Editing MedHammer 40,000 (section)

===The Tau===
[[File:MH40kTauPropaganda.png|50%px|thumb|left|Propaganda poster with the Attillans, a key Auxillary of the Tau'Va.]]

Calling themselves an Imperium after their former masters, the T'au Va were originally part of a subject state of the Imperium called the "Cerulean Socii." That changed when the Eldar, concerned about the Imperium's growing strength and success, saw an opportunity to create an ally that could counteract the Imperium without further altering the Warp. Thus the Ethereal caste was created through advanced genetic modification as a way to indirectly control the T'au Va.

Taking advantage of a Black Crusade that distracted the Imperium, the T'au Va revolted against their overlords and slaughtered their Imperial overseers and [[Kroot]] intermediaries. Before the Imperium could mount a proper counteroffensive, the Eldar "chose to ally" with the T'au Va and announced that the newly free T'au Va were under their protection. Unwilling to fight a war with the Eldar Craftworlds in the middle of a Chaos insurgency, the Imperium begrudgingly agreed to a ceasefire.

Despite the T'au Empire's small size, it is meticulously organized: the four former T'au nations were transformed into castes. The T'au possess highly advanced weapons but rely on their Eldar "allies" for aid in travelling vast distances.

The T'au have seen many different Ethereals who unite them — from the original, now-expunged Ethereals, to an era of Water Caste government, to the rise of Commander Puretide, and the increasing dominance of the Fire Caste. Under O'shasanuk'la the T'au have carved huge swaths of the Ultima Segmentum and are now circling the borders of Ultramar.