Booming Bludgeon

You concentrate sonic energy around you into a mace or hammer of solidified sound in your hand. It counts as a simple melee weapon with which you are proficient. It deals 2d8 thunder damage on a hit and has the light property. In addition, when you attack a deafened creature with the weapon, the attack has advantage. When you hit a creature with the weapon, that creature becomes deafened. If you drop the weapon or throw it, it dissipates at the end of the turn. Thereafter, while the spell persists, you can use a bonus action to cause the weapon to reappear in your hand. If you spent one or more sorcery points as part of casting this spell, it also gains the following feature: As an action, you can unleash the sonic energy inside the weapon in a 20-foot radius around you. Creatures in that area must make a Constitution saving throw. On a failed save, a creature takes 2d8 thunder damage, becomes deafened, and is knocked prone. A creature takes half as much damage and suffers no other effects on a successful save. The spell then ends.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage of the sonic burst increases by 1d8 for every slot level above 2nd. Additionally, when you cast it using a 3rd- or 4th-level spell slot, the damage of the weapon increases to 3d8. It increases again to 4d8 using a 5thor 6th-level slot, and to 5d8 using a spell slot of 7th level or higher.