Earth Tremor

You cause a tremor in the ground in a 10-foot radius. Each creature other than you in that area must make a DEX saving throw. On a failed save, a creature takes 1D6 Bludgeoning damage and is knocked Prone. If the ground in that area is loose earth or stone, it becomes Difficult Terrain until cleared.

Using a higher-level spell slot: The damage increases by 1D6 for each spell slot level above 1.