Adventures at the Dawn of Civilization
From the introduction:
The land of Kengir is loosely based upon the land of Sumer, during its heroic age, before its conquest by Sargon of Akkad in 2350 BC. It is not intended to be an accurate representation of that land, or its history, but simply a campaign setting that gives the flavor of Sumer in the days of Gilgamesh. In early Mesopotamian literature, Wizard and Rogue characters were virtually unknown, and Priests were not often shown as ‘adventurers.’ As such, wide latitude was taken in fleshing out this setting.
Kengir is located on the world of Ki, a comparably young, and backward world. Few civilizations have developed on Ki, and fewer still have reached a bronze age level of technology. Kengir’s religion is fully developed, thanks to the advanced nature of their gods, but the art of magecraft is much less developed than in many campaigns.