Nár was the lone companion of Thrór during his ill-fated attempt to reclaim Moria (before Balin's attempt). They journeyed from Dunland, crossed the Redhorn Pass, and came into Azanulbizar before finally approaching the East-gate of Moria. Nár, sensing danger, cautioned Thrór to beware, but Thrór did not listen to his counsel and walked proudly into Moria as its rightful heir.
Nár stayed outside and hid nearby for three days. Then Azog, the orc chief of Moria, had the decapitated body of Thrór flung out onto steps of the East-gate, to which Nár was filled with horror. Azog then used Nár as a messenger, demanding that he return to his people and warn them that beggars, who dared enter Moria and attempt thieving, would fare the same. Azog declared that he had killed Thrór and that he now ruled Moria as king. Nár was prevented from retrieving the severed head of Thrór, on which Azog had carved his own name. As a final insulting gesture, he was struck with a small pouch of coins that were of little value. As Nár fled down the Silverlode, he looked back and saw that Orcs had appeared out of the gate were hacking apart the body of Thrór and flinging the pieces to the black crows.
Portrayal in adaptations
In The Lord of the Rings Online Nár, now an elderly dwarf with bad eyesight and even worse memory, is living in Zudrugund, a settlement of Longbeards exiles from Erebor in Dunland that was abandoned when Thorin II Oakenshield led his people to Ered Luin. Nár stayed behind and his elder years is now being looked after by Frithgeir, the only other dwarf in these lands.
On their way south to Aragorn's aid, the Rangers of the Grey Company come across Zudrugund and are shocked when the senile dwarf talks of their destination as if he had known it for weeks. While some of the Rangers attempt to shake Nár's memory to reveal the source of his knowledge, Zudrugund is attacked by the White Hand orcs, but the Rangers drive them back. When the Rangers prepare to depart, Nár finally reveals that he has been told of their mission by his old and trusted friend Saruman the White.
When the player is imprisoned in Orthanc, Saruman taunts them that he had observed their movements for a long time and claims to have killed Nár after his usefullness came to an end. After escaping the captivity, the player checks back on Nár and Frithgeir and discovers that Saruman had tol yet but another one of his lies. After end of the the Siege of Erebor, the new Longbeard King Thorin III Stonehelm learns that Nár is still alive from the player and invites the old friend to live the rest of his days in peace under the halls of the Lonely Mountain, a journey which Nár and Frithgeir undertake without much incident.