Shadowrun: Court of Shadows - Rules of Play says:
Court of Shadows is an alternate setting for Shadowrun, Fifth Edition, emphasizing the magic and intrigue of the Seelie Court. With full setting, character, and plot details, as well as information on using SR5 characters in the Seelie Court, this book presents all-new ways to play Shadowrun and to live in the mystical intrigue of the planes of fairy, capturing the magic of the dream world—and seeing if they can prevent its fall.