The majority of this book outlines a fantasy setting in a country called Opar and notable characters who inhabit it.
[1] A short adventure involves a book of arcane knowledge that disappeared and then reappeared as a possession of a good king of the elves.
[2] Dimension Six, based in Englewood, California, appeared in 1980 and published a number of products that year for fantasy role-playing including Furioso, Mountain of Mystery, The Temple to Athena, and The Nine Doctrines of Darkness.
Watson also commented on the incompleteness of its ideas, saying, "The Nine Doctrines of Darkness is less of an adventure than a detailed landscape peopled with interesting characters.
It begins with a well written background and then spends most of the remaining space giving the history, abilities, and probable behavior of a wide variety of character types."