Dagger (very rare, requires attunement)
A magical musical dagger of explosive properties. When inactive, the blade functions as a normal dagger. When activated (no action required), the blade splits down its middle and separates by a few inches, forming a shape similar to that of a tuning fork. In this state, an attack with the dagger deals no initial damage. However, an attack against an object causes that object to explode in a 10-foot-radius sphere at the start of your next turn. Each creature within range must make a Dexterity saving throw (DC10), taking 4d6 thunder damage on a failed save, or half as much on a success. Magical objects are not destroyed, though the explosion still occurs.
A Bard who attunes to this weapon can substitute the DC with their own spell save DC.
The deadly and musical assassin Scaramouche the Merciless is known to wield this weapon.