The subject of this article or section originates from non-canonical sources. To find out about what is considered "canon" see LOTR:Canon.
She is non-canonical, as her identity was invented for Decipher's The Lord of the Rings Trading Card Game.
During the War of the Ring, when the One Ring had awoken from its long sleep and was ready to return to its rightul master, Berembor was among the elves that refused to leave Middle-earth and chose to aid anyone who would fight against the armies of Mordor and Isengard. She accompanied Haldir of Lorien to Helm's Deep, a large valley in the north-western Ered Nimrais. There, she and her kin would aid King Theoden and his people in defending the keep from an army of 10,000 Uruk-hai that were dispatched by Saruman to wipe out the people of Rohan. Stationed at the Deeping Wall, she was seen between Erethón and Celebrílad when Aragorn walked pass them, informing all elves to show no mercy to the Uruk-hai that were preparing to charge. As the Uruk-hai were charging towards the fortress, including the Deeping Wall, Berembor and the elves loaded their bows and demonstrated their unmatched proficiency of archery, loosening devastating hails of arrows in seconds, killing many Uruk-hai. She was eventually killed during the Battle of Helm's Deep.