It is said that Aun'Va is the oldest and the wisest of his caste. He has counseled the greatest leaders of the Tau for longer than any can recall, and his hand can be seen at work behind much of Tau history. He is the most senior Ethereal upon T'au, sitting upon the councils that rule not just the sept, but the entire empire. His word is heeded by every member of his caste, for his counsel has ever proven wise and true.
But Aun'Va is not merely a spiritual leader, for in history there are many instances of him leading the Tau expansion from the very beginning of the conquest. His presence gave the Fire caste the will to rid the Si'coa system of the hateful Reek, his words sending them into a righteous rage. Upon the flanks of Mount Scion he pronounced the fate of the Orks of the Waaagh! Grognik — a sentence that was efficiently enacted by ten thousand Fire Warriors.
Aun'Va stands as supreme Ethereal within the newly won septs of the Third Sphere, Shadowsun ever loyal at his side. Across half a dozen new worlds, a million Fire Warriors and many more colonists stand ready to sacrifice all upon a single word of their beloved Ethereal, the Master of the Undying Spirit — Aun'o'T'au'Acaya'Va'Denta.
- Codex: Tau Empire (4th Edition)