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Cataclysm returns players to the two continents of Azeroth for most of their campaigning, after years away in Outland and Northrend. New zones opened such as Mount Hyjal, the sunken world of Vashj'ir, Deepholm, Uldum and the Twilight Highlands. It includes two new playable races: the worgen from the legendary kingdom of Gilneas for the Alliance, and the goblins of the Bilgewater Cartel from the isle of Kezan for the Horde. Flying mounts are usable in Kalimdor and Eastern Kingdoms, and the new secondary profession Archaeology is introduced.