I've added some handouts with relevant background information. First, a broad-based look at mythology and history. Second, some details about Ophir, the (probable) starting location for the game. Third, some of the local gods of Ophir. This is all taken from the campaign setting of NOD directly, so anything and everything can be redefined during play. Consider it a baseline. The most important bits of the history are the first and last paragraphs, which I quote here. NOD is composed of dreams. In that regard, it has no geological or cosmological history. It wasn’t, and then it was, and slowly, it got itself crammed with all sorts of fantasy nonsense to entertain and annoy people who like to play fantasy games. In other words, nearly anything could/can be included in the setting. The various lands of NOD, visible on the world map, tend to be based loosely on Earth-historical nations, likewise the gods of said nations. Therefore there's really no reason for clerics in particular to feel constrained by those options, almost any Earth-deity can work. Thus it is in today’s land of NOD. City-states built on the ruins of kingdoms built on the ruins of empires, all threatened by encroaching chaos. For the most part this is the case in terms of world politics. It's definitely the case in the part of the world in which the players will start, were Ophir is the largest and most powerful city-state for some distance. Small baronies, villages, and tin-pot would be lords abound.