So I read this at a description. Have to say, as a setting I love it and I absolutely would love to play the game.
Here is a trap though, you have a brilliant setting, but setting is the easy part. How will this become a story, where is the twist? If you don't plan ahead for this a little bit then there is a risk that the story just runs out of ideas and peters out once you reach the war.
So what could happen? You have a lot to work with ...
So basically what I am doing here is going through every sentence of your setting and thinking how could the story change this.