This may or may not foreshadow I book I may or may not drop sometime soon. No idea on what series but it is an idea for now ;)

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Y/n: "*yawn*"

I yawn as I sit infront of some of the most powerful people in hell. The round table was set up as Sirzechs, Azazel and Serafall. Behind them was Rias and her peerage, and Sona and her peerage. I was on the opposite end with my team behind me, minus Gilgamesh and Tiamat who were on each of my side. For whatever reason, Eucliwood was just sitting on my lap.

Sirzechs: "So what do you say"

Serafall: "Care to be Mr. Leviathan?~"

Y/n: "This sounds intriguing, getting support from all of you and all, but I don't wish to be turned into a devil or get dragged into your little petty wars"

Sirzechs: "We will not drag you into our battles I can assure you that much. I prefer doing that by sending Rias seeing as how much she has grown"

Y/n: "I can commend her on how much she has matured. She used to be a brat but seeing as how much she changed from the last time I saw her, I can atleast do that much"

Rias: "I appreciate the compliments King of Kuoh"

Y/n: "So tell me Sirzechs, what will you do when an opponent much stronger than her arrives? Will big brother come to the rescue or will you send Serafall?... None of those options I presume? No, you will be coming to me for help is that not right?"

Sirzechs: "... Looks like you hit it on the bullseye"

Y/n: "*sighs* Why did I expect you to say that. Look, I appreciate the offer but I'm not looking to-"

Gil: "Y/n"

I turn to my right where Gilgamesh was sitting on his own throne.

Y/n: "I also don't wish to be wedded to anybody just because-"

Serafall: "We will only be wedded in name!! You don't have to come to hell with me or whatever. You can be free to stay in Kuoh as long as you want"

Eucliwood was writing something before showing it to me.

Eu: "This isn't that bad of an idea. We do need help beating Kama"

Y/n: "You are right on that front.. I'll be straight up with you all. I'll accept it under one condition"

Sirzechs: "And what might that be?"

Y/n: ".. I need help beating an enemy of my own"

Sirzechs: "You need help? You are pretty strong yourself. Not to mention there is another, older version of yourself right next to you"

Y/n: "He's my grand father"

Gil: "I thought I told you to just call me your father"

He says facepalming.

Y/n: "I have too many mothers already. Im not trying to add X to that"

I say while turning around to see X wearing a large golden ring on her promise finger.

Y/n: "You are my grand father"

Gil: "Whatever. I was actually looking forward to being a father for once. You are the perfect person to being my son"

Y/n: "We'll talk about this later"

Azazel: "Back to what you were saying before, who are you referring to when you speak of this enemy?"

Y/n: "Her name is Beast III/L or as I call her, Kama. She is ruthless and powerful. So powerful, she destroyed worlds in a matter of hours just simply toying with them. I'm sure that if she was serious, it could of been seconds"

Issei: "The fuck?! So she can blow up planets?!"

Y/n: "Yes. That strong"

Sirzechs: "Someone that powerful huh?"

He says while getting a little nervous. Azazel looked just as nervous but raised his hand.

Azazel: "Explain what these Beasts are. By your naming of Kama, there seems to be more"

Y/n: "Quiet frankly, I'm just as lost as you. Gilgamesh could tell you better since he took one down with some powerful help"

They look over to the golden king who sits besides me.

Gilgamesh: "They are powerful beings. As far as I'm aware, there are 7 of them. Whether there are 6 other ones out there we have no clue until the make landfall"

Serafall: "How did they come to be?"

Gil: "They are spawns of humanity's evil. the Seven Calamitirs, positioned to enact the annihilation of Humanity that threatens the continuity of the history of Humanity"

Sirzechs: "Kama, she is III/L correct"

Y/n: "You're correct Sirzechs. Where there's a Lapse, there will be Rupture"

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Somewhere in space

??: "It seems as another planet has fallen. Hm? It seems someone is talking about me"

??: "Ara ara~ It seems like it is still too far away for me to catch up. Well, I'll just take my time for the time being then"

She giggles to herself as she sees a shining star cross through the sky.

??: "My my~ If it isn't the Supreme Leader of Evil. I wonder if she's heading there as well. Better not steal my love, or I'll have to crush her"

She says with an evil smile.

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Rias: "Why did you need Akeno?"

Y/n: "I got a plan in case my first idea doesn't work"

Azazel: "And what's this first plan you got? Does it have a good shot at giving us the winning hand?"

Y/n: "It is. I'll be sending Tiamat after her. A clash between Beasts"

Sirzechs: "That's Tiamat?!"

Tiamat: "Hello"

She says with a smile and a wave.

Y/n: "She's not the one you know. She is from another world. My world to be exact"

They stare at me curiously.

Y/n: "I'm not exactly from here as you all may or may not have noticed. The fact that I have multiple holy and demonic weapons. The fact that I have both Mordred and King Arthur as my subordinates. I'm from somewhere entirely different where the Age of Gods ended"

Sirzechs: "Fascinating, another reality"

Y/n: "You may be asking yourselves alot of questions and I'll answer them eventually but now, we have other matters to attend to. Rias, I need Akeno incase my plan fails and Tiamat can't beat her. I'll be using her and Ahri to teleport her away from here"

Serafall: "Won't she just fly here anyways?"

Y/n: "No. I'll be sent there with her. I have a secret trump card incase it comes down to that"

Sirzechs: "And what might that be?"

Y/n: "*chuckles* Well it wouldn't be a secret if I told you now would it?"

I say with a smile as Gilgamesh approves.

Gil: "Let's just say, it will get destructive. More than two Beasts going head to head"

Eucliwood's head rises and looks to a corner as someone appears. I sigh as I get irritated by him.

Y/n: "I thought I told you to stay back and watch"

Y/n Alt: "I don't think I ever made you my master now did I?"

I pick Eu up and rise from my throne before placing her down and head over to him.

Y/n: "If you want to battle that bad, I'll give it to you"

I stare him in the eyes.

Asia: "There's two of him?!"

Y/n Alt: "You wouldn't stand a chance kid"

Y/n: "I'd like to see then"

Gil: "Children, compose yourselves. We are kings. Not toddlers"

I take my gaze off him and return to my seat.

Y/n: "Fine. I'll lend you my help in exchange for yours. In name, Serafall and I will be married"

Serafall: "I feel like I'm a pain for you to marry me"

She says while her eye twitches.

Y/n: "Kinda. Anyways, don't just call me everytime for some low level demon you all can handle alone. I got bigger problems"

I pick up Eu and get up from my throne as it heads back to Babylon.

Y/n: "Well, I believe this ends our meeting. I'll be getting in contact with Serafall through Sona to set up a date for the wedding.. as far as Kama, just leave it up to me for now. Rias, I'll be borrowing your queen should everything lead to worse case scenario"

Rias: "That's fine. Issei, you had something you wanted to speak about with Y/n?"

Y/n: "Me? Well then, speak up oh Dragon Emperor"

Issei: "I wish to join your fight"

Y/n: "Oh really? And why would I bring you along?"

Sirzechs: "It could serve as a peace treaty of sorts, being that you and Rias had some.. bickering before. It could also serve to help him gain more experience in battle being alongside someone as powerful as you"

Y/n: "You sure know how to please someone?"

Sirzechs: "Just trying to help him out"

Y/n: "*sighs* Do you have any sort of transformations or power ups since the last time I saw you? Don't tell me that little arm gauntlet is all you own?"

Issei: "Of course not!! I have my Balance Breaker form. I also have Ascalon"

Y/n: "Is that it?"

Rias: "He can also provide high boosts of energy to you"

Y/n: "Ahri can provide more than what he can produce in an hour, in a second. Not to mention she can do it in a party wide scale"

Issei: "Please"

I turn to him who was bowing to me.

Issei: "I wish to keep my friends safe. I know it's alot to ask to bring me along since I'm nowhere near as powerful as either of you but I beg you. Please Bring me along!!"

He doesn't once lift his head up as I could sense Gilgamesh facepalming.

Gil: "Hurry up, I know what the hell you are going to decide"

Y/n: "I'll do it under one condition"

Issei lifts his head up immediately.

Issei: "Anything!!"

Y/n: "You have a sword now, use it. Mordred!!"

Mordred: "Yes master?!"

Y/n: "You'll be in charge of his training. I don't want him to have a single day off until he is ready to wield it. Got it?!"

Mordred: "Yes master!!"

Y/n: "X"

X: "Yes?"

Y/n: "Train him on his movements. The kid's fast but I need him moving faster. His instincts seem off compared to what I need them at. Make sure he is swift in that Balance Breaker form of his"

X: "Yes"

Ahri: "I'm guessing you want me to help him out with his magic training?"

Y/n: "If there's enough time for it, do it"

Ahri: "Okay"

She says with a smile.

Y/n: "I need you to take this training seriously. No goofing off got it?!"

Issei: "Yes sir!!"

I get right up to his face and stare him down.

Y/n: "I mean it. I'm entrusting 3 of my most powerful servants to train you, learn well and don't waste their time. Or else, I'll kick you out"

Issei: "Y-Yes"

I back away from him and look at Alter.

Y/n: "You. I need a word with you alone when we head back"

He nods as I signal everyone to head towards Ahri.

Y/n: "I'll be coming for him in 3 days Rias"

Rias: "I'll have him ready. How long do you plan to keep him for?"

Y/n: "A week is all they need. But if he slacks off, I'll keep him longer as a punishment"

I could hear him gulp as I smile sadistically.

Y/n: "Get ready for hell kid"

With that, we are sent back home by Ahri. I step out and Alter follows me. The rest head in but Gilgamesh looks at me.

Y/n: "You want to come too? Be my guest"

He trails behind us as I turn around to him and Gilgamesh.

Y/n Alt: "Why are you bringing that kid along with us? He's just going to slow us down and you know that!!"

Y/n: "I'll explain everything. Gilgamesh, remind me to call Ophis when we head back"

Gil: "You have something planned, I can sense it. What is it?"

Y/n: "Did you ever had a brawl or sparring match with Issei in the future?"

Y/n Alt: "Of course I did. Why are you asking?"

Y/n: "I had a dream last night. He's got some unreal potential"

Y/n Alt: "What exactly did you see?"

Y/n: "How exactly do I access the Mythological code"

Gil: "You're still interested in that?"

Y/n Alt: "Just tell me what you saw?!"

Y/n: "That armor he had.. it was something powerful. Whatever this Balance Breaker nonsense he's talking about isn't that armor. That was something else because it was kicking our ass for a bit before you got serious"

Alter's eyes widened as he realized what battle I was talking about and chuckled.

Y/n Alt: "*chuckle* Oh, you mean that battle~ I'll let you in on it since you don't know what we are talking about Gramps"

Gil: "Huh?"

~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Years in the future/Dream

Y/n is slammed into the ground as his body is badly beaten up.

Issei: "Can you keep up? Or am I just too powerful for you? Your reign of terror ends now Y/n"

Y/n rises up from the rubble with a smile.

Y/n: "Don't get cocky kid"

I cough up blood as he floats down.

Issei: "You can't beat me, I've surpassed you now. This power, I've gotten ahold of it thanks to Ophis. I'll kick your ass now Y/n!!"

Y/n: "I thought I told you kid"

I rise up to my feet as I pull a golden cup with a black liquid inside.

Y/n: "Not to get cocky"

I drink it as I become one with the Black Grail. My wounds heal up instantaneously as I feel my armor turn black and my pale skin turns dark as I active my alteres Mythological mystic code

Y/n: "My mana pool is now infinite. My power has grossly increased. It seems like I finally found a worthy opponent, so how about it"

I reach out and pull Ea.

Y/n: "You wanted me to get serious? Well then, I shall comply"

I can sense my powers further increase as I take out a little gift X gave to me before she was taken from me.

Y/n Alt: "A little Black Bean Paste should do the trick"

I take it down as I feel the power of the universe enter me.

Y/n Alt: "What I'm about to do isn't just beat you.. I'm going to annihilate you. Oh, and I'll have fun doing it. You have my respect for being the only one out of everyone I've killed to have stood a chance, you should of killed me honestly but now"

I point Ea directly at him.

Y/n Alt: "I hope they remember you. Because there won't be anything left once I'm done with you"

Issei: "I won't let you!!"

Y/n: "I'm not hesitating this time. The vortex that turns the stars, this heavenly hell signifies the end of the eve of genesis"

Issei charges me directly as I smile at him.

Y/n Alt: "Subside with Death!! ENUMA"

He disappears and appears behind me.

Y/n Alt: "Just as planned"

Black chains surround and hold him down.

Y/n Alt: "Void Chains"

I place Ea directly in his face.

Issei: "NO. THIS ISN'T SUPPOSED TO END END LIKE THIS-"

Y/n Alt: "ELISH!!!"

Issei: "NOO-!!"

And with one final blow, all who could challenge me have fallen.

Y/n Alt: "So who's next? *chuckles*.. I guess Gaia has different plans for me now.. huh? This world isn't what I wanted but it's all I have left"

??: "Please.."

Y/n Alt: "That voice?"

I drop Ea as I turn everywhere

Y/n Alt: "Eucliwood?!"

Tears run down my eyes.

Y/n Alt: "EUCLIWOOD!!!"

Eu: "PLEASE SAVE Y/N!!"

Y/n Alt: "I... Accept"

??: "Servant. Archer. Y/n Gilgamesh L/n Alter has accepted"