"You give the choice to an ill chooser" - Aragorn (when deciding what to do after the breaking of the fellowship). "Shadow of War" is a consistent phrase used throughout the books, as well as the title of the latest videogame, Middle Earth: Shadow of War.
DISCLAIMER: All Illustration was created by Grayson van Loon. Photos/Mock-up assets have been edited but are not owned by Grayson van Loon