Arc Lightning

A crackling bolt of lightning streaks from your hand toward a creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d6 lightning damage, and you can cause the lightning to leap from the target to a different creature of your choice that you can see within 15 feet of it. The second creature takes 1d6 lightning damage.

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