Ango Uru

From the caster's hand a large blast of fire is released that trails for 200 ft. The radius of which is 12.5ft.

Each creature within its area must make a Dexterity saving throw. On a failed save, a creature takes 3d10 fire damage, or half as much damage on a successful save.

At Higher Levels. When you cast this spell, the damage increases by 1d10 for every other character level starting (7,9,11,...).