Arc Bolt

You fire a small bolt of lightning at a creature within the spells range. Make a ranged spell attack. If it hits, they take 1d6 lightning damage. 

As a bonus action you can make the bolt jump to an additional target. You make an additional attack against a creature within half the spells initial range; However this attack is deals 1d4 lightning damage instead of 1d6.

The spell's damage increases by 1d6 and 1d4 when you reach 5th level (2d6 and 2d4), 11th level (3d6 and 3d4), and 17th level (4d6 and 4d4).