Electric Claws

You touch one willing creature and reverent arcs of lightning cover its hands. Until the time runs out, the creature can use its action to electrify a creature within 15 feet of it as an action.  If the creature attacks a target with their bare hands, it does lightning damage, on top of the original damage. The target of the electricity must take a Constitution saving throw, taking 3d8 lightning damage on a failed save, or half as much on a successful one. The target has disadvantage if it is wearing metal armour.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the target of the spell can target a creature that is an additional 5 feet away from it for each slot level above 2nd.