Each creature within a 10-foot radius [Tooltip Not Found] centered on a point of the collision must make a Strength saving throw., taking 5d6 thunder damage on a failed save or half as much damage on a successful one

If a creature fails the saving throw, the next attack roll made against it by an ally before the end of your next turn has advantage.

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 3.