Burrow

"Ever had roast armadillo my dear apprentice?"
"No sir, can't say I have. Sounds rather... tough."
"Indeed. However, much like castles, I think you'll find it's a matter of finding the softer underbelly."

You touch a willing creature. You imbue the target with magic allowing it to part earth, sand, mud, or ice, giving it a burrowing speed of 10 feet. The spell does not allow creatures to burrow through solid rock. While burrowing, a creature can breathe normally and leaves a tunnel behind them, large enough for a creature the same size to travel through prone.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you can target one additional creature for each slot level above 3rd.