Arcing Bolt

You release a beam of lightning stretching from your hand at a creature within range. The target must make a Dexterity saving throw. On a failed save, the target takes 1d8 lightning damage and the lightning arcs from the target to a different creature of your choice within 10 feet of it. The target must make a Dexterity saving throw. On a failed save, the target takes half as much damage and the lightning arcs from the target to a different creature at random within 5 feet of it. The target must make a Dexterity saving throw. On a failed save, the target takes half as much damage as the previous target.

This spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).