Tremor

You cause the ground beneath a creature you can see within range to tremble violently. If the creature is on the ground, it must succeed on a Dexterity saving throw or take 1d6 bludgeoning damage and fall prone.

The spell’s damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).