The Abyssal Whistle appears to be a perfectly normal flageolet (penny whistle) made of tin, copper, or other cheap metal. It is engraved with nondescript designs that somewhat resemble arcane runes to the untrained eye, but are actually just random decorations. When played by an individual proficient in Performance, it behaves like a normal instrument. When played by an individual who is non-proficient in Performance, the following magical effects are revealed:

- the player is able to create a beautiful melody of their choice, played at a DC 20 Performance check and lasting for one minute.

- once a melody is begun, it must be completed. The player attempting to end a song prematurely must succeed at a DC 20 Wisdom save. On a success, the player ends the song. On a failure, the player takes 2d6+2 Psychic damage and continues playing.

- when the final note is reached - regardless of the melody chosen -  instead of music, a horrific scream emanates from the whistle. It can be heard in a 600 ft. radius. Everyone within 20  ft. of the sound must succeed at a DC 15 Wisdom saving throw, or be Stunned until the end of their next turn. 

Notes: Frightened, Control, Instrument