Tolkien, as a professional philologist, had been asked to translate an inscription at the late Roman temple of Nodens at Lydney Park in Gloucestershire.
He appeared to be an Elf, and claimed he has been sent by the Valar to share his wisdom and skills in ring-craft and jewelry for the benefit of all Middle-earth; but in fact he was the Dark Lord Sauron in disguise.
Annatar provided valuable and seemingly benevolent guidance and instruction to Celebrimbor and the smiths of Eregion, and they began making the Rings of Power for the rulers of Middle-earth—seven for the Dwarf-lords and nine for Men.
Celebrimbor was captured in the sack of Eregion, and was forced under torture to disclose where the Nine and the Seven were held, but he would not reveal the whereabouts of the three Elvish Rings.
Celebrimbor died from his torment; his body, shot with arrows, was then hung upon a pole and used by Sauron's forces like a banner on the battlefield.
[T 4] Like Galadriel and Gil-galad, Celebrimbor first appeared as a character in The Lord of the Rings and then had to be inserted into The Silmarillion, leading to multiple changes to his descent.
In a c. 1968 version of the story, included in the essay Eldarin Hands, Fingers and Numerals,[T 6] Celebrimbor was one of the Teleri of Aman, one of the three companions of Galadriel and Celeborn (here made into a Telerin prince Teleporno or Telporno).
[T 4] Celebrimbor was of the royal line of Finwë, high king of the Noldor, the elves especially skilled in craftwork who migrated to Valinor and lived in the blessed realm.
[12][13] The game takes place sometime between the action of The Hobbit and The Lord of the Rings at which time Celebrimbor survives as an amnesiac wraith.
This leads to the events of the 2017 sequel Middle-earth: Shadow of War, which reviewers described as "fun, inventive, exciting—and totally non-canonical".
Talion survives by becoming a Nazgûl, and Celebrimbor is defeated when forced out of Eltariel and is quickly absorbed by Sauron trapping both of them in the form of a large flaming eye on top of Barad-dûr.
Celebrimbor remains trapped as part of the Dark Lord until the One Ring is destroyed, freeing the spirit as Sauron dies.