Arcing Strike

The next time you hit a creature with a weapon attack before this spell ends, the weapon crackles with electricity as you strike. The attack deals an extra 2d6 lightning damage to the target and the bolt leaps from the target to a different creature of your choice that you can see within 5 feet of it, dealing 1d6 lightning damage to that creature. If the target of your attack is wearing metal armor, the attack roll is made with advantage.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the extra damage increases by 1d6 for each slot level above 2nd.