The Book of Ebon Bindings

From Worldcat: "A role-playing aid for the Empire of the Petal Throne, with applicability to all Tékumel game settings. Comprised of an introduction to the religion of Tsolyánu and a discussion of its magical arts and demonology, with the bulk of the work being a translation of The Book of Ebon Bindings, the ancient text revealing rituals and incantations used to call forth creatures from the 48 planes of being." {{Reginald3}} classifies this simply as "fiction"