The Stonemason's Lodge increases the durability of buildings (except the village wall) in the capital by up to 300% (10% per level), making catapults deal less damage to buildings. It can only be built in the capital. The stonemason's lodge does not affect the city wall. For travian advice go here. Advice: Players may wish to know that during the endgame, a high level stonemason's lodge is invaluable in helping to rebuff enemy catapult attacks.