User blog comment:High King Ithilion/Amazon To Produce a Lord of the Rings Series/@comment-33185350-20171114142421/@comment-26149161-20171114144404

We really don't know. It could be anything from the Silmarillion to Shadow of War. The fact that the Tolkien Estate sought out the movie deal suggests it may be more canon-based, or it means that Christopher Tolkien has been Wormtongued.

Ithilion, Discussions Moderator (Auta i lómë)