Draenor was torn apart when the Orcish leader, Ner'Zhul (later the first Lich King) opened dozens of portals to other worlds in an attempt to escape the invading Alliance Armies from Azeroth. The sheer number and combined power of the portals ripped Draenor into fragments and cast the remainder into the mysterious parallel dimension called the Twisting Nether, Home of the Demons. The remnants of the world are now known as Outland, and feature in the last mission of the human campaign of Warcraft II: Beyond the Dark Portal (though, without any actual terrain changes), Warcraft III: The Frozen Throne and more prominently in World of Warcraft: The Burning Crusade.
