This series is amazing if for no other reason than the ambition! They actually use GURPS (a dungeon and dragon like dice system) to decide important events and

This series is amazing if for no other reason than the ambition! They actually use GURPS (a dungeon and dragon like dice system) to decide important events and write the story based on the results, also the two dudes who created the world are PhDs in Archeology and all the different cultures are based on actual human civilizations.