With the Overlord DLC for Stellaris, you will be able to realise your own “grand plan” of the universe. More precisely: The addon is dedicated to your role as liege lord of the galaxy and the possibilities in dealing with your vassals. Or you can become a vassal yourself and let yourself be ruled, because that should also become a valid option with Stellaris: Overlord.
Stellaris thus continues to build on its solid foundation and is becoming more and more of a heavyweight among 4X strategy games.