Fading Suns (Second Edition or Second Edition Revised)

Nobility, priesthood and guilds use intriques and weapons to rise in power in a brittle peace that is maintained by the emperor. Humanity's technological height has been centuries ago and much is lost in old wars. Space is home to unkwown horrors. Intergalactic travel is made possible by huge space portals made by an ancient race (or two races?) that seem to be gone a long time ago. A symbiot infestation threatens the life of everyone. Alien races play their role in the game of power - being abused by the powers that be and being a power themselves.

And suddenly the suns are fading and the end comes neigh.

This is the world of Fading Suns that I really love. I also like the rules of 2nd edition. A new edition is on its way.