The Expanse is accessed through the Koronus Passage, a treacherous but navigable route through the great warp storms that bar the passage to the Halo Stars beyond the way station of Port Wander. As is true of the Calixis Sector itself, the Expanse was untouched by the God-Emperor’s Crusade many millennia ago and so it is a realm of fearsome xenos,treasures beyond imagining, heathen worlds of men, and the echoes of the ancient doom.
The Koronus Expanse in the 41st Millennium is a scattered, partly explored region containing a few young colonies and vast natural wealth still barely explored. Rogue Traders vie with one another for known resources, heedless of lives lost in the pursuit of riches, while a tentative attempt at Imperial colonization follows in their wake. Drawn by the flow of wealth, pirates and servants of Dark Gods have also slipped into the Expanse, eager to cast destruction upon the works of the God-Emperor’s faithful, living by what they wrest from the dead hands, while the Expanse itself holds many secrets and native inhabitants no less dangerous. Beyond these human conflicts lie truly dark and dangerous voids, rife with rumored terrors, undiscovered stars, and worlds of man who have never known the God-Emperor.There are no defined warp-routes, no safe ways through the swirling empyrean. These regions hold the fearsome Ork, the treacherous Eldar, and strange ruins that lie beneath the light of dying stars.