When the Tribal Square is motivated, its production is doubled, and one refined good of each type from the building's age is produced in addition to the coins already produced. The coin production is boosted by enthusiastic population and by boosts of certain Great Buildings. The building can be plundered if it isn't motivated. This building requires a road connection.
It is a result of InnoGames' attempt to make rewards from Guild Expeditions unique, thus replacing the Oasis as a GE reward. Its properties are identical to the Oasis.
The Tribal Square can be obtained from the Uncommon Gold Relic during the Guild Expeditions. It can also be obtained as a reward for completing the last encounter of level II and the 12th encounter of level IV of the Guild Expeditions.
The Tribal Square can be upgraded by Tribal Square Upgrade Kit item. To upgrade the Tribal Square, use the Tribal Square Upgrade item on the Tribal Square that is already situated in your city. Its upgraded version will then be placed directly on the same spot in your city and the production timer will not be reset. Note that the upgraded building will be from your current era, even if the old one was from one of the earlier ages.