Corruption includes 12 new planets: Dathomir, Mandalore, Hypori, Myrkr, Felucia, Honoghr, Kamino, Mustafar, Muunilinst, Saleucami, The Maw, and Utapau. The skirmish mode includes maps for the new planets alongside the previous maps, with the optional feature of having a third player on the map. The Galactic conquest mode includes new planets, with the added feature of non-conquest goals.

Corruption also introduces the ability to position structures and units on a planet's surface, pre-select starting units during space or ground battles, mobile build pads and transport ships for ground battles, the ability to repair space station hardpoints, and orbital bombardment from capital ships. The Rebel Alliance and the Empire receive new units and changes to existing ones. Crowd-pleasers include Rancor riders, surviving Droidekas and, if a 'slavery' mission is performed on the forest moon of Endor, suicide bomber Ewoks. It also has a mish-mash set of original units: A ring of raiders, renegades and ruffians eventually expands to eclectic exotic equipment as the Consortium appropriates everything it can lay its hands on. Several mission types cause a small battle. Its specialty is 'corruption': it can conquer planets traditionally, but also gain bonuses from enemy-controlled worlds by having its infiltrators conduct any of several kinds of missions such as bribery, sabotage or piracy. The Consortium has a full-fledged campaign that is set in the background of the original film trilogy. The Zann Consortium is a new faction, neither good or evil, but willing to go to any lengths for a profit.

Pirates had previously been present in the game, but as a type of moderately-armed 'speed bump' to progression in the war between Empire and Rebellion.

Star Wars: Empire at War: Forces of Corruption adds the organized crime syndicate the Zann Consortium as a third faction. A screenshot of the Galactic map during gameplay (playing as the Zann Consortium) showing multiple planets under an effect of corruption

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