Molten geysers erupt out from the earth in a 40 foot cube centered on a point on the ground that you can see within range. The area extends into the ground and spreads around corners. Each creature in the area must make a Dexterity saving throw, taking 6d6 fire damage on a failed save or half damage on a success.

Cracks and fissures filled with molten lava open up in the area and churn the remaining solid earth, making the ground in the area difficult terrain until the spell ends. Any creature that enters the spell's area for the first time on a turn or ends its turn there must make a Dexterity saving throw. A creature takes 6d6 fire damage on a failed save, or half as much on a success. A creature has disadvantage on the saving throw if it is burrowing or prone, but creatures that aren't touching the ground automatically succeed on the saving throw.

This spell ignites flammable objects in the area that aren't being worn or carried. When the spell ends, the ground in the area cools, solidifying into difficult terrain until cleared. Each 5-foot-square portion of ground in the area requires at least 10 minutes to clear using mason's tools or a miner's pick.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage dealt increases by 1d6 for each slot level above 5th.