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Learn more about the movers and shakers of Cataclysm at our Faces of Cataclysm page.
http://www.wow-europe.com/cataclysm/features/lore.html

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Cho’gall (Source)
Cho’gall’s sordid history is a testament to his unflinching desire to sow chaos wherever his dark influence extends. The first of the ogre magi, Cho’gall rose to prominence in the old Horde as chieftain of the orcish Twilight’s Hammer clan. His dubious loyalties became apparent when he abandoned the Horde during a pivotal moment in the Second War. In retaliation, forces dispatched by Orgrim Doomhammer slaughtered most of Cho’gall’s traitorous clan, forcing him and his surviving cohorts into hiding. Over the following years, the ogre mage molded the Twilight’s Hammer into a fanatical cult devoted to worshipping the Old Gods — ancient harbingers of the apocalypse. Cho’gall’s obsession with these malefic deities led him to the ruined city of Ahn’Qiraj, where he began efforts to awaken an Old God by harnessing the immense powers of Med’an, the new Guardian of Tirisfal. Ultimately, Med’an thwarted Cho’gall’s plans, and the scheming ogre mage was thought slain. The Twilight’s Hammer, however, has remained organized, leading to fears that Cho’gall is still alive… and merely biding his time, waiting for the right moment to make his presence known once again.