As the largest region of the Imperium of Man, the Ultima Segmentum was nearly as vast as the other four Segmentums combined. It was also the region most overrun by Xenos forces.
The Segmentum Pacificus was anything but peaceful, storms raged in the Segmentum Tempestus, and even the Solar Segmentum was a bratty girl who could come and go as she pleased. As for the Segmentum Obscurus, in the Imperium Nihilus, it was the cesspool of cesspools.
Just look at what lovely destinations the Segmentum Obscurus had to offer. The Askellon Sector and the Gate of Blood were just appetizers; beyond them were Cartia and Vigilance, home to Armageddon—heavyweights in their own right.
Most of the Imperium's Apocalypse battlefields were in the Segmentum Obscurus. But Hogg's main target wasn't this chaotic region. It was the Great Rift, above the 500 Worlds of Ultramar.
A colossal chasm that had torn the Galaxy in two, the Great Rift was surrounded by countless Chaos forces, including many Chaos rebels left over from the Horus Heresy.
If they wanted to live respectable lives, they had to prove their loyalty—and, while they were at it, plunder supplies from those Chaos rebels. Those who surrendered meekly would be spared; those who resisted to the death would be killed on the spot. They could consider it a contribution to the Galaxy.
Though the Filial Sons Alliance were outsiders and knew little about the situation here, they had Dorn and Guilliman, two local guides. The pair picked out a lucky target for them at random.
"You mean Vulkan's Salamanders are in the middle of the Great Rift?"
"Exactly!" When it came to choosing whom to take down first, Dorn, Omegon, and Guilliman immediately formed an alliance. They insisted that Vulkan was the bastard they had to deal with