Legacy: Life Among the Ruins has a really neat move for The Serene Choir Family playbook, called Divine Grace, which lets you essentially write your faction's holy texts commandment by commandment over the course of the game, based on the actions you take, the actions taken by other characters, and the emerging fiction. It's a neat way to guide your own idea of what your faction values, as well as providing an emerging set of rules that might dictate how your characters are likely to act - and what they might be tempted to go against.