It's mid-high Renaissance (minus the gunpowder) but with scattered "primitive" socieites based on ancient Babylonian/Sumerian city-states and some other ancient earth areas. Most of the world is fairly civilized, but there are many encounters where the modern monotheistic religions encounter folklore and superstition. It's a land of mystery where something or someone has been able to limit the effectiveness of divination magic, making it impossible to do things like scry others to find out what their true motives are. Humanity has taken over the world and through sheer numbers become the dominant species. Each of the other races, including the classic "humanoids" like orcs and goblins, have mostly adapted to this and become assimilated to human culture. They worship human gods and follow human customs and live in human cities. Small pockets of traditional non-human cultures exist, and that helps to create the main themes of the campaign: tolerance, the "sense of entitlement", and racial tensions. The fact that no one can use divination magic to spy on their other races, like they used to, just fuels the fire even more. Lastly, because the three major world religions are all monotheistic, it creates a lot of conflict because each religion has clerics that cast spells, and yet none of them are able to figure out how exactly the priests of the rival "pagan" religions are able to cast spells, since they know that the god they themselves worship is the "one true god". They just can't wrap their heads around that.