Erupting Soul Fire

You create an eruption of blue soul fire from the ground within range. You can make a 30 ft line in front of you erupt with this fire.

When the soul fire appears, each creature within its area must make a Dexterity saving throw. On a failed save, a creature takes 3d8 fire damage, or half as much damage on a successful save. If a creature ends its turn in the line of soul fire or within 5 ft of it, it takes another 3d8 damage. A creature takes the same damage when it enters the soul fire for the first time on a turn or ends its turn there.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for each slot level above 2nd.