The Anunnaki are a secret society in the Cosmic Era
A systemic power during the galactic war
Created for a freedom fighter situation where a group's purpose is to liberate provinces or citizens, or to simply escape to regroup later.
What is the justification for the nobility? Some appeal divine authority. In one world however, being of noble blood really does elevate you above the common rabble. By virtue of magical aptitude.
‘The more you tighten your grip, Tarkin, the more star systems will slip through your fingers.’
Princess Leia, Star Wars - 1977
The heart of Humanity, the Starkin Federation is the largest faction of Man amongst the stars, the mightiest vehicle of his ambition.
If you want to add a "supernatural" touch to your campaign, define the rules of magic and the universe. Make your players comfortable with those rules. Then your new supernatural creatures must then break those rules.