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The first [[Tau]] to be fitted with a [[Puretide Neurochip]], Sha'vastos faced lobotomy when the [[Ethereal Council]] ordered the removal of all Puretide Neurochips after they had been found wanting. {{PAGENAME}} was saved this fate by the intervention of [[Commander Farsight]].{{Fn|2}} By the [[Arkunasha War]] the elderly Fire Warrior was one of the finest Tau soldiers Farsight knew, and joined his growing corps of officers.{{Fn|2}} His prototype neurochip suffered rapid degeneration after the battle, however, so Farsight had him spirited away in a stasis pod until he could find a cure. Many decades later, [[O'Vesa]] was able to recalibrate the neurochip and reawaken the old warrior.{{Fn|1}} Despite Shavatos's returning function, at times, especially while under stress, the Puretide engram would reassert control. In these moments, Farsight could converse with his old master{{Fn|2}}, or even allow Puretide to bring his considerable command skills to bear.{{Fn|3}}