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Portrayal in adaptations
Eltariel was likely of the Galadhrim; there are no details given of her birth.
By the late Third Age, she had become a proficient warrior, and was selected by Lady Galadriel to confront and destroy the Nazgûl within Mordor itself. Initially, Eltariel enjoyed the challenge of hunting the Ringwraiths, but eventually she began to question her purpose, as the Nazgûl proved to be impossible to permanently destroy.
Following the creation of a new ring of power by the ranger Talion and the wraith of Celebrimbor, Talion traveled to Minas Ithil in an attempt to break the Witch-king's siege of the city, though Shelob had taken the new ring from him by force. Ultimately, the city fell, and Talion was surrounded by the Ringwraiths. The Witch-king dominated Talion in order to turn the ranger to his will, but Eltariel, ever on the trail of the Nazgûl, fought them off and broke the Witch-king's hold over Talion.
The Nazgul, discovering that Shelob held the new ring, quickly went to Cirith Ungol in order to take it from her. Talion and Eltariel followed them, and Eltariel drove off the Ringwraiths using the Light of Galadriel. Shelob decided to return the ring to Talion thereafter, and Talion left to begin his campaign against Sauron. In the following weeks, Talion conquered many regions of Mordor, with Eltariel often stepping in to assist in fighting the Nazgul. Eventually, though, during Talion's final assault on Barad-dûr, Talion and Celebrimbor came to a disagreement after defeating Isildur's wraith. Celebrimbor abandoned the ranger, and instead bonded with Eltariel, who agreed to aid him in attacking Sauron. Eltariel and Celebrimbor fought the Dark Lord at the pinnacle of Barad-dûr, culminating in Celebrimbor and Sauron being locked together in an indefinite battle, thus creating the visible Eye of Sauron.