These bagpipes are made of small leather scraps with a few rat skulls dangling off them. Ordinary and giant rats are indifferent toward you while this instrument is in your possession.
This item has 3 charges, regaining 1d3 charges after a long rest.
As an action you can choose to play the pipes, using up to three charges when you do so. For each charge used a swarm of spectral rats appears for up to 1 hour. When they appear, you must make a Charisma check contested against the swarm's Wisdom check. If you fail, the swarm behaves as it normally would. If you succeed, the swarm becomes friendly toward you and your companions until they disappear or are dismissed early. A friendly swarm obeys your commands, and if a swarm is not given any commands it will take only the actions required to defend itself.
Notes: Bonus: Charisma Ability Checks, Befriend a rat, Instrument