Tvash-Prull's bonefiddle

Tvash-Prull's bonefiddle was a necromantic bard spell that conjured a spectral fiddle bow that sawed into the frame of a creature, producing a ghostly melody.

Effects
When the spell was cast, the bonefiddle appeared above the targeted person or creature and immediately drew itself upon their body. It produced an eerie but alluring song that continuously disrupted the creature's mind. These effects were not stopped if the caster broke line-of-sight with the creature but could be resisted by those who were particularly resilient.

The bonefiddle only affected skeletal creatures or those with bodies that possessed some form of exoskeleton. The caster could transfer the fiddle to another creature at will.

Casting
The casting of this spell required verbal and somatic components in addition to a tiny silver fiddle worth at least 30 gp.