Thunder Bringer

You conjure a storm cloud that hovers 20 feet above a point you choose within range. The cloud covers a 20-foot radius and crackles with thunder and lightning. When the cloud appears, each creature underneath it must make a Dexterity saving throw. On a failed save, a creature takes 3d6 lightning damage and is deafened until the end of its next turn. On a successful save, the creature takes half as much damage and isn't deafened.

As long as you maintain concentration on this spell, you can use your bonus action on each of your turns to call down a bolt of lightning to strike a point you choose within the area covered by the storm cloud. Each creature within 5 feet of that point must make a Dexterity saving throw, taking 2d6 lightning damage on a failed save, or half as much damage on a successful save.

At Higher Levels: When you cast this spell using a spell slot of 4th level or higher, the initial damage and the damage from the lightning bolt both increase by 1d6 for each slot level above 3rd.