Bronze Dragon's Wrath

A stroke of lightning forming a 15-foot line blasts out from you in a direction you choose. Each creature in the line must succeed on a Dexterity saving throw to take 1d6 lightning damage. Those affected have disadvantage on this saving throw if they are wearing armor made of metal.

This spell’s damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).