Eruption

You place your palms against the earth, causing the ground to tremor and crack. A point you choose within range explodes into a spray of molten rocks and lava, and each creature within 30 feet of the explosion must make a Dexterity saving throw, taking 4d6 fire damage plus 4d6 thunder damage on a failure and half as much on a success.

The explosion leaves the ground devastated. Until the end of your next turn, the area in a 30-foot radius circle centered on the eruption point is difficult terrain.

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