The Ashen Reach spans approximately 400 star systems along a dense corridor of the galaxy's inner arm — a region rich in rare metals, habitable worlds, and the ruins of at least three prior civilisations that collapsed before recorded history. Current inhabitants know almost nothing about those earlier peoples, except that they built things that still occasionally activate.
Recorded civilisation in the Reach is approximately 14,000 years old. For most of that time, it was unremarkable — the usual cycle of expansion, conflict, collapse, and reconstruction that characterises most settled regions. Six major empires rose and fell. Two attempted to unify the whole cluster and both failed. What distinguished the Reach from other regions of space was the discovery, roughly 1,200 years ago, of a theoretical weapon so catastrophic it was immediately classified by every government that learned of it.
The weapon was called a stellar cannon. It could destabilise a sun.
For 400 years, the knowledge existed but the weapons did not — too technically complex, too morally unthinkable, too politically explosive to actually build. Then three empires built them simultaneously, each believing the others were already ahead. The war that followed lasted eleven years. It is called the Scorching. It ended with dozens of systems incinerated and a civilisation reduced to a fraction of its former scale. The light from those dying stars is still reaching the outer worlds — a slow-moving obituary written in fire.