The GM Simulation Expansion PDF is out NOW for Those Dark Places. This FREE addition to the original book offers ideas and examples for aliens and monsters in your TDP game. There's adventure hooks, too.
In this book you will find some guidelines on how to introduce the ‘unknown’ to the game; alien horrors, cosmic terrors and eldritch wonders. There will be a few new rules to help you incorporate these things into a session as well as adventure ideas to get you moving so you can let… things loose on the players.