Arc Lightning

You ground yourself and produce an electrical current in your hand. Choose one or two creatures you can see within range. If you choose two, they must be within 5 feet of each other. A target must succeed on a Dexterity saving throw or take 1d6 lightning damage.

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

Additionally, when you reach 11th level, you can choose one additional target and each one must be within 10 feet of the next creature.