A cyber-gothic role-playing game for mature players.
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Chaos
The material universe is but one aspect of reality. There is a quite separate and co-existing immaterial universe. This is commonly known as the warp or warpspace, although it is also known as Chaos, the otherworld, the ether, the empyrean, the void and the immaterium. Warpspace may be explained in terms of an endlessly broad and deep sea of raw energy. This energy carries within it the random thoughts, unfettered emotions, memory fragments and unshakeable beliefs of those who live in the material universe — it is the collective mind of the universe itself.
All living creatures exist in warpspace as well as in the material universe, although most are not conscious of the fact. Just as a man’s body inhabits the material universe, his soul inhabits that of the warp. The body is part of the universe and made of matter: the soul is part of the warp and is made from the stuff of raw Chaos. Human sensitivity to the warp is not generally well developed. The soul itself is not aware: it is simply a coherent lump of Chaos energy maintained whole by its anchor to the material body. However, in a minority of people this sensitivity is far more finely tuned. These people are psykers and they are able to consciously control and use the energy of the warp to affect the material universe. There are many kinds of psykers, not all of them Human, some of whom are tolerated or encouraged within Human society while others are regarded as dangerous and are actively persecuted and destroyed.(From GW Space Hulk: Genestealer 1st ed).More information.
The Metaphysics of Necromunda
Necromunda's people are religious and genuinely pious. The Ministorum tries to enforce its hegemony upon the population by controlling the life-support. As a result they can demand tithes and orthodoxy. Most people belive strongly in the Emperor-God and lives their lives in hopeful fear that they will join Him in Heaven. Yet the Ministorum cannot control such a vaste population. In many Spires their authority has been replaced by religio-military schismatic groups who preach similar, but significantly different doctrines. To what degree these groups are heretical varies across the Hives, and only the Ministorum can determine the answer. These schismatics are not dangerous so long as they keep their congregations eyes on the True God, the Human-Lord.
But the break-down of the Ministorum's theocracy allows room for more sinster religious activities. Most Hivers are ignorant of the Daemons that exist beyond the thin veil that separates the realities of Real-Space and the Warp. Even fewer know of Chaos. Instead, the Imperium's enemy is understood through the story of Horus the Great Betrayer.
Though most Hivers know the story of The Great Betrayer Horus and the Emperor, none know that it was here on Necromunda that Horus Himself was corrupted by Chaos. Dissedents, seperatists, mad-men and genetic deviants, all those who have nothing to loose and hatred in their hearts may turn their faces from the Lord of Humanoty and worship that dark name used only to horrify. The worship of Horus, the man who in the minds of all humans embodies evil, betrayal and heresy, is in actuality the worship of Chaos Unified, that force which seeks to control, destroy or toy with Humanity. Furthermore psykers with weak minds may hear the whispers of Daemons in their dreams, or even become possessed. These dangerous factions are found throughout the Imperium, yet here, on Necromunda, such heresy is influenced by a power that is closer to the souls of the people living here, due to the parculiar and dangerous metaphysics of this area of the galaxy.

Those who have studied the ways of the Warp will not be able to tell how it has happened, which came first. But it is evident to those few who know that Necromunda, that dying world, is lost not only in body, but in soul.
Nurgle - The Final Abyss
The Chaos God known by many as Father Nurgle presides over Necromunda. Truely, it is His Cess-Kingdom, not the Emperor's. Though the Master of Mankind tries to keep a grip of the minds of his children here, their environ sees to it that their energies are spent escaping and embracing death. This paradox, this denial, this final futility, this is what Nurgle the Great Abyss embodies. He is the Lord Of All, for everything will finally decay. He is the End, the Final, the Equilibrium which everything will eventually reach, the cold constant of a dead universe millions of years from now.
The constant struggle of a Hivers life makes him or her a strong warrior, but the rusting decay of their homes, the foundations of the Hives, slowly sinking into the mire that surrounds them, the sanitised cannibalism of the Re-Cyc., the deadness of the natural outside life, the artifical horror of the tomb-like Hive-Cities, all of these things affect the bodies and thoughs and hence the very souls of the humans here. The struggle to live, to defeat death everyday, yet to experience the banal futility of their violent existence means that the Hivers share the common spirit of that Rotting God they help to grow in power. This daily hope, this daily procrastination of the inevitable, the ultimate misery of this scarred, collapsing world makes this Nurgles realm, and Nurgle is most powerful here.

Perhaps it is this deathly psychic effect of the minds of a million million humans engaged in this futile existence that has weakend the thin barrier between reality and the Warp. Over the millenia, as the social and environmental situation of Necromunda has got more desperate, this thin line between Nurgle and the humans on this world has wavered. If the psychic emanations of the struggling humans has not been the cause of this seeping corruption, than perhaps the area of the galaxy where Necromunda lies was already metaphyiscally weak. Much like the Eye of Terror is a vast gap between the two realities, here the gap has not happened yet, but the dividing line is not strong. Little holes appear in the lives and souls of Necromunda's population. In any case, it is a downward spiral, a vicious circle. The more endangered the Hivers become in their great cities, the more desperate and death-bound they are. And the more desperate they are, the more endangered by Nurgle they become. This being the case it is more likely that, if chaos cults do occur, if possession does happen, the Daemons will be Nurgles, the cults will worship Him. It is very easy to fall into this trap. Consequently, it is difficult for anyone to worship Tzeentch the opposer of Nurgle as the Hopeful, the Changer, though His powers are weak here.
Those Tech-Priests that study the ancient Lore and Scriptures concerning the Laws of the Universe understand this one-way decay of Reality. The Tech-Priests understand that energy in the universe is indestructable and constant, but is does change in quality. A man from ancient times called Clausius was said to be inspired by the emperor when he wrote of his discoveries. He expressed the Death of All as a fraction: heat divided by temperature. When a quantity of heat flows out of a hot body, its entropy decreases by the amount of heat divided by the original temperature of the ot body. when the same quantity of heat flows into a cool body, its entropy increases by the amount of heat divided by the original temperature of the cool body. Since the temperature is larger in the first case and smaller in the second, the fraction of entropy decrease is smaller than the fraction of entropy increase; thus a net gain of entropy occurs in the transfer. This gain occurs every time heat flows from a higher to a lower temperature, and since nothing interesting or useful happens uness heat does make this descent, all interesting and useful things are accompanied by an irreversible increase in entropy. The ancient Clausius summed up his conclusions in his famous couplet:
The energy of the universe is a constant.
The entropy of the universe tends to a maximum.
All this can mean is that eventually all of the the heat in the universe will be spent and become cold. Everything will be reduced to solid lumps of undifferentiated cold, a homogenious mass of almost nothing, where nothing happens, there is no change, no reaction, no reversibility no organisation and every biological thing is dead. This Great End is inevitable, the universe will drift as a sea of endless cold and it is Humanity's and other galactic species' consciousness and unconsciousness of this that gives Father Nurgle his LustMord, his energy.

Necromunda stagnates. Its people, its cities, rot and decay. It is in a rut, heading down one line to oblivion. It lives from its waste, nothing is left. Its Hives sink due to their own weight, onlyto build higher, only to stave off the inevitable end. The Red Giant glowers in the sky, threatening extinction. all the while the planets people try to get away, build away from the planet, into a poisoned, deathly sky. Lost and exhausted, Necromunda will one day succum, either to the natural or human-made disasters that threaten it, or to the psychic shock-wave of horror and acceptance that will one day spread through the vulnerable freshly psychic minds of an unprotected people, a people trapped in the cold lifeless gut of Nurgle, The Inevitable Abyss, He Who Waits.
Tsen-Tsin - Daemonprince of Tzeentch
Tsen-Tsin is one of Tzeentch's Daemonprinces. It is powerful enough to have many followers and an bestow its own particular gifts and corruptions upon them. Tsen-Tsin feeds primarily on, and supports those, who fight against Nurgle. As a result, Necromunda is of great interest to him, and of all Tzeentch's daemons, Tsen-Tsin is the most powerful here.

Like most daemons of Tzeentch, Tsen-Tsin is uncaring as to the changes that undergo his champions. Any change is good, whether it is weakening or strengthening. Tsen-Tsin does not understand the aspirations or ambitions of mortals, simply that they have them. It understands only change, so Nurgle and Necromunda's people are anathema to it.

Tsen-Tsin is extremely intelligent and can forsee possible futures. It is especially concerned with time, as time is the ultimate enemy because it ends. The end of time brings the reign of Nurgle. Tsen-Tsin's ultimate daemonic aim is to destroy linear time and scatter all endings and beginnings into an inchoate flux, where a final end cannot possible occur because there is no movement towards it. However Tsen-Tsin is also considering a compromise. Causing time to become circular would stave off the End by bending Time back-upon itself, result in an infinite ciruit of life, death and re-birth. The continual of the life-cycle would satify the Daemon prince & its Master Tzeentch.
These are mighty ambitions, but such is the nature of Tzeentch's daemon princes and their desperate struggle against final dissolution.