Polygon: Monolith Productions revealed that Middle-earth: Shadow of Mordor's mysterious Wraith character is Celebrimbor, the original forger of the Rings of Power in J.R.R. Tolkien's Middle-earth legendarium.
Celebrimbor does not appear in the The Hobbit or The Lord of the Rings, which means most of Tolkien's modern audience will be introduced to this Elven warrior through the game, not through Tolkien's work. Celebrimbor's time in Tolkien's world occurred long before Thorin and his Company of Dwarves challenged Smaug for Erebor, and his work is directly responsible for Bilbo Baggins being such an excellent burglar due to his use of the one ring.
With this one character addition, this one plot point, Monolith Productions has proven the lengths to which they are willing to go to make Middle-earth: Shadow of Mordor true to Tolkien's world, even though its story wasn't written by Tolkien himself. Celebrimbor's presence in the game means that everyone should be paying attention.