Apocalypse by Brago12716(Fairy tailxHighschool DxD)

Summary: What happens when you drop the dragon of the apocalypse into the world of Highschool DxD, find out in this adventure that might just bring an end to everything in one way or another. set after Acnologia's defeat in the caverns of time in the manga of Fairy Tail and the start of the series of Highschool DxD. M for obvious reasons, not a harem, and no love interest of any kind.

Link: https://m.fanfiction.net/s/12872522/1/?__cf_chl_tk=ZbbI4QqJSTeYOXPW_RhR2WPQROrRn85Mj9qS4mjkotA-1652072085-0-gaNycGzNFGU

Word count:29k *prolly dropped*

Chapters:5

Chapter 1

Beginning of the Apocalypse

Acnologia, the very name itself strikes fear into the hearts of all those that even hear it, for those that have seen the sight of the giant dragon coated in black wings, it brings nightmares for the rest of their natural lives, and those lucky to hear his voice, their children can feel their shudder. He is without a doubt, the most powerful being on Earthland, and the only way he could ever die is after all dragons and dragon slayers were dead at his feet and the rest of humanity was annihilated, or so he thought. At the end of his long life, he was finally killed, not because of an all-powerful god, not because of dragons that banded together to kill him, he died because of seven dragon slayers that stood together and was able to fight his human form on equal ground while an entire nation stood against his dragon form. After a lot of struggling from both sides, all seven of those dragon slayers had finally did the impossible and killed Acnologia, the black dragon of the apocalypse, so imagine his surprise when the next time he opened his eyes, he found himself floating around in an endless void. There was nothing for eternity, not a single voice, no silhouette of anything, the only thing floating in the endless void of nothing was him, all he could see was darkness, all he could feel was nothing, he briefly thought that what he was going through was a punishment, but then he put that thought out.

It was only after closing his eyes again to at least get some sleep since he'd be here for eternity that he felt something else, he felt something on his back, it felt cold and hard, with crevasses carved into it, so when he opened his eyes and saw a tree, he was quite surprised. He would have thought it was night if it hadn't had been for the swirling of colors in the sky, but why would he be back to life after just being killed, he set up and let his mane of dark blue hair get off the stone ground, he was still in normal clothing, black cloak and baggy black pants. He could feel all of his power in tact, a good flex of all his ten fingers means he had all the feeling left in his body, wait, ten fingers, he did a double take at seeing both of his arms was in tact, yet he distinctly remembers having one tore off the moment he killed Igneel. As if to add to his confusion, he could practically smell the lack of nature in this world, he had always loved nature, which is one of the reasons he hated humanity so much, he felt them doing so much harm to nature and building so many towns and cities over it that it made him sick.

Acnologia set up and wondered where he was since he wasn't in his own world, so far, he could see trees, but they weren't very well off trees, with a few of them on the verge of death thanks to the high pollution in the air poisoning them, but past the trees is a sight that was interesting. It was of a woman with long black hair and black feathery wings, she wore nothing but a black leather bikini, but what was interesting was that she was standing in front of a boy with brown hair and looked to be quite plain looking, it wasn't until Acnologia took a sniff did he noticed something. Acnologia noticed that the boy had the smell of a dragon on him, and it was a strong sent as well, but it was mixed in with a human scent, and the woman didn't smell anything like a human at all, he didn't know what they were, but the scent of a dragon sealed the boy's fate instantly. "Well I have to admit, I did have some fun today, considering how naïve and childish you are, things could have been much worse, and thanks for the gift too, very sweet, but even so," just as the woman said that, she looked to be about to cast a sell or something, she didn't get the chance. In an instant, Acnologia was past the boy and made a hole in the boy's sternum with his single claw, the boy had only a semicircle on his left side for a body, his right arm was destroyed, and you couldn't even tell where the organs were, they all evaporated the same instant as the rest of his body. "Hey, that was my kill, I don't know who you are, but you do not take my kill away from me," the woman yelled before making a glowing short spear and threw it for Acnologia's back, when it struck, it exploded in little particles and didn't effect him at all, not even a scratch was on him.

Acnologia turned to look at who it was that gave him the little tickle, it was the woman that was about to kill the boy he just killed, probably mad that he took her prey, "if you're going to attack me, at least give me something good," he told her with a smirk, might as well have fun.

"Are you mocking me, you'll pay dearly for that you mountain man freak," the woman yelled out before making another spear and throwing it at him, and to her shock, he caught the thing with his right hand and a smirk on his face, he examined the spear for a moment before biting into it.

The woman was obviously expecting him to be in some sort of pain once he did that, but she didn't expect him to just keep chewing as if nothing was wrong, "hmm, it's a little sour to the taste, but not bad, in fact it's a little bit addictive, what type of magic is this," Acnologia asked.

In the woman's shock she almost didn't register his question, it wasn't until he took a step in her direction did she answer, "it's holy magic you freak, being a fallen angel means I can summon it at will, but what are you and why are you here," the woman asked with a warning scrappy look.

"You're scrappy, but you're also rude, you do realize it's rude to ask someone's name without giving yours first, right, so, let's try this again, my name is Acnologia the black dragon of the apocalypse, who are you," he asked with another step and another bite of her spear.

"My name is Raynare, I'm a fallen angel, and no offense to you, but you don't exactly look like a dragon, I've seen dragons and you look like any other man, other then that wild mane you call hair, that's very dark blue," Raynare stated as he took another step and another bite.

"Trust me, I'm a dragon, and you said something about being a fallen angel, what were you about to do to that dragon that I just killed," Acnologia asked the fallen one, he didn't really know what a fallen angel was, weren't they some type of devils or something, he heard something about that.

"That boy you just killed was my prey and he wasn't a dragon, and I don't know how you knew, but he had something called a sacred gear, since you're a dragon you know what that means right," Raynare asked and he just shook his head in the negative, no point lying about what you don't know. "You have got to be kidding me, fine, sacred gears are objects implanted into humans, some have souls of their own, those souls can be many things, one of which is a dragon, the boy you just killed must have had a sacred gear with a dragon's soul in it, how do you not know this since you claim to be a dragon."

"I am a dragon you fallen bitch, but since you can't really tell, I'm a dragon from a different world, a different dimension if you will, called Earthland, what is the world I'm in now though, tell me and I may let you live," Acnologia stated while raising his hand with a light blue glow around it.

"Oh please, you may be able to eat magic, but that just means all I have to do is feed you magic until you no longer can eat it, I would have thought that a mighty dragon such as yourself would know such a thing," Raynare replied back with a glare, she just didn't expect a dark laugh in response.

"You do know that it would take the force of several etherion blasts to even come close to my halfway full point, and you don't come anywhere close to that level of power," Acnologia stated before he noticed her confused look at the word etherion, he wasn't expecting that. "You do know what etherion is, right," she shook her head no, "ethernano," another shake, "how does your people explain magic then, I can sense the ethernano in the air, I was an ethernano dragon slayer when I started out, which is why I'm able to eat magic, all types of magic." She still looked at him in confusion, "ethernano is the small particles of magic, everything is made up of some kind of atom, magic is no different, the atom that magic is made up of is called ethernano, and since I'm the ethernano dragon slayer, I can eat all types of magic, including this holy magic."

"I think I get it, since everything is ethernano and you're the ethernano dragon slayer, you not only get to eat all types of magic, but you also get to use all types of magic as well, meaning you are the biggest threat to everything," Raynare guessed as best as she could.

"Now you're using your brain, there's a reason I'm known as the black dragon of the apocalypse, now, why do I need to keep you alive when I have all of my own power at my disposal," he asked with a threatening step towards her, now she could feel the power radiating from him.

Just before she could answer though, a wave of destruction magic that was black with a red outline struck at him from the back, it had the same effect as when Raynare through her spear of light, it was useless and evaporated as soon as it struck, Acnologia turned and saw a red haired girl. She was standing there in a white shirt, black corset with white accents, magenta colored skirt, and a black shoulder cape on, the expression she wore was not a happy one, it looked as though she would attack them again at any moment, and the expression grew when she saw her attack failed. "Are you the ones that killed that boy," she asked with a glare, they didn't say anything at first, just stared at her like she was crazy for a moment, she just attacked them and demanded answers, sounded like a spoiled brat that needed to be put down a few pegs.

Raynare on the other hand recognized her, or maybe her hair, "damn, that's a Gremory, you can stay if you want, but I'm out of here," she said before spreading her wings and was about to fly away, but then she heard a sucking sound and noticed how weak she felt, the bastard drained her magic.

"I never said you could leave," Acnologia said with a small glare directed towards Raynare before going back to looking at Gremory, "it's bad manners to attack someone without introducing yourself and asking for a fight, I thought you royals knew that, but then again, different world, different rules."

"My name is Rias Gremory, heiress to the Gremory clan of devils in the underworld and president of the Occult Research Club at Kuoh academy, now answer my question, are you the ones that killed that boy," Rias demanded as she readied another spell of destruction.

"Oh, him," Acnologia glanced at the body of the boy he just killed, "he reeked of dragon, so I killed him, she was complaining that I took her prey," he pointed his thumb towards the weakened Raynare, "what did you want with him, for prey or something like that."

"I don't go around killing people on a whim, I was going to revive him as a devil and bring him into my peerage, one of the strongest sacred gear users I've ever found and you just killed him because he smelled of being a dragon, you scum needs to die," Rias yelled before sending another wave of destruction at him.

Now, she expected one of two things to happen, him dodge the spell, probably to the right since he's facing that way, or put up some type of defensive spell to block the incoming destruction, she assumed the reason her spell didn't work before was because of this reason. She did not, however, expect the action that he took, instead of doing something like dodge or defend, he actually took the full brunt of the attack, just stood there and didn't move, Rias thought he was crazy, but didn't give it a second thought until she heard a sucking sound. That sucking sound soon sucked in all of her destruction magic like it was nothing, he even chewed some before gulping the rest of it down, after he was done he spoke as if judging her magic, "not bad, a little spicy, but not bad, of course, I prefer sweet tasting magic, but it's still good."

Rias stood there, gob smacked that someone actually ate her power of destruction, like it was nothing, nobody could do that, there was nothing in all of recorded history that could do that, "h-how d-did y-you d-do t-that," she shakily asked, while Raynare gave a dark chuckle.

"Apparently, you missed the explanation as to how he can eat someone's magic, do you want to or do you want me to," she asked Acnologia who gave a gesture as if to say go ahead, "the world Acnologia comes from has already figured out the particle all magic is made of. They call this particle ethernano, the reason he's able to eat that particle, is because he's a ethernano dragon slayer, I don't know how, but he claims to be a dragon himself, so not only can he eat all forms of magic, which renders him immune to all types, he can use all magic as well."

Rias was in shock, not only was this guy from another world, but he's also able to eat, use, and is immune to all types of magic, impossible, then again, maybe she could use him to her advantage, she still needs for someone to help her get out of a marriage contract, "what do you want," she asked.

Acnologia showed no emotion before he moved, the speed he used was just so incredible that it shocked her, because one second, she was across from them at the edge of the park, the next she was beside of the fallen angel with both of them being slammed into the fountain edge, breaking it. "What I want is destruction, the destruction of all human life, dragon life, and if I determine your kinds a possible threat to me, the destruction of all devil and fallen angel kind," he spoke with a sick grin before he realized something, "aren't fallen angels and devils the same thing?"

The both froze in thinking about struggling, and their kind's impending doom, to stop and look at him with a blank stare, then at once they shouted, "WE ARE NOT THE SAME THING," before actually struggling to get free of the dragon king that stood before them, it seems he hit a nerve.

After a minute of struggling in their blind rage, Acnologia had enough and decided to end their squirming by grabbing them by both of their necks and lifting them up, "now listen to me you arrogant and weak creatures, you had better give me reason to keep you both alive, or else."

Both paused in their futile struggling to stare at him, trying to think of anything they could offer him so they wouldn't be killed, or a way to serve up the other one to get away, Rias was the first one to say anything, "what about information, surely you need information about this world."

Raynare had a thought as well, if Rias was giving information, and since she's the sister of the devil king, she knew stuff that Raynare didn't, but she could offer something else, "I can give you a source of magic to eat when you need it, a living dinner plate when ready," she gave a nervous smile.

"Why, I'm so powerful that I could just roam around and take on anyone I so desire, eventually I will get so powerful that I'll be feared and only the strongest could ever hope to take me on, I don't need information or a magic source for that," Acnologia questioned, and that sounded better to him.

They hated to admit it, but he had a point there, what else were they going to say to survive this, Rias saw one possibility, but it was a wild card, but it was also the only choice she had, "what about companionship," the hold on her throat instinctively tightened, "please hear me out. Your goal is destruction, complete and utter destruction, that means killing everything, and once you've killed everything, you'll be alone, a king without a kingdom, complete solitude, you'll drive yourself crazy trying to find something to do by yourself, what will you do then?"

Raynare caught on to what the Gremory was doing instantly, and it pained her to do this sappy stuff, but at least she'll live, so she joined in too, "being alone is not a good thing, it may seem like it at first, but eventually you'll be driven crazy by knowing you're all alone, can you stand that?"

Acnologia thought about what they were saying, it was just to save their own skin, but it was also a good point, being alone forever was not a good thing, and the both of them did show potential, "so, you two are willing to become my…companions, knowing that most you know will die?" They paused briefly, Rias thought that if given the chance, he could turn into a good ally for her, turn him to the good side before the destruction, and Raynare thought that he could also be a good ally, the destruction wouldn't hurt her much, the world never did anything for her, but she'll live. The both of them nodded in the positive before they were dropped to their knees when he released them both, he knew that they were planning, their types of people always were easy to predict, but the entertainment value was too good, "which one of you has the better base?"

"More than likely the Gremory, me and my group of fallen and some stray exorcists are working out of an abandoned church just within the city limits," Raynare commented, as she rubbed her neck where he was choking them, the strength was unreal.

"I do have something better than that, my group and I work out of the old school building of Kuoh academy, we go to school there and pose as a club called the Occult Research Club, we have plenty of room to house you, and her if needed," Rias informed, with a glare towards Raynare.

"Now don't be like that, you two will have to play nice to one another, seeing as how you both are going to be by my side as I destroy the world, who knows, I might even let you two have some destruction yourselves, just for the fun of it," Acnologia said as he stared down at them with a grin.

"I'm not interested in partaking of this destruction of yours, you can have all of it, but for now, we should get to the club room, introduce you two to the rest of my peerage," Rias suggested as she stood up, she obviously didn't like that fact, but she's going to have to put up with it.

She started to walk away and motioned for the other two to follow, she decided to walk there to show them the way so, if needed, Acnologia cold find it on his own, Raynare came up to walk beside her and whispered, "we just let the apocalypse start, do you know that?"

Rias didn't trust the fallen angel by any means, but they were about to be in league with the being that might bring about the destruction of everything together, "I know, we might be able to change him, but then again, we just might have brought the beginning of the apocalypse," she stated.