Genghis Khan "went to great and terrible lengths" to create it to ensure that the Mongols kept control of Warehouse 7. Its power is protection and cannot be destroyed by conventional means. In an emergency, it is the last defense for Warehouse 13. Can be removed and transferred to another person with a golden key. The shackle can create a force field around the Warehouse, sealing everyone inside and keeping danger out (or the other way around if neccessary), and will disappear when the danger has ended. It also opens an escape route to the Regent Sanctum in Hong Kong.