No proficiency is needed to use this whistle. It has 3 charges. You can use an action to play it and expend 1 charge to create a high pitched whistle.

Choose one creature, object, or magical effect within range. Any spell of 3rd level or lower on the target ends. For each spell of 4th level or higher on the target, make an ability check using your spellcasting ability. The DC equals 10 + the spell's level. On a successful check, the spell ends.

The whistle regains 1d3 expended charges daily at dawn.

Notes: Control, Debuff, Utility, Instrument