Surging Smite

The next time you hit a creature with a melee weapon attack before this spell ends, the weapon explodes with stormy magic. The attack deals an extra 2d6 lightning damage to the target. You can then designate up to three other creatures within 15 foot of the target, who must make Dexterity saving throws as lightning arcs from the initial target to them. On a failed save each additional target takes 1d6 lightning damage, or half on a success.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage caused by the initial attack and the additional arcs is increased by 1d6.