Arcing Smite

The next time you hit a creature with a melee weapon attack during the spell’s duration, you can make your weapon emit a surge of lightning. The attack deals an extra 2d8 lightning damage to the target, and any creatures within 10 feet of the target must make a Dexterity saving throw or take 1d8 lightning damage, as the lightning arcs wildly off of the target.

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