Wondrous item (flute), requires attunement by a bard

A simple bone white recorder made of ivory, it feels unnaturally cold to the touch. Once attuned to Stillsong, the player can only produce a single, haunting melody from the recorder no matter what tune they attempt to play.

As the melody plays, flecks of black waft from the recorder and fill a sphere of 20 foot diameter. Within this sphere, the notes of the melody strike at the fibers holding the very weave of magic in the universe, slicing them apart and unraveling them. For the duration of playing, a 20 foot sphere around the recorder acts as a Field of Antimagic.

The player must concentrate on the music and can take no other action or they dispel Stillsong's field. The player is able to move as long as the movement does not pass through difficult terrain. Stillsong will not function underwater. After 1 minute of continuous play, the tendrils of music work their way into the player's head, dealing 1d4 psychic damage. After 2 minutes of continuous play, the damage increases to 3d4. After 3 minutes of continuous play the damage increases to 5d4. After 4 minutes of continuous play, the player must roll a d12. On a 1-4 the player takes 7d4 psychic damage, on a 5-8 the player takes 3d4 psychic damage and is unable to perform any magic for the next 1d4 days, on a 9-12 the player takes 10d4 psychic damage and is stricken mad as with the Madness effect for 1d10 days. After 5 minutes of continuous play the player takes 10d4 psychic damage and is stricken with Indefinite Madness. This can only be cured by a Greater Restoration or Wish spell. Stillsong cannot be played for longer than 5 minutes continuously. Upon ceasing to play the recorder, whether voluntarily, due to loss of concentration, or upon succumbing to the effects of playing Stillsong for extended periods, the recorder cannot be used again by the player for 1d4 days.