From the publisher:
The Anunnaki left behind many strange devices and their ancient secrets lie buried on many worlds "secrets which can bring salvation" or destruction. But they and their works are not the only mysteries, for strange entities lurk in the void, tempting human and alien alike to enact their schemes against the civilized order. Monsters of science and superstition harass and haunt the Known Worlds, from devastating war golems to ghosts of the wartime dead. A number of sentients walk in the shadows of consciousness: enigmatic psychics, heretical Sathraists and demon-worshipping Antinomists.
The Dark Between the Stars details many of the entities and forces involved in the supernatural universe of the Fading Suns.