@TeoinsanityCurrently, shit is going down almost exclusively in Tor-6.
Recently, the Emperor of the 40K universe died. This caused lotsa warp storms, and because of reasons, these spread to other universes as well. Because of this, Tor-6 was hit by a massive Warp Storm that wiped out most of the planet's population and turned the rest into blood-crazed mutants. There are several characters currently stuck in this Shitstorm.
Valentus is attempting to hold off the invading Daemon for long enough that his allies might make it to the bunker. At the moment 'his allies' has been narrowed down to just Stephen, as all the other people he was protecting are pretty massively dead.
Mithias just recovered from being overtaken by Chaos, just to be turned into a Chaos Mutant. However, because of his particular abilities, he was able to resist the mind-warping effects of Chaos. So he's an intelligent vampire in a Chaosspawn body.
Luigi (not the video game char) is currently attempting to fight Valentus together with a squad of 5 Chaos Marines. And failing.
Rex is currently attempting to attract the attention of a Daemon Prince who was previously mocking Stephen, and get said Daemon Prince to fight the psychic death-tank Valentus.