Earth Mantle

A line of churning earth appears as fire erupts along the ground that is 30 feet long and 5 feet wide starting from a surface you can touch in a direction you choose. Each creature in the line must make a Dexterity saving throw. A creature takes 2d10 fire damage on a failed save, or half as much damage on a successful one. The ground along the line becomes difficult terrain. This spell must move along a surface.

For the duration of the spell, you can use your bonus action to make the line fire up again. When reactivated this way, creatures in the spell area take 2d10 fire damage.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d10 for each slot level above 2nd.