You may find this interesting taken from the
GW website,
http://uk.games-workshop.com/tau/oshovah/ O'Shovah has become the greatest enigma of the emergent Tau race. In a society renowned for its dedication and sense of duty he has
become a renegade and defied the ruling caste, the Aun, or Ethereals. In the aftermath of the Imperium's abortive Damocles Gulf Crusade in 742.M41 a Tau Fire caste commander, Shas'o Viorla Shovah Kaius Montyr, led an expeditionary force which
broke away from the main Tau empire and established a series of fortified Tau colonies at the far side of the Damocles Gulf. The underlying reason for the split has intrigued certain (admittedly obscure) scholar-adepts in the Imperium for centuries. As more information has come to light the actions of Commander Farsight have become the source of grave concern for certain members of the Inquisition who perceive a distinct threat to the Divine Rule of the Emperor of Mankind.
Firstly, Tau forces for the Farsight enclaves have frequently acted as mercenaries, selling their considerable martial prowess to any aggressor willing to pay the price in raw materials they demanded. Secondly, intelligence from within the Tau empire has identified Farsight 'sympathisers' within the ranks of the Fire Warriors, those who claim to understand the actions of the renegade commander in the context of the Tau central tenet of faith, that of acting 'for the Greater Good'. Thirdly, the place where it all began holds deep and dark significance.
Inquisitors fear that O'Shovah and the colonies he established have been corrupted in some way. Members of the Ordo Malleus naturally sway towards the insidious influence of Chaos as being at the heart of it, citing the likelihood of a possessing daemon or accursed artefact, or even a silver-tongued worshipper of the Ruinous Powers planting the seed of corruption in Farsight's expedition. Those of the Ordo Xenos contend that xeno corruption is just as likely, Tyrannic organisms have been known to overthrow entire civilisations from within by subversive genetic corruption. Likewise there are many known alien entities which are capable of enslaving other races – parasites, vampires and symbiotes which can control their hosts or prey.
The Ordo Hereticus see O'Shovah's actions as those of a crisis of faith, a crumbling of ideology. They believe something caused O'Shovah to question the very basis of the powers he served. For some reason, perhaps revenge or power lust, fear or disgust, he made the fateful decision to use his personal power to betray his masters and strike out on his own. Treachery begets heresy, so they also fear something as insidious as corruption by an idea, and that if the Tau prove vulnerable to disruptive concepts many more will follow his path with unpredictable results. To date there is no record of Tau with psychic powers, but such an uncharacteristic change in motivations and personality may also indicate O'Shovah being awakened to some power of the wyrd buried deep in the Tau psyche.
To many in the Tau empire itself O'Shovah is a virtual non-entity now, an old soldier that disappeared in to the void and never came back, one among many in the histories being written of the Tau's expansion. For the Tau it is a time of heroic endeavours, and the apparent end of one has obscured successes of others. Those who know of the Farsight enclaves seldom speak of them. When they do, O'Shovah's sympathisers emphasise the impossibility of returning across the vast region of the Damocles Gulf after his pursuit of the Orks to their lairs after ten years of battle and pursuit. His fiercest detractors fear this is a sign that the Fire caste harbours a desire to overthrow the Ethereals and rule the empire in their stead. Almost nothing is known of the distant enclaves in recent decades,
but there are persistent rumours that their mercenary forces have even clashed with the Tau empire, a truly repellent concept to the devoted followers of the Greater Good.
"Each must find their own way, if those in our heartland had witnessed the savageries of the void as have we they would know this. The hand of each of the great starfarers is turned against the other, none will join their strength together just to see their ancient enemies prosper. Neither should we."
-Attr Commander Farsight 765.M41
