Bolting Blade

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack’s normal effects, and you can cause a lighting bolt to strike all creatures excluding the target within 5 feet of you. The creatures takes 1d6 lightning damage.

This spell’s damage increases when you reach certain levels. At 5th level, the melee attack deals an extra 1d6 lighting damage to the target on a hit, and the lightning damage to the second creature increases to 2d6. Both damage rolls increase by 1d6 at 11th level (2d6 and 3d6) and 17th level (3d6 and 4d6).