The Flute of Tonus originally belonged to Tonus, the founder of the House of Tonus from the Mythsetia Veil. It was eventually passed down to her descendants and currently rests in the hands of Melody the Nightingale, the only living descendant of Tonus. During the Great Purge, the Flute was taken to Sanctuary Zone during an escape attempt led by the House of Spatia, where it remained with the family's final descendant, Melody.
The Flute is capable of controlling the movements of those who hear it's hypnotic tune. Members of the Tonus bloodline are unaffected by it's influence, but they must continue playing the song in order for the control to last. The instant they stop playing or they mess up a note, the spell will be broken.