Thundercrash

Your fist is wreathed in crackling lightning and you launch yourself like a missile toward a point or creature you can see within range. If targeting a creature, make a melee spell attack. On a hit, the creature takes 6d8 Lightning damage. If the attack misses, you land at a point of your choice that you can see within 10 feet of the targeted creature.

Upon landing, a thunderous aftershock wave explodes from you. All creatures within a 20-foot-radius sphere centered on yourself must make a Dexterity saving throw, taking 6d8 Thunder damage and becoming deafened until the start of your next turn on a failed save. Creatures that succeed on their saving throw take half as much damage and are not deafened. The initial target automatically succeeds this saving throw.

At higher levels: When casting this spell using a spell slot of 6th level or higher, the damage dealt by the aftershock wave increases by 1d8.