Earthbolt

With a strike to the ground, a bolt of geomantic force forming a line 100 feet long and 5 feet wide blasts out from you in a direction you choose. Each creature touching the ground in the line must make a Dexterity saving throw. A creature submerged in the area has disadvantage on the save. A creature takes 8d6 bludgeoning damage on a failed save, or half as much damage on a successful one. This spell functions only if you are standing on dirt, clay, stone, or sand.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.