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The Air Caste of the Tau traditionally functioned as messengers, but now fill the ranks of the Tau Navy (Kor'vattra), working as pilots and starship crews. The Air Caste lives almost entirely off-world, and as such have developed long, slender limbs, but possess a skeletal and muscular structure of reduced strength. Prior to the unification of the Tau castes, the Air caste were said to possess membranous wings, allowing them to glide on warm air currents. The Tau use the titular prefix of "Kor" to designate someone of the Air Caste. They are amongst the least encountered of the castes, presumably because of their reduced muscle mass and duties within the fleets and the empire, unlike the water and fire castes who more often operate outside of the empire.

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