Mhun are actually an offshoot of humanity, though this was not known until Nicator came across Moghedu (read more about this in the history of the Selucarian Empire). When Glanos and Sahart, and their followers, left Ceylon, they took more than half of the human population with them, including most of the best and brightest. Further devastating the Ceylonese was a terrible plague that hit a few years later. Those who survived the plague were forced to leave Ceylon forever, for fear of a repeat of this tragedy.

Journeying to the great Mhojave desert, they spent a year there, with the idea that the great absence of moisture would purge the plague from anyone still carrying it. When they felt that the plague was likely gone from any of them, the ones that had survived it and the unfriendly conditions of the desert began looking for a place to settle. They quickly came upon a vast series of caves and caverns directly to the southwest of the Mhojave and in this place, which they named Moghedu.

Though Moghedu was a more hospitable place to live than the desert was, it was no paradise. Water and food were both scarce, though food, at least, could be obtained by venturing out and hunting desert creatures. Over the years and generations, the humans who had settled there began to evolve in response to their environment, becoming distinctly different from the rest of humanity. They took on a gaunt and leathery appearance due to the lack of moisture and generally did not grow to the same size that a normal human would. As the elders saw the younger generations growing further apart from humanity, they decided to call this new race of beings Mhun.

The Mhun did survive, and were able to eke out an existence once their biological changes were complete. They learned to raise and eat various underground creatures, and learned to capture moisture from the rocks themselves, though they still were often thirsty and water was considered the single most valuable possession. The discovered vast veins of precious metals in the deeper parts of their caverns and they mined these, though even gold and diamonds could not compare to the value of water.

Life for the Mhun was hard, and they became hard themselves. Having no time for pity, they often left the infirm to die, and it was expected that the elderly among them would journey into the desert to die, so as not to become a burden to their families. Time went on and little changed in Moghedu, until the day when Nicator discovered them, and everything changed. That, however, is a story for another time.