The foundation of all Iron Horde technology is a primitive, coal-fired centrifugal engine which can be used to turn wheels, belts, and chains, allowing for the construction of crude vehicles and siege weapons including tanks, cannons, and chariots. The Kor'kron Iron Star, an early, unmounted version of this engine, was first unleashed by orcish siege engineers during the final battle of the Siege of Orgrimmar, and it is this technology that Garrosh smuggles into the past. The Kor'kron Iron Star was incorporated into the final encounter with Garrosh during the Siege of Orgrimmar specifically to foreshadow the Iron Horde.[1]