The fiction book Between Two Fires by Christopher Buehlman looks like it would be good inspiration for the game. Just a part of the description: "The year is 1348. Thomas, a disgraced knight, has found a young girl alone in a dead Norman village. An orphan of the Black Death, and an almost unnerving picture of innocence, she tells Thomas that plague is only part of a larger cataclysm—that the fallen angels under Lucifer are rising in a second war on heaven, and that the world of men has fallen behind the lines of conflict." Something to read while we wait for the game.