Gyuel systemCanonLegendsInfinities Sources The Complete Star Wars EncyclopediaThe Essential AtlasAppearancesDark Nest I: The Joiner King (First appearance) (Unknown)Unknown UnknownNoneFate of the Jedi: Abyss (Mentioned only) (Unknown)Unknown UnknownNoneFate of the Jedi: Abyss audiobook (Mentioned only) (Unknown)Unknown UnknownNone