D'Aeyla's Solar Flare

You hold a hand forward and speak the name of the Sun God, emitting a bright burst of holy fire. Each creature in a 15-foot cube originating from you must make a Dexterity saving throw, and each creature within a 30-foot cube must make a Constitution saving throw. A creature takes 4d8 fire and 4d8 radiant damage on a failed save (Dexterity), and half as much on a successful one. On a failed save (Constitution), targets are blinded until the end of their next turn. 

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the range for damage increases by 5 feet, and the blinding effect by 10 feet.