Darbons Sand Cannon

As you hold the small stone in your fist and hit it with the palm of your other hand, a thin stream of sand 20 feet long and 5 feet wide shoots forth from your fist. Each creature in a 30-foot line must make a Dexterity saving throw. On a failed save the creature takes 4d6 bludgeoning damage and is blinded until the end of their next turn, or half as much damage and is not blinded on a successful one.

At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot above 2nd.