Nefarian is the eighth and final boss of Blackwing Lair.BackgroundNefarian, son of Deathwing and brother of Onyxia, is the leader of the Black Dragonflight on Azeroth. In his human guise, he is known as Lord Victor Nefarius, Lord of Blackrock. Holding the Blackrock Clan and various clans of ogres under his dominion, Nefarian rules from his lair at the top of Blackrock Spire.