The armoury stores military equipment, up to an infinite number from each type. As a result, only one armory can be built. The structure is made of stone, making it impervious to fire and melee attacks. It also has an attached wall section which can be scaled by troops if access is provided. Rolling logs can also be mounted on it.
The inside of your own and other players' armouries (excluding multiplayer opponents') can be viewed with the hover of the mouse.