In the game, Kratos comes across big and metalic enemies known as Automatons, which use a metalic gear as their weapon of choice. The Gear also has a second function as a key. Kratos acquires a gear everytime he defeats an Automaton and puts it at incomplete mechanisms to open doors or activate certain structures. Like the Automatons themselves, the Gears were created by Lanaeus to serve as pieces of big structures around the game, and specially in Atlantis.