Nimlachon is only old enough to remember a glimmer of the light of the Trees of Valinor; to remember an arduous journey and the faint smoke of ships set ablaze. To remember murky dreams of travels underfoot and shadows hounding steps, and the chilling frost of winter. The first true memories he can lay a claim to now are that of the City of Seven names; of the city of Gondolin, where he was raised in the House of the Swallow. As an only child, he made quick friends with children from all the houses, including that of his cousins, whom he did not share a house with (in their days of bearing arms). He was quickly acclaimed as a promising archer; his eyes could catch hold of anything that dared move on the field of battle. During the Fall of Gondolin, though he stood with the members of his house and fought fiercely to defend their home, he was ultimately forced to flee to Sirion. In his escape, he rescued the family of a smith from the House of the Hammer of Wrath; a family he was close to. While the mother ultimately perished in their flight, he rescued the daughter and the son. Nimlachon and his father became their minders from then on. He never forgot, however, the moment he saw his uncle flee his post as a shield-warden. He does not often speak of this battle. 

He fought in the War of Wrath again as an archer, and came away alive and unscathed, save for a few lasting scars on his body and his feä. Nimlachon and his surrogate sister left for Eregion. His surrogate brother and his father fled to Lindon.

He served under Gil-galad after Eregion's fall in the Second Age, up to and including the Last Alliance of Elves and Men. At Dagorlad, he was forced to loose an arrow into a companion of his whom he saw be taken prisoner. They called out to him to end their suffering ere it began, and he obliged. He still has nightmares of this; wondering if what he did was truly justified in the end. He would like to believe it was. He walked away from this battle fatherless, as the last of his remaining kin was slew on the plains; another victim for the Dead Marshes to hold. Even after victory was won, Nimlachon suffered greatly in his guilt, and he hid away in the darkest corners of Felegoth for as long as he was allowed. Those who were close to him assumed him dead, and many still do. It was there in the Halls of Felegoth that he offered his services as restitution to the widow of the elf he slew in mercy; though it was done to assuage his guilt more than truly out of altruism, the son that was left behind has become a surrogate child to Nimlachon.

He swore fealty and service to Thranduil during the Third Age, and drew arrows and breath in the Battle of the Five Armies; though he suffered an injury early on, and watched much of the battle from afar with the other wounded who were being tended to. After that, he put away his bow and quiver for a time to take an interest in more scholarly pursuits, as he planned to head to Valinor as the Shadow in the east grew. However, as he went to seek out his family in Arda (his remaining cousin and his siblings), he was convinced that he should remain in Arda for their sake. He now rests in Imladris, a wary hand on his bow, but quick to lend an ear or helping hand to his remaining kin or any others who would seek him out.