Thrawn's Revenge is a large-scale mod for Empire at War: Forces of Corruption. It includes the events of the Galactic Civil War after Palpatine's death at Endor, up until the signing of the Pellaeon-Gavrisom treaty. If you own the Steam version of EaW, you will have to complete extra steps to run the mod after installation. Please see the manual for these steps.
People keep asking if they can build the minor factions' units if they capture the planets of that faction. We don't think that's a good way to handle it for several reasons, so instead we've made it so that when you capture specific planets you get certain immediate benefits; in the case of Hapes and N'zoth you get Hapan and Yevethan units respectively.
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