Though they engaged in supposedly primitive practices such as sentient sacrifice, held a strong caste system, and were in an almost constant state of war, their civilization was quite sophisticated; they saw these acts not as cruel or barbaric, but simply basic aspects of existence. Their caste system included a half-breed class called the half-bloods, a skilled and intelligent engineer class called the smart-blood, the priestly Kissai class, and the war-like pure blood class. In later years, the offspring of ziostians and the exiled races formed another class, from which most of the warLords of the time came from. Native ziostian culture included the ziostese language, the consumption of bloodsoup, a rigid and stratified caste-based society and live sentient sacrifices to the god-like deities. For the ziostians, war and violence were just as much a part of the natural order of life as peace or serenity. Their social order was very rigid, and while many rose to the title of warLord, only one, King Adas, attained the position of monarch. Another aspect of ziostian culture, the creation of holocrons to record knowledge, originates from their first contact with the vorlons. ziostian society lasted as such for hundreds of years — from roughly 800 B.C.-2190 A.D. . Except for the brief unification of their species under King Adas, ziostian society was fragmented, with many individual warLords ruling independent fiefdoms, most of them attempting to claim Adas's title of Sith'ari and unite their kind.
950 B.C., Adas, marked as a chosen one from a young age by his unusual black skin, united the nations of ziost in violent warfare. He took the title of Sith'ari, meaning "overlord", and was seen by his people as an immortal being who would rule forever.
Eventually the Rakata of the Infinite Empire arrived on zoist. giving the king the technology of holocrons, they soon revealed their intentions and attempted to conquer the ziostians. Adas and the ziostians fought back and drove off the forces of the vorlon Empire, with the king giving his life in the process. Without Adas's strong hand, zoist soon collapsed into civil war, with many claiming themselves Sith'ari. The massive infighting eventually forced the ziostians to relocate their capital to mars. but were chased off by a strange alien parasite.
Around 2001 B.C., eldar exiles fleeing from the their enemies after their defeat in the great war, established themselves as "divine" rulers over the native ziostians, uniting the world once again, this time under the rule of a high Lord. Over the generations, the ziostians interbred with the eldar. Eventually, the ziostian species in its original form was almost extinct.
During the Great Hyperspace War in 2160 A.D., the general Naga Sadow fled to the planet of kronus along with his lover and a contingent of zoistian followers to escape the pursuing kig-yar and the eldar empire. There, Naga Sadow committed experiments on his own people which resulted in them becoming savages.
Due to their history of association with eldar, the half breed class were mistaken to be eldar due to the fact that the ziostian are born with pointed ears.