Cursed abattoirs are pretty baller. Even without demons and witchcraft, an abattoir fed through the 40k "supersize it" scale would be horrifying to behold. This being 40k and all, how would you play the long term consequences of finding out the nobility may have been eating people?
Like with corpse starch, I always imagined it was like the recycling tanks from Alpha Centauri. Biological matter (waste, people, animals, food discard) all gets mushed and grinded, mixed in with a fungal mat which is then finally processed into the bars of corpse starch. But if the upper class have been eating meat directly, and labourers have been found dead in the meat lockers of meat supply meant for the upper classes... That could be a plot hook for something that is a lot darker and wider reaching than one rogue witch. Love the scenario
Also currently I'm just spitballing for evil mechanicus ideas. What do you all think for these? I want to go big because my players' characters still don't know what the chaos gods are, so this is a real opportunity to show the four in their best light. Especially since I've got 7 different flavours of evil mechanicus to colour the shades in
My conception of the Magos is that they are a Magos who divided their organic brain into 8 pieces, supplemented by cogitators to fill the gaps. Some remained loyal to the creed of Mars, some have shed the shackles of ignorance in totality, whilst others have fallen to one of the chaos gods. They have spent their life running the Alchemys division, whilst conducting top secret research into xenotech/warptech with powerful, shady backers in high places. So I want to keep everything close to the theme of "purifciation/distillation," "changing of states/metamorphosis" with lots of tech revolving around phase tech, warp tech, transitioning states of matter, elements or making weird compounds and isotopes. This is for a very high XP ascension campaign so I can really go crazy with the lethality, my only limiting factor is I want 90% of the projects to be things someone could plausibly believe would help the Imperium/Humanity/Omnissiah before they lost their mind with the remaining 10%. This should give plausible plot timer countdowns to saving planets before the doomsday events happen
The Convection Cough
This one I want to give to the seventh shard, Septimus Divinatus, rebranded as Centimus after they metamorphosed into a giant depressed centipede. Having fallen to Nurgle's worship, Centimus has created the Convection Cough. I don't really have a strong idea for how this disease will work as I just thought it was a baller name for the kind of thing an evil mechanicus nurglite would make. My current idea is:
1. The initial infectious stage. Coughing & sneezing occurs here.
2. Many die from the cough. A few survive and get better. The unlucky few survive and proceed to stage 3.
3. At stage 3 those unlucky survivors steadily increase in temperature with every cough until their innards are hotter than a blast furnace, their every cough spreading pestilence with the searing heat, yet unable to die from their own flames. Such poor victims are immobile, and usually end up welded to whatever surfaces they lay down to rest upon. Their surrounding environment gets colder and colder the higher the concentration of convection cough victims are, as the warp plague works like Laplace's Demon, reversing entropy into its victims.
Centimus's end goal is to use a whole bunch of convection coughees to fuel its metamorphosis into a beautiful daemon prince butterfly. I imagine this project was originally a benign attempt at understanding the secrets of an ancient plasma drive salvaged from a nurgle-blessed warship.
Idk how to make this an interesting scenario for players though. Maybe have them respond to an urgent request from an Ordo Hospitaller mission, showing a city slowly being overrun by the convection cough. I also don't think I would show a lot of the usual nurgle stuff, to keep it focused on his themes of entropy/change instead of his usual theme of guts and bloat. So I'm thinking the main challenges for the players to deal with would be:
-Deciding the fate of population centres suspected to be affected by the Convection Cough.
-Dealing with panic caused by hacked vox towers broadcasting Nurgle's message of despair and protection + the aftermath of the Ordo Malleus trying to kill everyone who heard the broadcast.
-Finding Centimus.
The Virtual Panopticon
This one I want to give to the paranoid, schizophrenic and future-seeing Tertia Divinatus, now fallen to Tzeentch. I'm imagining a gigantic circular tower where the Magos is wired in the middle, with the walls just covered in giant eyes that bore into the souls of everyone within the building. The building itself is full of rows upon rows of stolen psykers, raided from a Telepathica Blackship.
Scenario-wise, I'm thinking the virtual panopticon would be an opportunity for players to fight some really wild, gnarly enemies. Since the virtual panopticon can conjure forth very angry warp holograms, I can make fights that would otherwise by canonically impossible. Need to work on this one though, since I don't know what the hell a Magos that can see the future would do with this knowledge. I'm thinking of a tragic kind of take where the Magos peers into the future and in every instance, they see their own failure, and are desperately searching for a way they can succeed and save a forge world from destruction. Tzeentch being Tzeentch, is glad to show them trillions of simulations all ending in failure, but with each attempt getting closer to success. Could have very fun interactions with the player characters
The Autochthon
This one I'm giving to all of the Divinati fragments. The Autochthon is a Servitor inspired by the Obliviate, in the sense that they are all the same thing, but the Imperium is horrified by one but not the other for arbitrary superstitions. The autochthon is a servitor programmed with a complex imperative to make more servitors. When released upon a planet, they will begin converting the existing populace into more autochthons, before commencing the construction of greater factories. If left unchecked, they will just keep going. Don't really need to change anything, the Imperium's use of servitorisation is already nightmare fuel - though the autochthon is slightly more nightmarish, with no attempt at pain relief, purification, ritual or lobotomisation attempted. Highly offensive to the Mechanicus, Ecclesiarchy and generally everyone as a result. Also a great way to have a recurring common enemy on multiple planets that all serve as a calling card indicating "ah shit our heretic target was on this planet." This one is pretty insidious as it can plausibly have been an experiment that factions in the Imperium could feasibly tolerate employing. I think Orthodox Mechanicus officials would be disgusted at the idea of servitors acting autonomously and violating sacred rituals, but Imperial nobility or more radical Mechanicus officials may view the Autochthon as an efficient tool, furthering their spread.
The Apostosic Circuit
It's just a warp-tech device that summons demons and then vaporises them with plasma coils, over and over again, recording the fluctuations in radiation and warp energies. I'm sure a Magos could very well weaponise one, harnessing its warp energies for something nefarious, or just using it as a daemon 3d printer.
The Haemorrhage Principle
The workings of Quartus Divinatus, twisted by Khorne into a patient, stalking, arachnid-like predator - whilst retaining an intellectual, eloquent and patient personality. A book, a scroll, a holovid, a binaric screech, the Haemorrhage principle is a meme-virus that lodges in the minds of its audiences, posing a question. Those that receive the principle but fail to solve it will eventually spotaneously exanguinate. Solving it entails essentially modifying yourself until you become a brass living weapon of war, just as Khorne intends. Just love the idea of a gigantic murder-machine sneaking into libraries and leaving copies of his literature, with the potential for the principle getting mass broadcasted resulting in an exterminatus level threat on a par with the convection cough or apostosic circuit.
The Steel that Itches
I can't quite think of any doomsday Slaaneshi-Mechanicus projects that fit all the criteria of "good intentions gone wrong" + alchemy theme. I think the Slaaneshi Sextus Divinatus would focus on smaller scale projects on perfecting the Omnissiah's divine form, e.g. if man is made in the image of the machine, create the perfect synthesis of perfect man and perfect machine. Lots of chasing them through a trail of stolen cloning vats, sympathetic hereteks and squaring off against augmented super-nobles