>Tempest Cleric 2/Sorcerer 17
>Cast Meteor Swarm
>Transmute Spell Metamagic changing the fire damage to lightning or thunder
>Channel Divinity: Destructive Wrath to maximize the lighting/thunder part.
>spell now deals 120 Lighting/Thunder + 20d6 Bludgeoning Damage, or half on a successful save to each creature caught in each of the 4 40ft radius spheres.