Sundering Aurora

Description

You draw a shard of the first dawn down through the ceiling of the world. A curtain of white and violet light unfurls in a line 300 feet long and 20 feet wide, standing for the space of a heartbeat before it tears itself apart. Each creature in the line makes a Dexterity saving throw, taking 7d6 radiant damage plus 7d6 lightning damage on a failed save, or half as much on a successful one. A creature that fails the save is also Blinded until the end of its next turn, and any creature reduced to 0 hit points by this spell is disintegrated into a drifting column of bright ash. The aurora sunders what stands in it as readily as who: unattended objects in the line, and any structure made of stone, wood or metal, take the full damage without a save, and nonmagical barriers up to 6 inches thick are cut cleanly through. The light leaves behind a scorched, faintly humming line across the ground that glows for one minute and then fades.