| Availability: All Civilizations|
Function: Trains Champions, Trains Siege Units, Trains Heroes, Has Special Technologies and Siege related Research, Advanced defensive fortification (which can be garrisioned to further improve firepower).
The Fortress is a building that can be constructed in the City Phase. Fortress is a strong building that can be garrisoned with up to 20 units although capable of defending itself without a garrison. In addition each infantry unit garrisoned adds to the Fortress's firepower against enemy units approaching it. A Fortress also provides 10 extra housing for your civilization. Many Champion and Siege Units can typically be trained in the fortress.