Durax's Destructive Bolts

Three strokes of lightning each forming a line 100 feet long and 5 feet wide blasts out from you in a direction you choose. Each creature in one of the lines must make a Dexterity saving throw. A creature takes 8d6 lightning damage on a failed save, or half as much damage on a successful one.

The lightning ignites flammable objects in the area that aren't being worn or carried. The lightning also destroys full and partial cover.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the there is an additional stroke of lightning for each level above 5th.