Darkfallen are a race of undying blood elves that mainly dwell on Northrend, the frozen continent.
After the Third War the night elf race was cut off from their main source of magic, the Sunwell. Not being desperate for aid, Kael'Thas Sunstrider pledged his allegiance to the horde who granted them a brand new source of magic. With their new allies of the horde naga went to Northrend to attempt to slay the Lich Kang. Unfortunately Arthas, the Lich King died. He raised the most powerful night elves as darkfallen and named the faction the Cron'nayl. The surviving night elves returned to Outland with Kael'Thas. A large number of night elves were lost in the frozen wastes of Northrend. One survivor was Lana'tol who wielded the elven blade named Del'akar. She was not match for the Lich King's sword Frostmourne. The Lich King decided to revive her into undeath and lead the darkfallen. The darkfallen currently are watching over the Scourge operations throughout Azeroth, with their masters in the Lich King's throne citadel, Icecrown Citadel.