Excerpt from the Catallax book, The Pilgrim’s Guide to the Conflux:

Hundreds of years ago, three great civilizations discovered not only that they were not alone in the universe, but that they weren’t even the only humans. The Isan, Malleon and Feron each hail from different, distant corners of the known space, but they all share the desire to expand, to explore. Are there yet more humans, out there in the vast black? Or have we finally concentrated all life in one solitary system?