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The [[Tau]] society is divided into several groups known as castes; movement between the castesis impossible, and membership in a caste is determined by birth. The castes are a formalized version of the political divisions that once segregated the [[Tau]] on their homeworld of [[T'au]] during the [[Mont'au]] time. The [[Fire Caste|Shas]], or [[Fire Caste]] composes the majority of the TauEmpire's ground-based militaryassets. The [[Earth Caste|Fio]], or [[Earth Caste]], composes provide for the Tau's manufacturing, agricultural, manufacturing and engineering casteneeds of the [[Tau Empire]]. The [[Air Caste|Kor]], or [[Air Caste]], is charged with holding the [[Tau Empire]] together through the [[Kor'vattra]], the [[TauEmpire]]'s piloting merchant and comunicationswarfleet. The [[Water Caste|Por]], or [[Water Caste]], are serve as the [[TauEmpire]]'s diplomats, ambassadors and traders. Finally, the [[Ethereals|Aun]], or [[Ethereals]], comprise serve as "philosopher kings" and guide the other castes as well as [[Tau Empire member-races]] towards the enlightenment of the [[Greater Good]], or [[Greater Good|Tau's leadership and spiritual guidance casteva]].