Alright folks, you guys generated some kickass ideas at the very beginning of my campaign that actually got used, so I'm calling upon you once again to aid me in my quest to make my players uncomfortable. My cell went up against their nemesis- Heinrich Kryptmann, a machine shop owner who's the leader of a fragment of a once-great cult dedicated to living forever. He recently got himself a halo device and skipped out of town, leaving his organisation to burn at the hands of the adeptus arbites. When the PC's caught up with him, he kicked their arses, until a freak peril of the warp got the corpse of the cell's cleric possessed by a warp entity. The new host went into battle with the halo-creature, and the cell ran out of the church as it began to sustain significant structural damage. While tailing the remnants of his operation via contacts within the beast house, they found their old nemesis' ship in high orbit above FENKSWORLD. Upon boarding the (small) ship, they found the crew dead, and a babbling, insane Kryptmann, seemingly back to human, babbling about the effects the devices have on people. he was promptly arrested. At the exact same moment, in the cargo hold, they found a stasis cube, containing an unknown lifeform. Upon closer inspection, it was revealed that the lifeform in question was Heinrich Krypmann- with all of the halo devices still implanted, and his flesh warped and alien. This threw the identity of the kryptmann lookalike on the bridge into question, when he promptly manifested enormous demonic powers and killed the crew around him. the two cell members detaining him fled back to their own ship, as did the guys in the cargo hold, while their ship distanced itself from kryptmann's vessel.
Thus far, that's what happened.
Next session, their interrogator, Constantine, will order their ship to open fire on kryptmann's vessel, which will go down and manage a crash landing near hive Volg. They'll have to defuse the reactor before it goes supernova, and establish that both kryptmann and the daemon host have escaped. Kryptmann will seek to make contact with the Beast house (he can pass for human if he's got a robe to cover every inch of his body) who he's done plenty of business with before, in an attempt to secure some xenos artifacts and begin working on creating a force of elite superhumans/aliens, since he now thinks he can "save" mankind. As for the daemonhost? I dunno yet.
Your input, advice, ideas, plans, comments, and questions are requested. Pleeeeease!