The Worm Ouroboros
The Worm Ourorobos is second only to the Lord of the Rings in the pantheon of 20th century English fantasy. E.R. Eddison, who moved in the same literary circles as Tolkien, was praised by Tolkien as ‘The greatest and most convincing writer of invented worlds that I have read’. The book describes the protracted war between the domineering King Gorice of Witchland and the Lords of Demonland in an imaginary world that appears mainly medieval and partly reminiscent of Norse sagas.
The book is set on Mercury; however, keep in mind this is not science fiction, so this is not literally the planet Mercury. Eddison on several occasions in the body of the book calls the world ‘Middle Earth’, and the setting is recognizably the Midgard of the Norse myths and sagas, although for some unexplained reason the denizens worship the Greek pantheon. The cast of characters, like Tolkien, are principally masculine, albeit with a couple of standout female leads. And lastly the various nationalities (Demons, Witches, Pixies, Imps, etc.) are not really separate species as in Tolkien; they are all essentially humans.