Reading over the game rules, the races, the religions, and the maps should give you a pretty decent idea of what kind of theme that we’re going for here. Peth is a world that is built vertically, with 4 elementally-themed tiers being the easiest way to divide the world up. The peoples exist in a tense but largely steady equilibrium between the never-ending army of evil Tar Men emerging beyond the ocean, and the ever-steady resources being shared throughout the world to maintain the army to fight them.
I don’t need to write too much here, it’s all in the link. Maybe now I can work on comics on my lunch break instead?