Arcing Bolt

You send a bolt of electricity towards a target that jumps to other enemies in the area. Make a ranged spell attack against a creature in range. On a hit, the target takes 1d4 lightning damage. You may then deal an additional 1d4 damage to either the original target, or to a creature within 10 feet of the target that must then make a dexterity saving throw to avoid the damage.

The initial damage and the additional damage increases when you reach 5th level (2d4), 11th level (3d4) and 17th level (4d4). The additional damage may be spread however you wish between creatures in range, hitting up to 5 creatures at 17th level. However, no matter how the additional dice are distributed, no creature can suffer more d4's than the original target.