Faule Blute (腐れ華, Kusare Hana) is a highly organized and powerful Dark Guild with influence across Ishgar. Unlike most other dark guilds, Faule Blute operates in sync with organized crime and the flow of the criminal underground, accumulating power via control and influence upon other organizations. The exact size, scope, and goal of the guild master Persephone are unknown.
The only real rule is that no one knows of Persephone's true name or appearance.
If you know of one of my older abandoned projects (the Malvita), you will recognize similar imagery and thematics to Faule Blute's organization and motif.
I've always been particularly fond of traditionally "beautiful" imagery in a dark setting.