Deep within Blackrock Mountain, the black dragon Nefarian conducted twisted experiments with the blood of other dragonflights. Intent on seizing the entire area for his own, he recruited the remaining Dark Horde, a rogue army that embraced the demonic bloodlust of the old Horde. These corrupt orcs, trolls, and other races battled against Ragnaros and the Dark Iron dwarves for control of the mountain. Nefarian created the twisted chromatic dragons and a legion of other aberrations in his bid to form an army powerful enough to control Azeroth and continue the legacy of his infamous father, Deathwing the Destroyer. Nefarian was vanquished by the heroes from the Horde and the Alliance.
Seven expansions have been released: The Burning Crusade, released in January 2007; Wrath of the Lich King, released in November 2008; Cataclysm, released in December 2010; Mists of Pandaria, released in September 2012; Warlords of Draenor, released in November 2014; Legion, released in August 2016; and Battle for Azeroth, released in August 2018. Players are not required to purchase expansions in order to continue playing; however, new content and features such as higher level caps and new areas may not be available until they do so.

^ "The Activision/Blizzard Merger: Five Key Points". Industry News. gamasutra.com. December 3, 2007. Archived from the original on December 21, 2008. Retrieved February 24, 2009. One of the intriguing things about the old Vivendi structure was that, even when Martin Tremblay joined to run Vivendi's publishing, it was specified: "World Of Warcraft creator Blizzard Entertainment has been designated a stand-alone division reporting to VU Games' CEO, and is not part of Tremblay's product development mandate.
Tras los eventos narrados en Wrath of the Lich King, Arthas ha muerto, y la guerra en Rasganorte parece haber terminado, ya que la Plaga está controlada por Bolvar Fordragon, convertido en el nuevo Rey Exánime, el carcelero de los malditos. Pero entonces, misteriosos terremotos comienzan a sacudir toda la faz de Azeroth, y poco después, comienzan una serie de ataques elementales contra las capitales de la Alianza y la Horda. Estos ataques son el preludio del resurgimiento del Dragón Aspecto corrupto Alamuerte, que las destruirá, extendiendo su dañino poder por los dos continentes. Cinco años después, en los que se suceden los eventos narrados en la novela World of Warcraft: The Shattering, Ventormenta y Orgrimmar están en proceso de reconstrucción, y la faz del mundo en Azeroth ha cambiado por completo tras los ataques de Alamuerte, que han reducido a cenizas algunas zonas y han provocado violentos maremotos y terremotos que han partido literalmente la tierra en trozos, inundando algunas zonas y haciendo resurgir otras. Alamuerte ha vuelto con un solo objetivo, el de destruir Azeroth, y no se detendrá hasta conseguirlo.
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