“Mutant cults? You’ve discovered that there may be some mutant cults in the mines? There have always been mutant cults in the deep tunnels! The difficulty isn’t ‘discovering’ that they exist—it’s ‘discovering’ ways to cull enough of the filthy scum to keep them from overrunning our homes and butchering us in our beds!”

–Captain Thibalt Psarkin, 2nd Regiment, Pellennian Deep Guard

Pellenne is one of the Grand Worldsof the Askellon Sector. It is crucial to the sector’s economy, not only by virtue of its tremendous mineral resources, but also by dint of its vital strategic position. It sits squarely along the Grand Processional, the primary Warp tributary linking the sector’s Grand Worlds in relatively stable travel paths. The Processional permits access to the sector capital, Juno, with Warp journeys between the two worlds lasting only scant weeks. In addition, Pellenne sits at the centre of a local web of lesser Warp-routes to a number of Low Worlds within the Stygies Cluster, and acts as a jumping-of point for spinward-bound traffic exiting the wider sector.

Pellenne is a large planet consisting primarily of high-purity unprocessed iron. The iron is not mixed in with rocky ore, or locked below a crust; rather improbably, the entire world appears to be the cooled core of a far larger former planet. It has a thin atmosphere, which at surface level has been heavily polluted and is barely capable of supporting human life. For this reason, human society on Pellenne is almost entirely subterranean.

The planet is riddled with gigantic tunnels, most over a kilometre wide and some much larger. All run for hundreds or even thousands of kilometres in meandering, apparently random courses through the world. Some drop vertically from the surface to unfathomable depths, while others form lazy spirals that slowly meander towards the core over tens of thousands of kilometres. All eventually lead downwards. The tunnels appear to have been cut through the iron during some ancient era, using vast boring machines that have now vanished. There has been much speculation
as to the source of these channels; the official explanation is that the tunnels are wonders of the Dark Age of Technology, created by the legendary first Askelline settlers during Mankind’s distant times. However, some have pointed to the difficulty of accurately dating the passages; there is also quiet speculation in some quarters that they are far, far older and date back millions of years to some unspecified pre-human culture. The planet’s gravity hovers around one Holy Terran standard; despite the planet’s vast size, this implies that much of its mass may have been removed by whatever created the vast tunnel network that pervades the world.

The planet’s unusually elevated radiation levels, atypically, do not appear to derive from the Pellennian system’s own star, but from the planet itself. Radiation levels increase with proximity to the core; at the surface they are raised, but tolerable. In the lowest tunnels they can become quite lethal. The source of the radiation has never been satisfactorily explained, and few are anxious to journey into the lower depths to discover it. Given this, the iron mined on Pellenne should be highly radioactive; however, this is surprisingly not the case. While the iron exhibits high levels of
radiation at depth near the core, it somehow loses this quality as it is brought to the surface in a phenomenon not fully understood by the Adepts who have studied it.

Such an environment is inimical to human habitation, and as such the planet’s surface outposts and extensive subterranean cities are well-protected with void shields and other protections to ward against the horrific efects of rad-corruption. However, much to the dismay of the planet’s long-term inhabitants, mutation rates among the population remain unusually high, even within the richest and best-shielded noble enclaves. Why this should be the case is a growing concern to senior figures within the world’s ruling classes. Some have suggested that the mysterious radiation source deep at the planetary core emits energies undetectable by the traditional rad-augurs, energies which have the efect of mutating human genetic material. The preachers of the Adeptus Ministorum cry out that high mutation rates are a sign not of some physical or genetic taint, but of a spiritual malaise brought about by lack of faith in the Emperor. Certain Inquisitors worry that the truth of the matter lies somewhere between these two extremes, and fear that at the heart of the planet lies some object or being which is somehow twisting the planet’s human inhabitants into new forms.

Pellenne possesses two small moons. One, Brax, is rich in rare silicates while the other, Leem, is a carbon moon rich in titanium carbide and diamond. Such a combination of geologically distinct bodies in a single system is highly unlikely in planetary formation. The question of how such conveniently exploitable resources came to be in their current location has such worrying implications that few Pellennians are inclined to delve into the matter too deeply, however. Both moons show the same evidence of mining by boring machines of colossal size during some
unidentiiable previous period. There is a third, artificial moon, Facility Rho-Kappa 213. This large orbiting smelt yard is operated by the Adeptus Mechanicus under the terms of a centuries-old mutual benefit charter entered into with the current Pellennian ruling dynasty. Beyond these, the space above is remarkably free of orbital bodies and debris.

Pellenne’s resources are crucial to the operation of the entire Asskelline economy. It annually exports hundreds of teratonnes of pure, high-quality iron for use across the sector, together with large quantities of rarer minerals and ores from its moons. The reliability and consistent supply of iron generated by Pellenne has made it a world of importance; unlike other resource worlds, there is no sign of Pellenne’s natural bounty exhausting itself at any time in the future.

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Plutonic Power

Pre-Imperial records relating to Pellenne are scant, but all extant documentation—spanning thousands of years—consistently describes it as a mining world. Pre-Imperial commercial contracts retained by the ruling dynasties indicate that the planet’s initial human population was small, a long-vanished caste of peripatetic interstellar mining clans using a high degree of mechanisation. Over millennia, as the skills necessary to maintain their equipment were lost and their leets of ragtag starships eroded, Pellenne’s rulers became more and more reliant upon vast numbers of unskilled labourers shipped to the planet from adjacent inhabited worlds.

Pellenne corrupted these labourers; mutation ran rife among those toiling in the deep tunnels, even among those who took all precautions to ward themselves against the virulent radiation found within. For as long as there have been humans on Pellenne, there have been mutants and outcasts clinging to existence in ramshackle towns outside the shielded tunnel-cities, eking a miserable life from the effluent seeping downward from above them. The arrival of the Imperium made little diference to the planet’s utilisation; indeed, it only hastened the planet’s reliance upon offworlders. Locking this imported labour into hereditary contracts of indentured servitude—to do the jobs the resource-rich Pellennian ruling dynasties were not prepared to do themselves—was the next logical step.

Life Underground

Given the number of indentured workers (who vastly outnumber the natives), the planet’s culture retains a rather rough edge, despite its antiquity, and Pellenne still feels like a frontier world. As on most Imperial worlds, the majority of its inhabitants do not experience art, leisure, and the advantages of civilisation. Pellennian society remains highly stratified, with little interaction between social classes. The planet’s rulers, a class of interrelated (and often inbred) noble families known as the “Dynants” live in heavily shielded towers on the surface, protected by dozens of regiments of ferocious Enforcer-soldiers—the Deep Guard. The Dynants are aggressive exploiters of the poor of the Stygies Cluster, enticing them to the planet with promises of honest paid work, only to then tie them in to contracts containing unachievable mining targets. Every year, hundreds of thousands of naive workers arrive in Fornix, Pellenne’s great subterranean capital city, to discover that they must carry out decades of backbreaking work in highly radioactive mines. There are tales of some managing to eventually leave, but they are more hopeful myth than fact.

The planet exacts a toll on those who work there; mutation rates, especially among those who work closer to the planet’s core, are frighteningly high, despite extensive rad-shielding. Any worker exhibiting signs of mutation is dismissed immediately, exiled from the protection of the great tunnel cities, and driven into the vast and ancient Mutant Pellennian underclass.

The Twisted

No one knows exactly how many mutants there are on Pellenne. Since time immemorial, they have lurked at the edges of human society, "feeding upon its refuse and watching its inhabitants with envious eyes". In recent years, as many of the great excavation machines have begun to malfunction, these outcasts have assumed a greater economic importance; each mine’s overseer now musters them together every work-cycle in their thousands and herds them into the deepest mines, where they hack away at the bare iron with hand tools in exchange for meagre scraps of food. Those wretches closest to the currently-worked mines and tunnel cities, a group consisting largely of recently-mutated indentured workers desperate for survival, are still utterly dependent upon human society. These desperate exiles occupy hastily-assembled shanties, and jostle for
the scraps thrown to them by Pellenne’s untainted population.

At a remove from these unfortunates are the descendants of earlier Outcasts. These more experienced mutants are less servile and more resentful of their lot. Prone to forming ruthless, exploitative, and secreted bands with their own gang-cant, they are opportunists, entrepreneurs, and innovators, establishing their own constantly-evolving culture. The movers and shakers of mutant society, they operate tattered drinking dens and seedy outposts, many of which are the grandest buildings in the under-towns. These crime lords and ladies, agitators, and thugs are responsible for many ill-fated uprisings against the cruelty of the Dynants over the centuries.

At yet a further remove is a third mutant community. This is by far the most poorly-understood population, consisting of those mutants who, in ancient times, led deep into the lowest and oldest tunnels. "A primeval and preternatural attraction to the depths has always drawn the most mutated. Every year, as if at some secret signal, thousands of mutants wander into the darkness in ones and twos. Many die, their desiccated corpses littering the dark, spiralling tunnels. Yet many seem to find others of their kind, there living a peculiar, almost tribal, existence, feeding upon each other and the strange mould that glimmers wetly in the darkness".

Here, strange societies bloom and fall, far from the eyes of the Imperium, worshipping and sacriicing to hidden gods. Here the spiral mutants breed and plot, waiting patiently for the day when their numbers are so great that they can rise up from the deepest tunnels and "drown the light of the human cities in eternal darkness". One day, soon it appears, their time will come despite the futile efforts of those above to eliminate mutants from Pellenne.