Arcing Lightning

You point at a creature that you can see within range, and lightning arcs out to the target. The target must succeed on a Dexterity saving throw or take 1d8 Lightning damage, and on a hit any enemies within a 5 foot radius of the target take 1d4 lightning damage. The target gains no benefit from cover for this saving throw. 

The spell's damage increases by 1d8 and 1d4 when you reach 3rd level (2d8, 2d4), 5th level (3d8, 3d4), 11th level (4d8, 4d4), and 17th level (5d8, 5d4).