At the end of the First Age, after the defeat of Morgoth, some Elves made the realm of Mothronbor. Mothronbor, it's founder and King was one of the last High Elves. But behold, a High Elf fell away, and this Shadow Elf fought against Mothronbor for 499 years. Then the Shadow Elf disappeared, his armies gone. Some believe the Shadow Elf still lives to this day. But that is unknown. As of now, Mothronbor and his kingdom are preparing to defeat the Orcs, and are prepared if the Shadow Elf suddenly does return.