Once upon a time, there was a spiral galaxy...
The spiral galaxy had several arms, and the presumed origin of humankind was a small solar system on an insignificant spur arm -- SolPrime. With the discovery of qubition and the development of Quantum Entanglement Drives, humankind traveled among the arms.
Sadly, humans also invented q-bombs. That explosive potential combined with the reckless dissatisfaction that fueled our journey to the stars resulted in this:
With three-quarters of the Salty Way destroyed or inaccessible, humanity has retreated to the Obsidian Rim -- the dark, dangerous but (maybe) survivable remains of the galaxy.
Stay inside the Rim and stay alive. Hopefully...
Special Thanks to Elsa Jade for creating and annotating the above graphics
Where have humans colonized? Below is a growing and changing map of the rim based on the novels as they are written. This is updated three times per year.