After defeating the Orcish Horde and capturing the survivors, the Human Alliance attempts to destroy the Dark Portal. However, whilst they destroy the portal, the rift that joins the Orcs' world of Draenor to Azeroth remains. The Alliance forces decide to enter the rift to the Orcs' home world to attempt to seal it from the other side. At the same time, Ner'zhul - Warchief of the Shadow Moon clan, who has seized control of the Orcish hordes of Draenor following Orgrim Doomhammer's departure (and eventual defeat) to Azeroth, plans to send his forces to Azeroth to gather magical artefacts in an attempt to open rifts to other worlds.