The Malice series of campaigns for Dark Heresy 2E Synopsis

So I realized parts of my campaign make no sense without the background of why they are happening and I'll finagle a fanciful-worded essay as I am wont to do later but for now a simple info drop.

For this series,
the Chaos god Malal existed. It was the god of banality and the recursive nature of Chaos similar to 1E. It was as strong as the other gods and grew along with them. The other gods destroyed it. However, the essence was too powerful to be annihilated completely. It congealed over millennia into the form that is known as the pandaemonium. At one time, a xenos race who were the original rulers of Askellon almost found a way to get rid of it. They were corrupted and their empire spread to ash. They exist now as the dwellers of ancient xenos ruins known as the White Ones. The Pandaemonium, even with its warp storms that swallow planets, was relatively chained by that race's rituals that preceded their failed attempt to destroy it. Then an agent of the Tarot; a Chaotic alliance of Slaaneshis, Khornates, Tzeentchians, and a mix of renegades, mercenaries, and mutants; performed a ritual at an ancient ruined city seemingly in stasis known as the Pristine City. This ritual eliminated the chains of malice (hence the original name of the campaign series) and now the pandaemonium is rearing its head more powerfully than before and more importantly now vulnerable to the ancient xenos weapon simply known as the Theoclast. Along with the breaking of the chains is a narrowing in the divide between the immaterial and the material allowing for increased phenomena and facilitated rituals to summon abominations from the warp along with other harrowing effects. The series of campaigns is the result of the efforts of the Tarot and along with them the Dark Eldar kabals, Nurglite cults, and the Inquisition's race toward control of the Theoclast with interference by Craftworld Eldar, cults of Chaos Undivided, genestealers, and horrors best left undisturbed. With the Theoclast is the ability to absorb the power of a god for the foolhardy, the use of it as a weapon that can rend the galaxy, or dissipate it entirely and eliminate the pandaemonium and stabilize the warp around Askellon to turn it from a doomed sector to a possible citadel in the coming centuries.

(When the Imperium Nihilus occurs and it is one of the few places not affected because I don't do nihilistic cosmic horror feel-bad bullshit where everyone's efforts were in vain).

Also yes I did get this idea from that one episode of If the Emperor had a Text to Speech Device but transplanted it to 2E's pandaemonium rather than 1E's tyrant star.

The campaign takes place 200 years before Cadia's fall.