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The Cyberdemon is the last boss of Doom RPG. It is the Harbinger of Doom from Wolfenstein RPG.
The Cyberdemon was created by the evil mastermind Kronos by combining human technology with flesh. Like the Harbinger, he is missing one arm and one leg as a reference to classic version.
The Marine successfully shut down the portal to Hell, stopped those responsible for creating the portal, and saw to it that the Cyberdemon received a proper welcome to our dimension.