Gold mine

This building allows you to obtain the resource: Gold. It doesn’t require other buildings.
Building higher levels of the Gold mine increases your production of Gold.

Iron mine

This building allows you to obtain the resource: Iron. It doesn’t require other buildings.
Building higher levels of the Iron mine increases your production of Iron.

Lumberjacks

This building allows you to obtain the resource: Lumber. It doesn’t require other buildings.
Building higher levels of the Lumberjacks increases your production of Lumber.

Farm

This building allows you to obtain the resource: Food. It doesn’t require other buildings.
Building higher levels of the Farm increases your production of Food.

Dwellings

The dwellings increase the number of the population you can have in your castle. It doesn’t require other buildings.

Barracks

This building allows you to train soldier units. In the barracks you can train : Pikeman, Swordman, Axeman, Maceman, Shortbow archer, Longbow archer, Crossbow archer. It requires Blacksmith(2nd level) and Marketplace (3rd level).
Building higher level of the barracks allows you to train new soldier units and to do that in a shorter time limit.

Stables

This building allows you to train soldier units. In the stables you can train: Quickwalker, Light cavalry, Heavy cavalry, Archer cavalry. It requires: barracks (5th level) and Blacksmith (5th level).
Building higher level of the stables allows you to train new cavalry units and to do that in a shorter time limit.

Workshop

This building allows you to build siege artillery. In the workshop you can build: Ram, Ballistician, Catapult, Trebuchet . It requires Blacksmith(10th level).
Building higher level of the workshop allows you to train new siege machines and to do that in a shorter time limit.

Marketplace

This building allows you to send resource to other players , to make offers about resource exchange or to accept other players’ offers. It doesn’t require other buildings.
Building higher levels of the marketplace increases the number of merchants in it, therefore the quantity of the resources that you can trade with.

Blacksmith

This building allows you to better your soldier units’ characteristics( attack against infantry, attack against cavalry, life). It doesn’t require other buildings.
Building higher levels of the Blacksmith shortens the time it takes for an upgrade to finish.

Infirmary

This building allows you to “revive” a part of the units that are lost in battle. It requires Dwellings(10th level) and Blacksmith(15th) level.
Building higher levels of this building increases your chances of reviving a larger number of units.

Wall

This building increases the defenses of your castle. Building a wall requires Blacksmith(1st level).

Order

Here are trained the Noblemen, who are used to take over the enemy castles. Other than the Noblemen, The Order trains the special soldier unit of every race. It requires Barracks(20th level), Blacksmith (17th level), Infirmary(5th level) and Stables(15th level) .
Building higher level of the Order allows you to train Noblemen and the special race units in a shorter time limit.

Shelter

This building allows you to hide the resource you have gather when your attacked by an enemy. It doesn’t require other buildings.
Building higher level of the Shelter allows you to hide more resources.

Warehouse

With every upper level of the Warehouses the free space in them increases and you can contain more resources. You start with a maximum capacity of 500 of every resource and developing the warehouse increases the capacity.
It doesn’t require other buildings.