Koronus and Calaxis

The Calixis Sector and Koronus Expanse are located in the Segmentum Obscurus a division of the Galaxy by the Imperium. Located North of Holy Terra, it is the center of Chaos incursions from a massive warp rift known as the Eye of Terror.


The Calixis Sector is a sector of the Imperium within Segmentum Obscurus. The Calixis Sector is a relatively young sector in terms of the history of the Imperium, having been founded from the worlds conquered during the Angevin Crusade that ended in the early centuries of the 39th millennium. The Calixis Sector is ruled by Sector Governor Marius Hax from his seat of power on the central hive world of Scintilla, and the realms he governs in the Emperor’s name stretch from the coreward worlds of the Markayn Marches, Josian Reach, and Hazeroth Abyss to the Malfian Sub-sector and Drusus Marches which border the unexplored expanses of the Halo Stars and from which Rogue Traders and Explorators venture into those haunted and uncharted worlds.

~ Rogue Trader core rulebook, page 337

Koronus Expanse

The Koronus Expanse is the name given by Imperial authorities to a dangerous unexplored region of the Halo Stars beyond the Calixis Sector. The Expanse is accessed through the Koronus Passage, a treacherous but navigable route through the great warp storms that bar 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 ancient doom.

The Koronus Expanse in the the 41st Millennium is a scattered, partly explored region containing a few young colonies and vast natural wealth still barely exploited. Rogue Traders vie with one another for known resources, heedless of lives lost in the pursuit of riches, while a tentative attempt at Imperial colonisation follows in their wake. Drawn by the flow of wealth, pirates and servants of the 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 dead hands, while the Expanse itself holds many secrets and native inhabitants no less dangerous.

Footholds have been built close to the few semi-stable warp routes into the area. Here, resource-rich worlds are exploited, xenos ruins excavated, trade envoys meet with heathen lords, and colonies are attempted upon sheltered worlds. This effort has been enough to shower wealth and fame upon the fortunate—and make corpses of the rest. The gateway to the Expanse is littered with broken vessels and tales of the vanished.

Beyond these human conflicts lie truly dark and dangerous voids, rife with rumoured terrors, undiscovered stars, and worlds of men 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.

The warp space of the Koronus Expanse is treacherous and unknown in the main, and the partially explored regions of the Expanse are islands of Imperial activity amidst a vastness of danger and mystery. Navigating is a far cry from traversing the established warp routes of the Calixis Sector. Most of the Koronus Expanse is known to the Imperium only though legend, revelation, and hearsay.

~ Rogue Trader core rulebook, page 336

Halo Stars

The Halo Stars are the stars surrounding the galaxy. The stars comprising the halo are very old and dispersed very thinly across the approximately two hundred thousand light years of the halo’s diameter. Some are grouped together in clusters. The halo is almost entirely unexplored.

Koronus and Calaxis

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