Mardum (also called "Mardum, the Shattered Abyss") was one of the major worlds inhabited by the Burning Legion. Illidan Stormrage sent his Illidari here just prior to his defeat in the Black Temple in a bid to strike at the Legion. This world fragment is the starting zone and comprises the bulk of the beginning demon hunter starting experience in World of Warcraft: Legion. The focus of the demon hunter mission is to wrest control of the Sargerite Keystone from Sargeras's most trusted demonic followers and oust erstwhile leader Brood Queen Tyranna .