You stand on the ship's bridge, dried xeno blood still covering your hands. Below, long sleeping protocols desperately attempt to jumpstart the tombworld back into wakefulness as they sense the threat, but it is far too little, far too late. You cackle in unhinged glee at your own genius as the planet swallows itself, and then reality screams to your mystical senses, as the warp impinges on the materium. Another tear has been created in the ever more frayed barrier.
The Dark Gods are pleased, and you feel sweet sweet power filling your frame to overflowing. Ecstasy! You body writhes as you begin to lose whatever humanity you had left, arms becoming eight crystal tentacles, eyes becoming a dozen eyestalks, legs hunching down like of goatman even as supernatural muscles ripple all over your body. Most importantly however, you feel your magic surging, reaching such heights that you can truly call yourself the greatest sorceror in the galaxy! You feel the warp opening up to you, as you see more clearly than you ever have before. You understand the flow and can command it! All will hear the name of Juda Valgoroth and know despair!
As you ponder your next step, you enter the pulsating flesh-laboratory of your resident Magos, Arkon. A massive pile of exotic organs, with occasional plates of machinery implanted seemingly merely for Dark Mechanicus aesthetics. You're unsure how much of what Arkon is, is the result of his own tinkering, and how much is merely mutations from the blessing of the Dark Gods.
Several eyes roll in their sockets to look at you, as a rumbling hum emerges from somewhere inside the mass of flesh, "Ah yes, your Arcaneness, good to see, good to see. You have finally began to abandon the obsolete humanoid paradigm. Good! Good! Must come by for fine-tuning later yes? The subjects you have sent me, astounding. Promise so much possibility."
You rub some tentacles together eagerly at this, a rictus of anticipation gripping your face, "Yes, yes! I've been thinking about that. What if we like, use this to sort of pump a lot of chaos energy into the orks! Think about it Arkon, Chaos Orks! The galaxy would burn!"
Arkon trembles uncertainly at this, wisely wary of disappointing you, "Difficult, difficult. Attempts have been made to subvert the Emerald Storm before. All failed. This one would dare to speculate that the orkoid deities directly stomp down on any such attempts. If you could guarantee that the Gorken Morken duality was focused elsewhere, we might perhaps attempt this. But even so, difficult. Orks may appear simple and crude on the surface, but their biology is... insane. Yes, insane"
You wave him off airily, "Okay nevermind that then. We'll revisit the topic later. We could corrupt the gene-seed of a Space Marine Chapter, plunging them to the side of chaos!"
Arkon waffles at this, "Can do, unlikely to be cost-effective. Party trick unless on similar scale to Horus Heresy"
You begin to frown, Arkon always lacked vision, "Create my own space marines! Better than those shoddy ones the corpse-emperor made! Born from chaos instead of lured into it! Psykers all of them! They will cleave the heavens!"
The Magos hesitates a while on this, as your scowl becomes progressively worse, warp lightning beginning to crackle at the tip of one of your tentacles, "Possible! Space Marines have always been limited by narrowminded focus on humanoid paradigm of corpse-god or the lack of Materium considerations of Dark Gods going too far in the other direction. Perfect hybrid! Can do. But, quality would take time. Several decades to get a proper legion going."
You hum thoughtfully, not quite the 'instant psyker super-army' you were hoping for, but good enough for now you suppose. But still your fertile mind boils with ideas! "Creatures that inject a serum into my enemies, pumping them full of chaos mind control spells, corrupting them into loyal chaos cultists! Useful both on and off the battlefield! It could be like those Tyranid Gene Cults!"
Arkon is beginning to look at you oddly you think, though it's difficult to tell with him, "As long as you handle the magic side, sounds simple enough, but same forces that monitor for Gene Cults would likely notice the physical changes these 'corruptors' would bring. You are of course aware that sufficient strong willpower can resist mind-control spells, but the fact that they become incorporated into the beings very flesh should increase the difficulty several times over. Could add additional biological alterations to increase mind-control effectiveness, at cost of decreased subtlety."
You snort dismissively, "Don't think to lecture me on my own craft Arkon. But speaking of Tyranids... could we use something similar to the hypothetical 'corruption serum' to control an entire Hive Fleet! The power!" You begin to salivate at the thought of the might you could command.
Your read on Arankor tells you he appears conflicted, shuddering in excitement but also gurgling in hesistation, "Yes! No! Maybe! Lack effective infection vector to take over an entire fleet. But a single ship? Yes. Tyranid vital flaw has always been slow space travel. Subvert a single ship, give them... biologic warp engine? From seed grow new Hive Fleet! But...
Attempts to control, contain, study Tyranids, all ended badly! Might recall this is how lost home Forgeworld and came to serve you! Great reward, great risk! Must also remind Sorceror Juda that is only one Magos. If focus entire attention, may perhaps accomplish one of these projects to satisfaction. Assistants, perhaps even colleagues would help greatly."
As the fleets begins to ready itself to enter the warp, you lounge on your screaming throne, pondering your next move
[X] To build a better Space Marine: If you're gonna do this Juda Marine Legion thing, you're going to need two things. A absolutely massive population base of elites to draw recruits for enhancement from, and plenty of samples of both conventional and chaos space marines for Arkon to copy gain insight from. The first will be accomplished easily enough by conquering some Daemonworlds, while the second will require you to hunt down the most dangerous prey, Space Marines, and take their bodies largely intact. A difficult proposition at the best of times, and space marines aren't exactly common, but you aren't the most powerful sorceror in the galaxy for nothing!
[X] Unstoppable Hive Fleet: The sooner you get started on this, the sooner you will be commanding an ever-growing swarm of hyper-adaptive super-predator bioships. Need to go hunt down some splinterfleets, get a handle a handle on Tyranid biology, and finally do the deed. Step 1, locating the Tyranids, will be childsplay for you, as your magicalness allows you to easily spot their shadow on the warp. You begin scribbling in your journal about ways you could join directly into hivemind, making you even more of a psychic giant than you already are. Surely there is no way this could go wrong?
[X] The Chaos was inside you all along!: Gotta think long-term here Juda. Sure the Corruptors might not seem all that glamorous now, but it'll be significantly more impressive once you've dominated the entire Imperium! The Inquisition? Bah, I can take em.
[X] Write-in?