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 Oasis as a GE reward. Its properties are nearly identical to Oasis, except that Oasis's coin production is not doubled when motivated.
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.