Tremoring Echo

You cause the earth to shake viciously in a 10 foot-radius circle on a point within range. Each creature in that area must make a Strength saving throw, taking 2d6 thunder damage on a failed save, or half as much damage on a successful one. Does not hit flying creatures.

In addition, any creature that failed the save takes an additional 1 damage for every creature hit with this spell.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot above the 2nd.