Here Be Dragons
Also referred to as The Maw. The Koronus Passage is a stable but dangerous warp route that passes through the Great Warp Storms separating the Calixis Sector from the Koronus Expanse. The Koronus Passage was discovered by a Magos-Explorator of the Machine Cult in the distant past, lost for millenia, and found once more by the Rogue Trader Purity Lathimon at the very close of the 40th Millennium. The passage links Port Wander and the Drusus Marches to the great star Furibundus and the void colony of Footfall.
In the present times the Maw is a rite of passage for Rogue Traders of the Calixis Sector. A Lord-Captain may bear the greatest Warrant of Trade ever seen in Port Wander, but until he harrows the maw and survives to see the raging light of Furibundus at its farthest end, he is no better than a common Free Trader in the eyes of his peers.