Throwing it back

The caster turns and throws it back, their ass cheeks clapping with an unbridled power, target takes 3d8 Thunder damage and is pushed 10 feet away from the caster. On a successful save, a creature takes half as much damage only.

In addition, unsecured objects that are entirely within the Cube are pushed 10 feet away from you, and a thunderous boom is audible within 300 feet.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 1.