This is a Fire Emblem: Awakening AU and so is medieval fantasy. I'm going to try my best to make it easy to understand for non-players of the game. And for those who actually have played the game, I hope you aren't too disappointed because I'm going to be taking out a lot of boring stuff and I'm going to try and change some of those plot-holes, and add some stuff in there too. 

Some other groups will appear because Fire Emblem: Awakening has a lot of characters.