Adwr Cadarn was an elf sent to Prifddinas during the Fourth Age, when much of the elves' population had settled beyond the Galarpos Mountains. In the year 1930 of the Fourth Age, the elves of the Cadarn Clan that had settled in Misthalin, Asgarnia, and Kandarin lost all contact with their kin beyond the mountain pass of Arandar, an event known as The Great Divide. When the Cadarn Clan, the elves' main military force, was unable to traverse the mysteriously-abandoned Arandar mountain pass, they decided another method of contact must be devised.