As the newly formed Planetary Defense Force cut it's teeth under the World Eater's brutal training regimen. The fortunate few of the Daemons that slipped past Luna's watchful eyes the night before planted their seeds into four hearts already touched by madness.

Khorne

It came to him again, the dreaded memory that haunted his every sleeping hour. That worthless puny pathetic excuse for a dragon holding the Bloodstone Scepter and claiming the title of Dragon Lord. Ordering him to humiliate himself as vengeance for putting the shrimp in his place. And then giving the Scepter to another dragon that was almost as puny and sappy as he was.

He tried to ignore it. He tried to move on and forget about it. But he always found himself wondering what he could've done differently that would've let him win.

This time however, the dream was different. He didn't see different ways he could've won. Instead, the dream was focused on those that defeated him. How they worked together, how one went for the scepter while the other distracted him. But most of all, how during the very first challenge, even though he forgot about it, he saw the so called Dragon Lord get knocked out of the sky and into the water below, only for that Pony Lover to save her life. She shouldn't be Dragon Lord, she should be dead.

Indeed, the worthless failure should be.

Garble's eyes snapped open. He wasn't in the dragon lands anymore, though the only difference was that his favorite lava pool was now a lake of blood... It was kinda cool.

But that wasn't what held the juvenile dragon's attention, he instead was staring at the strange creature that sat atop a mountain of ape-like skulls.

Garble hadn't seen anything like it. He almost mistook it for a dragon. But no, any dragon that big would already have it's wings, plus it's head was wrong, just barely.

"W-who...no, WHAT are you?" Garble asked the creature.

"I am...willing to help you." Claimed the creature.

"Uh...okay, first off: dragons don't need help. And second: help with what exactly?" Garble inquired.

The creature smiled. "First off: you're right. Second off: Help you take what is rightfully yours from that fake dragon."

Garble groaned. "As nice as that sounds, the fact is that Dragon Law clearly states that a Dragon Lord cannot be challenged until they've held the title for ten years. And even when that time runs out, I'm going to get the scepter on my own."

The creature laughed at this. "And how do you plan to do that... when you're outnumbered."

"What are talking about? There's only ever one Dragon Lord. All I have is get the scepter away from Ember, and that one is me." Garble claimed.

"And all she has to do to stop you is get her pony friends to interfere on her behalf. Even if other dragons wouldn't help her stop you from doing what you most certainly could, the ponies would never allow it, because they know what you'll do to them." The creature reasoned.

This gave Garble pause. Any other dragon would never ask for help defending what's theirs, but Ember wasn't any other dragon. She could ask for help, she's done it before. "Grrr, Well what am I supposed to do about it. Dragon Law doesn't say anything about asking for help."

"It shouldn't have to. It should go without saying that a Dragon Lord fights alone. Because real dragons don't have friends who fight for them and fake dragons shouldn't become Dragon Lords in the first place. That Scepter is yours by right, and the laws that you are raised to obey keep you from it, Dragon Law has failed the dragons, and now they listen to ponies." The creature explained.

Garble was taken aback. He was right, no Dragon Lord had asked for help before, nor had any dragon for that matter, that's why it wasn't written down. Not because it wasn't wrong, but because it was so wrong that no one had to say that it was wrong.

"Well, what's in it for you. Or do you honestly think that I'm going to believe that you just wanna help me?" Garble challenged.

The creature smirked. "I am no pony. In fact, I despise their kind more than you do. As for what I want, Equestria: destroyed. Do we have a deal?"

Garble mirrored the creature's smirk "What's the plan?"

"Plan? I don't deal in plans. I deal...in power." With this, the creature reached it's hand into the lake of blood and pulled out a double bladed ax forged from black steel and bearing demonic iconography.

"Those killed with this weapon have their power added to the ax's wielder. If those weaklings in Equestria have proven anything, it's that there's strength in numbers, make that strength your own." The creature says as it hands Garble the ax.

The minute he touches it, all of Garble's frustrations come to the forefront of his mind, amplified tenfold, and all he wants is to make those worthless pony loving weaklings pay for denying him his right...to kill the weak.

Tzeentch

Queen Chrysalis tossed and turned in her sleep, the mutiny of her hive replaying as she slept on the forest floor. Revenge. She must have revenge, but she needed a plan.

How fortunate, that's our specialty.

Chrysalis awoke not in the Everfree forest, but in a realm that shifted and changed at a pace far greater than the changeling hive...she found it soothing to her eyes.

The only reason she knew that she wasn't alone is because the creature that spoke to her shifted and changed in a different manner, as if on an opposite wavelength from the realm they both occupied. The only thing that didn't change about this creature was it's head, the head of a raven with ever changing feathers of different size and color.

"You seek revenge on those who chose to give up the path of power for the sake of peace. My associates wish to see this world burn, would you care to deliver the final blow?" The creature inquired as if it even had to ask.

And so Chrysalis listened to this raven's omen of death, how four different attacks would be launched in conjunction. The attackers would only work together in terms of timing, and when the pieces fell into place, Chrysalis would know exactly how to personally thrust the knife into Equestria's warm caring heart.

Slaanesh

Boredom, that's all he felt these days. His aunts always tried to teach him how they were making Equestria better with Friendship with barbarous dragons and uncultured yaks and those horrible changelings, but he just couldn't see it.

The world would be so much better if those disturbing creatures would simply vanish, or at the very least, use what little they're good for to serve Equestria. Heh, maybe one of those changelings could be made into a proper mare.

And why would you need an insect to do that?

Prince Blueblood awoke not in his room but in a throne room that, unlike Celestia's, actually met his expectations.

He made his way to the throne, the servants all stopping what they were doing to bow before him as he passed, all without faltering in their tasks. But he didn't notice this, it was expected of servants after all. No, he noticed her.

She was the most beautiful mare he had ever laid eyes on, even in spite of the goat-like horns flanking her normal horn, even in spite of one of her wings being bat-like, even in spite of one of her legs being covered in a dark purple exoskeleton, the rest of her...by Celestia, the rest of her, Blueblood had no words.

"Oh, why hello my dear prince." The alicorn said with the most beautiful voice Blueblood had ever heard as she walked towards him.

Blueblood extended a hoof, and the mare gladly kissed it with such passion that he could tell that she genuinely enjoyed it as much as he did.

"H-he-hi...wu-who are you?" The prince babbled, feeling very light headed.

"I am Secret Keeper my lord, your servant...and your property." Secret Keeper all but whispered, making Blueblood's heart almost seize.

"O-Oh...a-are you?" The prince said, delighted but fearful that his Aunt Luna could pop in at any time and speak of this to Celestia.

"Oh, I wouldn't worry about her. She's too busy with that alien and the little army that they gave him." Secret Keeper reassured him.

That managed to ruin Blueblood's good mood. His royal blood ensured a life of comfort, but he had little pull politically, and he didn't have any personal guards.

But suddenly, this alien ape thing that proudly confessed to being a killing machine brings it's war to Equestria. And instead of throwing it in Tartarus where it belongs, they give it an army. And use an ancient Equestrian artifact to give him a nice sword.

"OH! Oh I am so sorry my lord, I didn't mean to remind you of the failings of your aunts." The alicorn said with a smile on it's face, a smile that went unnoticed as her words fed Blueblood's ego and self-importance to a level unheard of from the prince.

"Oh, it's not your fault. It's theirs. But what can be done? They rule all of Equestria after all, and they refuse to listen to me." Blueblood ranted, his frustrations doubling with every word as he started to realize that their actions were even more absurd than he once thought.

"Oh, but they won't rule for long." The mare whispered into his ear as she started to stroke his chest with a hoof.

"Wu...what do you mean?" Blueblood asked, excited by the thought of someone smarter being in charge, and also ecstatic for the mare's touch. "The being who gave me to you as a gift intends to dethrone your foolish aunts...and place you on Equestria's throne to rule as you wish." The alicorn said to the arrogant unicorn.

"Oh really, well I can't wait for that. But how do you plan to pull that off?" Blueblood asked as he unconsciously pulled the mare closer to him so he could take in more of her alluring scent and the smoothness of her coat.

"There are others seeking to conquer Equestria, but they will all be stopped by your aunts pupil and her friends...as will my master, if you let them." The thought of Twilight Sparkle's friends made Blueblood bitter, especially that worthless sow that humiliated him at the Grand Galloping Galla.

"How do I stop them?" Blueblood asked, too focused on his own arrogance to even hear his own words at this point.

"Easy my lord, the key to their power is their unity. Break them apart, isolate even one of them, and the rest are useless." The alicorn whispered into his ear as she stopped stroking his chest and wrapped her front legs around his neck.

"Oh, I know just the one." Blueblood chuckled to himself as he mirrored the mare's actions. The two of them standing on their hind legs and the mouths to each other ears.

"Yes, but that is for another time my lord. For now, enjoy your dreams." With these last words, the mare pulled her lips from Blueblood's ear and merged them with his own lips as they fell onto a bed that materialized out of nowhere.

Nurgle

Of the four Daemons that escaped Luna's sight, the weakest was a lone Nurgling. The small beast-minded Daemon sought a sick despairing individual to give Nurgle's love, to make him forget fear and pain and accept his unchangeable fate.

But there was no such creature among the ponies, nor among their allies, for all who were sick and ill were cared for kindly and those who couldn't be saved were made ascomfortable as possible until the end.

The Nurgling thought it should return to the Grandfather, to tell him that this world was as kind as he and, dare he believe it, did not need his love. But that changed when he found them.

Deep within the bowls of the Everfree Forest, forgotten and abandoned by their loved ones, were hundreds of ponies... infected with Swamp Fever.

This dreaded disease was inflicted by a flower's pollen, and slowly turned the infected into the very trees that grew the flower, making them dangerous. But this did not register with the Nurgling, only the fact that the Equestrians left the infected all alone in these woods, left for dead when they were still very much alive...and oh so lonely.

The Nurgling could feel the despair of the infected, who live on as trees but cry out to be ponies once more, their cries unheard.

This angered the small Daemon who immediately burrowed into the tree possessing the strongest soul that it could sense.

The Daemon merged with the soul, sacrificing it's will in order to give the pony it's animal like awarness.

From the Nurgling's burrow in the tree emerged a unicorn. The Equestrian was in the final stage of Swamp Fever infection, with tree branches sprouting the deadly flower protruding from it's back, but it would never be a tree again, it was free.

The unicorn leaped and whinnied with joy at it's new found freedom, and yearned to return to civilization, but not yet. It would never share the cruelty of those that abandoned him and do so to the others, and so he channeled magic from it's horn to the other trees. Broadcasting their unheard pleas to Grandfather Nurgle.

Author's Note

And there's our first wave of bad guys. Garble's planning a mutiny. Chrysalis is planning to seize victory while everyone else is fighting. Prince Blueblood is planning to take the Mane 6 out of the picture. And a single Nurgling just started a zombie apocalypse. (what else is new)

I hope that I represented the methods of each Daemon when it comes to corruption, I kinda feel like I might have made the Bloodletter sound to Tzeentchian but I figured if there is any character that Khorne's followers would sympathize with it'd be Garble.

I mean, I get the whole team work thing and I know for a fact that it's a good thing that Garble didn't become Dragon Lord, but I still feel he got cheated out of something that he earned because 'he's the bad guy and Spike and Ember were the good guys'.

Also I am aware that today's episode featured Garble, but I had to miss it and plan to watch it tomorrow.
With that, and the fact Queen Chrysalis is still on her own at this point, we are officially in an AU.

Also, there is more to the Chaos invasion than what I revealed here, but that'll have to stay hidden...for now.

P.S. To those who are unaware, I have been posting YouTube videos that compare characters from MLP to factions in 40k. If anyone has a request, I would love to hear it.