Nobilis/YMMV


 * Too Good to Last: The second edition of Nobilis went out of print before more than just one supplement could come out for it. It didn't help that there was some funny business on the part of Guardians of Order, who took over distribution from Hogshead after they closed down. (The first edition did not have any supplementary materials.)
 * However, Dr Moran did release material from an abortive supplement (A Society of Flowers) as the 'peculiar books', free pdf downloads: "Unlikely Flowerings" and "Creatures, Clothed in Strangeness".
 * To say nothing of A Soul Of Your Own, which is an alternate setting (with alternate stats, an alternate worldview, and even alternate metaphysics... but still related) in which you play a band of wandering kung fu heroes who oppose the machinations of Nobles and Excrucians alike, because such beings are too powerful to fight, and thus the Warrior Poets cannot decide which is right through the truth of battle. No, really.
 * As of 3e, the Zu from that have been added to the default setting.