Some other ideas I might like to incorporate into a game:
A tragic event that changes the world, forcing races and factions to work together who have not before. Multiple races that mistrust/fear each other, and don’t normally come together unless there is a reason. Detailed backgrounds. Some elements of animal mysticism, like Shintoism, similar to Mononoke-hime. Gods and mythological figures that gain power as more people believe in them. Some cooperation, but also some competition between the gods. Earth-based magic, having to do with lines of force and flow, like tides or underground water flow.