Burrow

Your fingernails lengthen and turn into stone-hard claws, and for the duration of the spell, you have a burrow speed of 20 feet. You can't burrow through solid rock. If you choose to fight with your claws, they inflict 1d6 + your Strength modifier slashing damage on a successful hit.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, your burrow speed increases by 5 feet per slot level above 2nd. You can't burrow faster than your normal walking speed.