Arnimloth was born in the year 512 of the Third Age, when Greenwood the Great was a glistening jewel, which raised itself as a emerald sea, harbouring inside it the heart of an elven kingdom. Of sindar father, and nando mother, she inherited the pristine hair of the first, and the grace of the second. Throughout the years, she proved to be skilful with both bow and sword, becoming a soldier at the service of the King Thranduil. Calm and pleasant were those days, until the Shadow of the Necromancer crept itself into the blessed forest. He cursed the land and twisted the trees. The songs turned into tears, and the light became an odious gloom. Thus, Greenwood was corrupted. From that moment, Arnimloth swore to give her life and soul to recover the forest as it was in the past, devoting all her energies to draw those fiends out of the homeland of the woods elves.

After centuries under loyal service of King Thranduil, Arnimloth has traveled to different places of the Middle Earth on several quests. From obscure investigations in the gloomy lands of Angmar, to participation in massive conflicts such as the Battle of the Five Armies in Erebor. Her most recent activity took place in Southern Mirkwood, where she joined the Galadhrim from Lothlórien in the military expedition against Dol Guldur.