Electrifying Grasp

Lightning springs from your hand to deliver a shock to a creature you try to touch. Make a melee spell attack against the target. You have advantage on the attack roll if the target is wearing armor made of metal. On a hit, the target takes 4d8 lightning damage, and it can’t take reactions until the start of its next turn. Upon a successful hit, you may cause the lightning to leap to one other enemy within 10 feet. Make another melee spell attack applying the same rules and effects as your original attack.   

At Higher Levels: When you cast this spell using a spell slot of 4th Level or higher, the damage increases by 1d8 for each slot level above 3rd.