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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, Orollon 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 Haldor 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 with several elves when Aragorn walked pass her, informing her and the elves to show no mercy to the Uruk-hai that were getting ready to charge. As the Uruk-hai were charging towards the fortress, including the Deeping Wall, Orollon and the elves loaded their bows and demonstrated their unmatched proficiency of archery, as they loosened devastating hails of arrows in seconds, killing many Uruk-hai. She was eventually killed during the Battle of Helm's Deep, but her death and everyone who was slain in the battle was honored by Théoden.
- Orollon is not seen in the books.