Emmyth's Shocking Bolt

You shoot a small jolt of electricity from your fingertips that arcs toward a foe of your choosing. Make a ranged spell attack against the creature. On hit, the target takes 1d6 lightning damage. On a critical hit, the bolt explodes on impact, dealing the full critical damage to the initial target and doing half as much to any creature within 10ft of the target.

The damage dice of this spell increase by 1d6 at the following levels (5th, 11th, 17th)