Demesnes & Domination

Demesnes & Domination is a rules supplement designed to compliment OSR games by allowing players and referees to introduce high level campaign concepts without feeling overwhelmed. Domain rules are managed by the Demesne Turn which represents one month in game where the action at the table zooms out and allow players to choose what to invest their treasure in, engage in Domain Encounters, and make meaningful choices to maintain a settlement's morale before zooming back in to the boots-on-the-ground adventuring the party already does. All of this is done using familiar mechanics that players and referee's already use at their table for easy and quick integration.

(from DrivethruRPG)