Thundergrave

You create a burst of energy that travels through the ground, causing it to shift downwards by 1d6 ft. Each creature within range, other than you, must succeed on a Constitution saving throw or take 2d6 thunder damage and fall prone. On a success, the target takes half as much damage and does not fall prone.

In addition, the spell emits a thunderous boom audible out to 200 feet.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.