The Tau Models are a relatively young humanoid race who are extremely technologically advanced. They believe in the greater good and claim to be a peaceful people. If opposed however, they will resort to violent action. The Tau use a caste system to control society but everyone is viewed to be part of the greater good.
Fire(Shas)- Is the military caste in the Tau Empire.
Earth(Fio)- Laborers and Technicians, and also artisans, scientists and engineers.
Water(Por)- Composed of Merchants and Diplomats.
Air(Kor)- Funtion as messengers and make up the Tau Navy.
Ethereal(Aun)- ARe the Political and Religious leaders of the Tau.