Completing higher missions gives authorization to use improved technology and higher-order weaponry unique to each House, ensuring varied game play. For example, House Harkonnen may be able to construct their "Devastator" tanks with heavy armor and ordnance but cannot build the similarly impressive Atreides "Sonic Tank". The Ordos have access to the "Deviator" - a specialized tank firing a nerve gas that switches the allegiance of targeted units to Ordos for a limited period of time. The three Houses also are restricted in their production capabilities—House Ordos cannot build Atreides-style trikes, instead making the faster "Raider" trikes, while House Harkonnen constructs heavier but more expensive quad bikes.