At Lord Level 18, the Mystery Shop will be added to the Smithy. Items in it can only be purchased once per listing, though the same item may be listed several times. The array of items changes once every four hours, starting with the player's first login of the day. Not all items that are offered here are really a bargain. Especially for gear of white quality, the merchant tends to charge a higher price than the regular production price.
Each upgrade level of the Smithy requires you to already have a City Hall at the same upgraded level.
Construction time may vary between players, depending on their Construction Level and Political Points.
To construct a level 1 Smithy, players must also have at least one Barracks at level 3.