Earthen Fists

You touch a willing creature, causing its fists and arms to be coated in stone. These stony fists can be used as to make unarmed strikes and last for the duration. Until the spell ends
the creature can use its action to make a Stone Fist attack. On a hit the target takes 3d6 bludgeoning damage.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for every two slot levels above 2nd.