
Soon, the leader of the plain warriors was persuaded to parley with the Tau of Fio'taun. One made his way into the camp of the plain Tau, exuding a quiet authority that no Tau was able to resist. As the tide of the siege turned, two mysterious Tau appeared. However, disease and starvation began to take their toll. For five long years the inhabitants held off the savage assaults with their thick walls and plentiful cannon. Though negotiation had been attempted, the fierce plain warriors would settle for nothing less than the annihilation of Fio'taun. The Tau builder fortress city of Fio'taun was under siege by an alliance of warriors from the plains and air Tau. ĭuring this time, the Tau legends tell of the first appearance of Ethereals at Fio'taun. The Tau were on the verge of wiping themselves out. Each year thousands died, squalid conditions and lack of access to fresh food and water created a plague that killed more Tau than were dying in the wars. The numerous wars that broke out lasted for years. These fledgeling skirmishes led to the darkest period in Tau history, the Mont'au during the end of the 37th Millennium. During this time inter-tribal conflict escalated.

The Tau of the river valleys developed the first fortresses and crude blackpowder weapons to ward off the aggressive Tau of the plains. įor some unknown reason Tau technological advancement preceded at unusually rapid rate then would be expected for a newly emergent race. This continued for 6,000 years, making the Tau's homeworld utterly inaccessible. Before the planet could be cleansed and colonized by the Imperium, however, a violent Warp-storm erupted around the planet. During the 35th Millennium, an Adeptus Mechanicus Explorator fleet Land's Vision, had discovered the Tau homeworld and determined that its population were a primitive people at the Stone Age level of development who had mastered the use of primitive weapons and fire. The development of settlements led to the need of trade, and wandering Tau began to negotiate and mediate between the disparate tribes. The Tau of the river valleys developed agriculture and metallurgy, forming the first true settlements.

The Tau of the mountains developed the ability to soar high above the baking deserts on thermals.

The Tau of the plains became strong and skilful hunters, larger and stronger than most other Tau. As their race aged, they expanded to all environments of T'au, adapting to each new environment. In Tau prehistory, they lived in tribes on the desert plains, hunting and gathering their food. The exact date of founding of the Tau empire is unclear, however the reasons behind its foundation are. It has suffered many raids from the Orks, and also seems to lie in the path of several splinter fleets of Hive Fleet Kraken. The Tau empire borders the Imperium, and lies within the reach of the Astronomican. Several alien races ( Kroot, Vespid, among others) have allied themselves with the Tau. Founded by the Ethereals, who lead the Tau empire in the name of the Greater Good. The T’au Empire (or Tau Empire) is a rapidly expanding empire situated inside of the Ultima Segmentum, near the Eastern Fringe.
