Alright this chapter isn't bout Y/n and is instead about the past. Might be a oneshot

The purple skies of the underworld were choked by black storm clouds that boomed with thunder.

A black haired man with a red streak going through his hair could be seen standing in a macabre setting filled with red jagged rocks and purple floral.

The man had a centipede like tattoo going down from under his eye down his right cheek. He wore a white cloth blindfold over his eyes that covered his sight. But despite that he was able to see via the Qi flow of the objects around him.

He wore black spaulders with gold trimmings over his shoulders that reached down his arms with two finger guards.

This is the first emperor of china Qin shi huang the first man to unite all of china together. And the first human to earn respect from the seventy two pure blood devil families.

Qin: To be honest, I knew this day would come quicker then I imagine.

The human emperor flashed a grin towards his opponent sirzechs Lucifer one of the four rulers of the underworld

Sirzechs was a devil with vibrant crimson hair, his green eyes were filled with exhaustion and happiness. His attire was a mostly gray colored armor with gold trimmings. Underneath he has a green and white coat underneath with a black sash.

Sirzechs: If I said I wasn't looking forward to this i'd be lying. . Let's make it something the winner will never forget.

A red and black aura of destructive magic covered sirzech's frame flaring brightly making the land quake.

Qin: Chi yo: Armor form.

Qin got in a fighting stance with his left hand extended out palm facing ahead while his right hand was pulled back palm facing forward.

A gust of wind swept through the clearing as Sirzechs blinked Infront of Qin with a magic infused punch that rocketed towards the humans head.

Qin threw a high kick making contact with Sirzechs fist stopping it as well as creating a larger crater that spread out into multiple fissures whilst a shockwave spread out crumbling down the mountains nearby.

Sirzechs: You got stronger, usually you would have stumbled back at the very least whenever we clashed.

Qin: A Emperor always needs to be strong enough to protect his people.

Sirzechs: That's exactly what I expected you say.

Blood splattered against the ground when sirzechs ripped his fist back and focused more magic into it creating a sword which cut through Qin's side.

A huff left his mouth as he landed on his feet with blood dripping down his side collecting onto his feet.

Qin: Heh. . . alright then.

The blindfolded Emperor vanished from sirzechs sight and his head turned to look behind him where he found win with his leg pulled back with the visage of a tiger behind him ready to pounce flashing.

Sirzechs: What?!

Qin: Chi yo: Halberd!

Qin lashes his leg out connecting with Sirzechs jaw making the devil king spit blood out and a tooth along with being blasted away through multiple magic circles he created behind him to slow himself down.

A grunt left Sirzechs mouth as he slammed into creating a plume of dirt and dust which scattered with the wind.

The terrain shook as sirzechs pushed himself to his feet with his arms hanging by his sides.

Sirzechs: T-That really hurt. . .hah. . . . .hah. . . You're one of the few people that can actually hurt me ya know? Very impressive. . .for a human.

Qin: You underestimate humanity. . .we have no limits. .

Sirzechs: So I've seen through you.

The replacement of Lucifer flew upwards into the sky and lifted his hand upwards as a bright red light filled the sky.

Qin: Hoh? What are you doing up there zechs?

Sirzechs: Cylinders of Extinction!

Raining down past sirzechs were fiery cylinders of destructive power that targeted Qin.

The first Chinese emperor started to strike certain angles of these cylinders making them break apart into harmless particles but more and more came staring to overwhelm the ruler who started to struggle.

Sirzechs clasped his hands together and pulled apart creating a spear which he twirled in his hands before he threw it towards qin creating an eruption of magic.

The smoke cleared and Qin could be seen knelt down panting before he stood up with a grin, slight burns spread across his left cheek and down his neck.

Qin: N-Not a bad attack from you zechs. . .I've never seen that one before.

Qin got back into the chi yo stance as sirzechs dropped from the sky landing on his feet.

Sirzechs: I have a few tricks I've never shown you. . .RUINED QUAKE!

A stomp from sirzechs created spiderweb fissures in the ground.

Magic suddenly shot out those cracks knocking qin up into the air as sirzechs jumped at him with his fist pulled back.

Qin: Heavenly hand of redirection!

Sirzech's fist connected with a red colored ethereal shield Qin created before a double palm thrust was sent into his stomach with the force of his own attack being redirected right back at him.

Sirzechs: Augh!

The red haired king dug his feet into the ground slowing himself to a stop as he rose his hand into the air creating a flash of light via letting his magic explode out of him creating a brilliant light that blinded the human emperor.

Sirzechs took this opportunity to extend his arm out creating a sphere of destructive power around qin swallowing the human whole.

The magic inside started to disintegrate whatever was inside including Qin who took a breath of air and blew an air bullet out that upset the Qi flow of the attack weakening it as it was shattered with a punch from the human.

The damage of the attack was already done, Qin's body was mostly covered in burns and his charred black blindfold loosened and fell allowing sirzechs to see the glowing shimmering star shaped pupils in his rivals eyes.

Qin raised his hand up to his face touching his forehead two of his fingers wiping away the blood on it with a smirk.

Qin: Ahh. . .that hurt.

Sirzechs: You're at a disadvantage with your mirror touch synesthesia. .

Sirzechs tilted his head to the side as Qin's eyes looked up at him.

Qin: I'll be fine, you should know that already after all our fights by now. .

Sirzechs swung his arm sending forth a wave of destructive magic that Qin leapt over and twisted himself in the air to dodge a point blank blast.

Sirzechs felt his armor shatter from the force behind the punch he received that blasted him away but his wrist was grabbed pulling him closer before he took another punch to the cheek that carried him into the ground.

A output of destructive magic exploded out of Sirzechs throwing Qin away who crossed his arms Infront of his face as he skidded backwards.

Sirzechs: You're. . . Putting more force behind those punches now. . . Then I'll meet them with equal force!

Qin's fist clashed with Sirzechs creating a shockwave before the two of them started to throw a barrage of strikes that each clashed creating a multitude of shockwaves

Sirzechs stomped on the ground channeling magic through it as qin jumped back barley avoiding a pillar of energy that would have consumed him whole that illuminated the stormy skies of the underworld.

Qin landed on his feet throwing a round house kick that cut open sirzechs chest but his leg was grabbed and he was slammed into the ground repeatedly creating fissures that spread.

Blood exploded out the human's mouth falling onto his face as sirzechs slammed him into the ground one final time.

Sirzechs aimed his palm at Qin who dug his hand into the ground and threw himself out the way of the blast that exploded the ground knocking him up into the air as sirzechs delivered a haymaker smacking him down.

Qin flipped in the air landing on his feet as he and sirzechs stared eachother down.

Timeskip. . .

The ground quaked tremendously as two blurs slammed into each other one black and one red.

Shockwaves and the ground quaked everytime they came into contact.

The red one was overpowered and hit the ground before the blur faded revealing sirzechs as the black one stopped showing Qin.

Sirzechs tried to strike Qin with a heavy chop that was blocked but it shattered the left arm of the humans spaulders sending the human skidding back.

Qin: You alright Alvitr?

Manifesting behind the emperor was a young looking girl, she had orange hair held in a drill hair style.

She was also wearing the same outfit he wore but ripped and torn her left arm was gone and was leaking blood and on her forehead was a large slash that oozed blood which streamed down her face.

Qin: I'm sorry it's my fault you got hurt. .

She floated behind him clutching at her shoulder that seemed to have a large chunk taken out of it.

Alvitr: Compared to how bad you've got it this is nothing. . .but what about you? Are you okay?

Qin glanced at her with a confident smirk on his face.

Qin: Mou mantai. .compared to the pain of others. . .my own pain is scarcely anything to bear

Alvitr: Sheesh, despite knowing you all these years you still surprise me. .
I can't believe you.

Waiting for them to finish their conversation was sirzechs who was also using this as an excuse to catch his breath just like Qin.

Qin: You can leave I don't want you to get caught in this crossfire more then you already have.

Alvitir: You idiot I told you when we used volundr all those centuries ago that our souls and fates were interwoven together, I'm staying with you til the very end. . Besides don't you dare give up we can still win!

Qin: Heh, I expected no less from you my boyish young Valkyrie. . You were loyal above all else.

Alvitir: Sh-Shut up. . .

Sirzechs: Hehe. .I'm going to miss this banter between you two. .

Alvitr: Don't count us out just yet Lucifer!

Sirzechs: Oh?

Qin: Before you do this. . .thank you vitr.

Alvitr: Let me give you all the power I got!

Her body broke apart into light that traveled into Qin's unbroken right arm forging itself into a sword with intricate details carved on the blade.

Qin/Alvitr : Almighty spaulders recast! Shi huang goujian sword!

Sirzechs: . . .Amazing. . .bravo! Bravo!

The devil king clapped his hands together applauding the two intertwined souls on their new weapon.

The power of destruction manifested into sirzechs hands constructing itself as a sword of magic.

Qin and sirzechs stared at each other before they dashed at each other with Sirzechs jumping into the air.

The two swords drew close as a ball of energy formed within the space between the swords keeping them apart as the clash uprooted chunks of the ground throwing them for miles as debris.

The two rivals made eye contact in silence as they edged their swords closer together breaking through the sphere of energy keeping them apart.

The sphere exploded and the two swords connected creating an earthquake that shook everything near and far.

Qin grit his teeth as he and sirzechs went flying away from eachother and dug his feet into the ground while sirzechs used his wings to stop himself mid air.

Blood dripped down the humans chin and he looked at sirzechs who landed on his feet almost falling to his knees.

Qin: The battle has gone on long enough. . .it's time to stop stalling sirzechs.

Sirzechs: I-I couldn't agree more. One final strike to end it all?

Qin: Hao, one final strike.

Qin pulled his sword back posed to strike as sirzechs did the same. In a massive burst of speed they rushed eachother swinging their swords.

When sirzechs's drew near Qin shot out a puff of air making it flicker allowing the human to impale him through the stomach.

Sirzechs: Augh?! Hehe. .

Qin spat out blood as Sirzechs impaled him with his sword. The two of them could only look into there others eyes. One filled with regret and the other happiness.

Qin: I'm. . Glad I could die a human. . At the very least. . Here. . .this is yours now. . .

Qin looked behind him as Alvitr manifested and flew off a little grabbing the torn up and burnt remains of his blindfold.

She came back and handed it to Qin who took it before wrapping it around sirzechs eyes but thanks to its tears and burns the devil king could see through it.

Sirzechs:  . . Thank you Qin.

A pained laugh was the response he got in return as the Chinese emperor looked up at the sky.

Qin: Promise me that. . .my dynasty will never die. . .even if there's just one person left of my blood. . I will be satisfied.

Sirzechs: I-I promise. .

Qin smiled brightly one last time and the light faded out his eyes as Alvitr hugged him from behind before looking at sirzechs.

Alvitr: You made him really happy. . .he  always spoke about how if he was ever defeated that he wanted it to be by you. . . .thank you Sirzechs lucif- Gremory for everything. . .

Her body and Qin's started to break apart as tears rolled down sirzechs cheeks who shot a hand forth as if to grab them.

Sirzechs: W-Wait! Don't go!

Blood spilled down his chin and he fell on his knees clutching his stab wound as his vision started to darken.

He fell onto his side falling unconscious with the last thing he saw being a green magic circle manifesting.

To be continued. . .
So yeah that's the first chapter. . Hope ya enjoyed. .