Song of the Phoenix
A secret organization based in the Shrouded Isle. It is organized into (at least) three Houses: Melody, Harmony, and Silence. Kuan-Xi (Melody), Yanyu (Harmony), and Min Feng (Silence) have formed the first Triad for over a hundred years (in Phoenix Hearth). At their Triad ceremony, the Great Butterfly Spirit invoked prior agreements with the Great Phoenix Spirit such that Kuan-Xi, Yanyu, and Min Feng are authorized to share secrets with the party.
According to Takanata's Connections Readings, the Song of the Phoenix is the target of the Dragon Army's blockade of the Shrouded Isle. (In the Connections Readings, it is referred to as "Min Feng's Secret Society".)