You create an orb of electricity that acts as a tesla coil, electrocuting anything within its radius. The sphere has a diameter of 5 feet but can damage creatures up to 20 feet away from it. When summoned, any creature within the sphere's range must make a Dexterity saving throw. On a failed save, a creature takes 4d6 lightning damage, or half as much damage on a successful save. Any creature within the actual tesla (the center of the sphere) has disadvantage on its saving throw.
Additionally, you may sacrifice your movement to move the sphere. Your movement can not be split between the sphere and the caster.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.
* - (a shaving of copper)