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Developed by the [[Tech-Priest]]s of [[Bakka]] at the request of [[Admiral]] [[Knightsbridge]] in the aftermath of the [[12th Black Crusade]], ''Mercury'' was designed to counter smaller pirate and raider vessels. The design took less than two centuries to construct, and proved to be the fastest Imperial capital ship built in several millennia. The Mercury combines a basic [[Cruiser]] layout with the engineering suite normally used on a [[Battleship]], resulting in a much faster propulsion system that can move at speeds to keep up with raider vessels. The broadside [[weapons batteries]] and dorsal [[lance]] turrets mounted on the ''Mercury'' have a range comparable with [[battleship]], along with a Nova Cannon, allowing it to rapidly dispatch these smaller vessels.{{Fn|1}}