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As the New Republic was still recovering from their near defeat by Thrawn, Imperial remnants began reuniting under an enemy no one thought they would see again — Emperor Palpatine, who had come back from the dead through a combination of Dark Side magic and cloning technology. Palpatine’s Dark Empire, as his army would be called, would launch a campaign to not only destroy the Republic but also achieve universal domination through the Dark Side of the Force…
(Dark Empire did it better)