Dao's Entombment

You conjure a rift deep into the Earth plane, taking a sliver of it back to your world. Choose a point in range; a wall of rock springs into existence at that point. The wall is up to 10 feet wide, 1 foot thick, and 4 feet high. It has an armour class of 10 and 20 hit points. The wall is immune to poison, necrotic, and psychic damage. 

At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, you can delve deeper into the plane of Earth. The wall's maximum hit points increase by 5 per slot level above 2nd.