The Burning Legion reestablishes it's presence as a threat as the Doom Lord Kazzak reopened the Dark Portal to Outland , surging Azeroth with all the revenge hungry demons from the Burning Legion. Journeys from the Horde and Alliance, strengthened by their new blood elf and draenei allies, using the gateway to end the intrusion at its origin. On Outland's shriveled lands of the Hellfire Peninsula, the Alliance uncovered many of their heroes that had crossed from the portal a long time prior , although the Horde made connection with the Mag'har - 'uncorrupted' orcs that had not taken part in their race's initial intrusion of Azeroth. The adventure into Outland pulled Horde and Alliance military even more into conflict with the agents from the Legion as well as lieutenants of Illidan Stormrage, that had claimed the shattered realm for his very own.