Burning Flash

You conjure a bright, burning flash to blind and burn your enemies. Each creature in a 20-foot cone must make a Dexterity saving throw. A creature takes 5d6 fire damage and become blinded until the start of their next turn on a failed save, or suffers half as much damage and isn't blinded on a successful one. In addition, if a creature fails the saving throw by 5 or more and is a humanoid, they are permanently blinded.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 2d6 for each slot level above 3rd.