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The Colossus is specific to Sergeant Johnson. It is built in the Garage and is Johnson's counterpart to the M808S Main Battle Tank. The Colossus has a small machine-gun that can target any units that are not cloaked, however the main power is in the railgun. The railgun's range rivals that of the Locust, however it has a slow rate of fire and cannot target air units. The Colossus can be upgraded with the stomp ability, which damages and stuns all nearby ground units.