Chained Spark

You reach out as lightning arcs at a creature and then spreads to another in the vicinity. You target one creature within range, and then one additional creature within 10 feet of the original target. Both creatures must succeed on a Dexterity saving throw or take 1d6 Lightning damage. Creatures wearing metal armor or made of metal have disadvantage on the saving throw. This spells damage increases by 1d6 at 5th level (2d6), 11th level (3d6), and 17th level (4d6)