Decimation Bolts

You fire ten bolts of destructive elemental power. Each bolt fills a line 500 feet long and 5 feet wide. Each creature within the area must make a Dexterity saving throw. On a failed save, a creature takes 20d6 lightning damage and is stunned until the end of that creatures next turn. On a successful save, a creature takes half as much damage and is not stunned. Any spells or magical effects within the area of one or more bolts are dispelled.