Bolt of the stormlord

A stroke of lightning forming a line 100 feet long and 5 feet wide blasts out from you in a direction you choose. Each creature in the line must make a Dexterity saving throw. A creature takes 20d6 lightning damage on a failed save, or half as much damage on a successful one. If this attack is used against a mage of the electromancy line, they will not take any damage.

The lightning ignites flammable objects in the area that aren't being worn or carried.