Vibrosonic Weapon

When you cast this spell you drum on a hard surface with the tuning fork and as it hums, you cause a portion of the weapon to open like the skin of a partially peeled apple, revealing a space large enough to insert tuning fork within. When swung in combat the weapon vibrates an intense and audible acoustic frequency. Until the spell ends, the weapon thrums with sonic energy and cracks on impact dealing an extra 1d6 thunder damage to any target you hit with the weapon. If the weapon isn’t magical, it becomes a magic weapon for the spell’s duration.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the charge lasts for up to 8 hours.