Songs of Light and Shadow
Rules of the Game
Background & setting
Setting elements can be found over at Birthright.net. Anything you find here supersedes info there in regards to this campaign, and I will be adding more here as time permits. Take what you find there is INSPIRATION, not writ in stone.
Also, ignore rules info there. What they have is set up for d20/3e D&D, and of little use given we are using a mix of D&D5e, OSR and D&D 2e.