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High School DxD AU: The Crimson Prince Of Destruction

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Synopsis
A soul drifts in the void after death—until a mysterious ROB offers reincarnation into the world of High School DxD. The twist? His new life and origin are completely random. When he awakens, he discovers he’s been reborn into an alternate DxD timeline… as the son of Sirzechs Lucifer and Grayfia Lucifuge. Now armed with unimaginable potential and a destiny far beyond canon, Lucien Gremory will carve his own legend. Watch as he shatters fate itself—facing gods, devils, and monsters—while forging unbreakable bonds, chasing power, and maybe even finding love along the way. This is the story of Lucien Gremory, the Crimson-Eyed Devil who rewrote the world. Disclaimer High School DxD and all related characters, settings, and concepts belong to Ichiei Ishibumi and their respective copyright holders. I do not own or claim any rights to the High School DxD franchise or its characters. I only own the original character — Lucien Gremory.
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Chapter 1 - Chapter 1

3rd POV

"Thinking"

[Sacred gear talking]

Underworld, Lilith capitol city

'Where am I. Its so dark and sticky here. I also feel a strange warmth. I can't really see anything or barley move my body. I'm tired Ill take a small nap than try to escape later.' He thought and slowly fell asleep. He slept of nine months before finally reaching the day of his birth.

 In the Underworld, the city of Lilith. The current Capital of the Devil King territory ruled by Sirzechs Lucifer. In one of the most advanced hospitals, named Serafall Memorial Hospital.

 A silver haired woman is giving birth. Many doctors and the matriarch of the Gremory Clan, attended the delivery. The woman is the wife of Sirzechs Lucifer and head maid of the Gremory Clan, and her silver eyes focus on the final steps of the delivery. Though this may be her first child, thankfully her mother in law has gone through this once before around 550 years ago with her first son, Sirzechs Lucifer.

 The female Doctor delivering is grasping the child about to fully emerge and then said.

 "Lady Grayfia, one last push, just like that, Ah, here it comes! Congratulations Lady Grayfia, he is a healthy looking baby boy!"

 The Nurses scramble to help with the umbilical cord, as the child has finally come out. One nurse uses a soft cloth to clean the child, while the Doctor cuts the cord. The child had not cried yet, and after cleaning its mouth, she gently spanked the bottom to get it to cry. Smack!

 "Waaaahhhh~!" "Oh, no... Everyone get back quickly!" "He-He is floating!" "T-That is the Power of Destruction! Move now..."

 After the spank, the child's body floated in the air, transformed into a mix of black and crimson demonic energy, with two red pinpoints of light for eyes.

 It was only a child shaped mass of radiating Power of Destruction that slowly ate away the bed, tiles of the floor and ceilings, and anyone who does not have the Power of Destruction.

 "Waaaahhhh~!"

 As the baby's cries continued, more and more uncontrolled power leaked from the small baby. With a smile, the baby's grandmother reached up and cradled the small mass of demonic power, and held it in her ample chest, gently speaking to the baby to calm its fright. She said,

 "My beautiful baby boy, grandma is here, just sleep my love. That is right, relax and rest, you did very well, and grandma is pleased."

 At this point the tired silver haired mother called in the two nervous people who only saw the event from the door frame when they heard the Doctors panic.

 "Sirzechs and Duke Gremory, please come in and see my son."

 Sirzechs Lucifer (formally Gremory), the Devil King of Domestic Affairs in the Underworld (hell), is a handsome looking man with long crimson hair and blue-green eyes. He looks to be only in his early 20's. He is also the husband to the silver haired mother that called him to come in. Not only is she his wife, but also his Queen.

 The next man at Sirzechs side is the father of the child, Duke Zeoticus Gremory. His long Crimson hair flows down, and his light blue eyes scan his wife, and then the small child in her arms.

 He smiled seeing the child covered, no, made of pure Power of Destruction, like his oldest son had been at birth, and knew his grandson was blessed by the Morningstar himself. 

 The mother to the newborn baby is named Grayfia Lucifuge. Her silver hair matches well with her silver eyes, giving her a very pure and mature charm. She was stripped of her noble privileges during the Civil War and entered the services of the Gremory Clan, then becoming Sirzechs Queen and then wife. 

 The woman holding the baby boy is Venelana. She has long brown hair and violet eyes. She is the mother of Sirzechs and grandmother of the newest addition to the Gremory clan. Also wife of Zeoticus.

 As Venelana calmed the child, it's aura began to reseed. And soon, as the baby's eyes slowly started closing from all the exhaustion and crying, the Destructive Power fully changed back into the body of a healthy baby with a dash of crimson hair and crimson eyes trying to understand what it was seeing. He also had two thick black lines under each eye. Its fine as some devils are born with horns, marks and other things. Venelana said in her soothing voice.

 "My grandson, just sleep, and have sweet dreams, grandmother will protect you."

As he fell asleep Vanelana gives him to his mother Grayfia who is happy she can finally hold her son. She smiles softly and softly caresses his hair.

 Sirzechs who saw the birth and the baby's transformation, now knows what his own birth looked like. He now understands his fathers stories about the mess he made. Most of the objects in the room had parts of its matter obliterated to nothingness. Then he asked his wife, while kissing her forehead.

 "Dear, what name will you give our son?"

Grayfia kissed the top of her baby's head and told everyone.

 "His name will be Lucien Gremory. As he is the light of my life."

 Everyone looked happy with the name, and both men gently pinched the cheeks of the now sleeping child. Sirzechs sighs and says.

 "Sigh, I am both thrilled and disheartened that Lucien is also born a Transcendent Being. This now makes 3 Super Devils in the Underworld. The Great King Faction will not be happy with Lucien being as strong as I was when I was born."

"And if he gives you or Lucien trouble, son?" Zeoticus asked.

Sirzechs' face darkened. His eyes flared crimson as the Power of Destruction began to coat his body, and the room itself trembled in his presence.

"I don't care who it is. Anyone who causes problems for my son will be destroyed. I'll remind them why I am called the strongest devil in existence."

As Sirzechs spoke, the building shook and the study started to crack and crumble around them. Then, like a switch flipping, he saw his baby smile in his sleep. Everything softened. Sirzechs rushed to his son, snapping pictures from every angle — already picturing the boast to his fellow Satans about how cute his child was.

 "Will you tell Zekram Bael now? I will tell his son Lord Bael." Zeoticus asks.

 "Yes, if grandfather finds out from the grapevine and not be informed, he might feel more slighted. But I know Lord Bael will be extra upset, now that both of mothers children are so strong at birth, sigh." Vanelana says.

 "Alright all of you, Lucien and I need to sleep. Sirzechs, please give me the Phoenix Tears so I can recover my body." Grayfia says.

 He then pulled out a small red crystal vial, and dropped the magical dew onto his wife, whose body glowed and returned to a state of not even having a child. However, the magic cannot recover spent Stamina or Demonic Power, so Grayfia needs sleep.

Soon, the biggest news in a long time swept over all of the Devils domains. In fact, the shock of another Super Devil being born made even the enemies of the Devils become nervous. The Fallen Angels who lived on the opposite side of the Underworld, hated this news the most, while Heaven seemed to not want to make public opinions. Some have tried to say that it was not true, but in time, the facts would not be hidden.

 In the following weeks, many factions and noble families made a beeline to the Gremory Territory to see and greet the child and family, to trade in business, confirm the rumors, plus suggest possible concubine-servant and marriage ties.

 Families such as the Phenex, the Abaddon and the Glasya-Labolas were just a few of the families bringing over their High Ranking baby girls, business deals, and gifts to introduce to Grayfia for a marriage. 

Zekram Bael strongly 'suggested' that Sirzechs, Venelana, and Zeoitcus Gremory seriously consider the woman who is visiting from his faction.

Grayfia refused to set up a marriage so soon and rejected everyone. While Zekram was angry at this, he smartly left the matter alone the moment he felt Sirzechs leaking his power when Grayfia explained her stance.

About a month later, Ajuka Beelzebub's wife and queen, Celene Agares, gave birth to their daughter Latia Astaroth. She wasn't born a Super Devil, but both parents were overjoyed with their first child. Like Sirzechs, Ajuka immediately threatened anyone who tried to arrange a marriage for his daughter and rejected them all without hesitation. From that day on, Latia was officially declared the heiress of the Astaroth clan.

A week after Latia's birth, Sirzechs and Grayfia arrived at Ajuka's mansion. Grayfia was holding her son Lucien, who looked around curiously at everything in sight. A maid opened the door, bowed to them, and led them to Ajuka's study.

Walking in, the Beelzebubs greeted them warmly. Celene smiled as she brought her daughter closer to them.

"Welcome, Sirzechs, Grayfia. Please meet my daughter, Latia Astaroth." Ajuka introduced proudly.

Sirzechs grinned. "Your daughter's adorable, old friend, but not nearly as cute as my son. Just look at him." He started pinching Lucien's cheeks with a big smile.

Lucien rolled his eyes and tried to move his head away.'I've only been alive for a month in this new world. That dark place I was in must've been my mother's womb. Being born was one of the most terrifying experiences I've ever had.'

'Still, I'm in the world of DxD now, with a loving family, real magic, and power all around me. The only problem? My father — the strongest devil, Sirzechs Lucifer — won't stop doting on me. I haven't seen Rias yet, so I'm guessing I was born before her. Meaning I've got his full attention until she arrives… then I can finally pawn him off on her.'

Lucien looked over at Latia, who was giving him a gummy smile and trying to reach for him.'Guess this is an A.U., since Ajuka didn't have a daughter in canon — Latia was supposed to be his cousin or something.'

Seeing their children babbling and reaching for each other made both mothers smile.

"It seems my Lucien has already made a friend," Grayfia said softly.

"This is wonderful. Maybe they'll grow up to be as close as we are," Celene added.

The two mothers placed their babies in a small playpen nearby before sitting with their husbands to watch them.

Ajuka smiled at the sight before turning to Sirzechs. "Alright, what have you really come here for, Sirzechs?" he asked dryly.

"Can't a man introduce his child to his best friend?" Sirzechs said with an innocent smile.

Ajuka rolled his eyes, earning a small laugh from Celene. "You could… but I already saw Lucien when I examined him at birth. He's the same as us — a Super Devil. So I'll ask again, what do you want this time?" He sighed.

Sirzechs's expression turned serious, and Grayfia followed suit. "You've already seen how many devils are trying to arrange marriages for our children. And since Lucien was born a Super Devil, even the Great King Faction wants to get their hands on him. I'm here to cash in that favor you owe me."

Ajuka blinked. "Favor? That was a joke, Sirzechs. I didn't even think I'd ever have a wife, let alone a daughter — and now you want me to decide her fate based on that?"

Sirzechs sighed. "I'm not saying they need to get married right now. Let them grow up together, become friends naturally. If they develop feelings later on, then we can talk. If not, we forget about the whole thing. No announcements, no pressure."

Ajuka and Celene exchanged looks, and after a moment, they both nodded.

"I trust you, Sirzechs. Besides, I'm tired of rejecting proposals left and right," Ajuka admitted.

"Thank you, my friend. You won't regret this — just look at them." Sirzechs smiled, pointing toward the playpen where Lucien and Latia were babbling at each other. Grayfia was already taking pictures.

"Make sure you send those to me," Celene said quickly.

"Of course," Grayfia replied, taking even more photos.

Lucien suddenly got a small slap to the face from Latia's flailing hand. He froze for a moment, feeling a sudden chill crawl down his spine.

He slowly turned to see all four adults staring at him with knowing smiles.

'Why do I feel like they just plotted something against me…?' Lucien thought with a deadpan look.

Five years passed, and Lucien had grown into a handsome young devil. In that time, he'd met the other Satans and many of the Gremory clan's allies.

Meeting the other Satans had been… an event.

Serafall had immediately tackled him the second she saw him, squealing about how jealous she was that Grayfia had such a cute son. She swore she'd make him into a "magical boy", making Lucien shudder in horror until Grayfia's sharp glare froze Serafall in place, forcing her to release him. Falbium, on the other hand, barely greeted him at all—he just gave Lucien a lazy pat on the shoulder before falling asleep while still standing.

Despite the chaos, Lucien made a true friend in Latia Astaroth. Since they'd grown up together, the two had become inseparable—something that delighted both the Astaroth and Gremory clans. Lucien still didn't know about the marriage arrangement between them.

While training their clan traits, Lucien discovered that Latia had inherited both sides of her bloodline. The Astaroth side gave her mastery over seals, allowing her to manipulate different magic systems' sigils so long as she understood their structure. The Agares bloodline granted her time magic.

Lucien remembered a character from an anime in his past life—Julius Novachrono from Black Clover. The idea of his magic and fighting style fascinated him. He told Latia about it, suggesting she might be able to develop something similar using her own powers. She'd been thrilled by the concept, and when Ajuka heard about it, his curiosity was piqued enough to help her refine the idea.

It had only been a year since Latia started training, but her progress was incredible. She could already create two Chrono Stasis fields—areas that trapped objects in a repeating time loop, forcing them to relive the same moment endlessly. The spell took a heavy toll on her, but Lucien believed it was only a matter of time before she surpassed Julius himself. With her bloodline and Ajuka's guidance, it was practically guaranteed.

The most exciting thing that year, however, was the birth of Lucien's aunt—Rias Gremory.

Lucien now sat in the Gremory manor's living room, holding the red-haired infant in his arms while the rest of the family smiled warmly at the scene.

Rias giggled and babbled happily, and Lucien couldn't help but tickle her tiny hands."You know, it's kind of weird that I'm older than my aunt," he joked.

The family laughed."Not really," Grayfia said calmly. "In devil culture, it happens more often than you'd think."

Venelana smiled, sitting beside her grandson. "Don't forget, Lucien—it's a miracle I even gave birth again. You know how long it takes devils to conceive. Your father is five centuries older than you, and it still took this long for Rias to arrive."

Zeoticus chuckled heartily. "Hahaha! That Sebastian fellow is jealous my daughter was born first. There's still about a month before the Sitri heir or heiress arrives!"

"Yes, and Serafall's been running around bragging nonstop about her soon-to-be sibling," Sirzechs scoffed playfully. "She honestly thinks that child will outshine my Lucien or Rias."

Lucien rolled his eyes. "Dad, why don't you hold Rias? She's been staring at you for a while now."

Sirzechs immediately stopped what he was doing and gently took Rias from his mother's arms. "Come on, little sister—say 'big brother,' will you?" he teased, tickling her as she laughed. Everyone sighed in unison, silently wondering how this man was one of the leaders of devilkind.

Grayfia looked at her son knowingly. "You did that on purpose, didn't you?"

Lucien smirked. "I did. Thankfully, Rias was born—now maybe Dad will stop smothering me. I love him, but between him and Lady Serafall, I'm getting hugged to death."

Grayfia smiled and patted his head. "Don't forget, we're heading to Lord Beelzebub's laboratory tomorrow to get your Evil Pieces. Are you excited?"

Lucien's eyes lit up. "Yes! I just hope I get at least one Mutation Piece like Dad."

"Of course he's excited," Zeoticus said proudly. "He's getting his Evil Pieces earlier than most High-Class devils ever do."

Venelana nodded. "It makes sense. Lucien was born a transcendent being—just like his father. If Evil Pieces had existed back when Sirzechs was born, he'd have received his early too."

Lucien smirked confidently and pointed his thumb at himself. "Get ready, Dad. I'm going to form my own peerage, become stronger than you, and take your title as the strongest devil—and my team will be the strongest in history!"

The room went silent for a moment, everyone stunned by his bold declaration. Then Sirzechs laughed proudly, handing Rias back to his mother before kneeling to Lucien's level.

"I'd be proud to see you surpass me, son," he said with a warm smile. "Maybe then I can finally relax—and give you a sibling."

Grayfia's face turned red, and she instantly punched Sirzechs in the back of the head, sending him face-first into the floor and cracking it."Sirzechs! Not in front of our son!" she yelled.

Lucien groaned. "Gross. I did not need to hear that. I'm going to bed. Goodnight, everyone."

The family laughed as Lucien walked off.

Every maid and butler he passed bowed respectfully as he made his way to his massive bedroom. Once inside, he locked the door and sighed. His room looked like something meant for royalty—spacious, ornate, and far too elegant for a child.

"It's a good thing I've gotten used to being rich. This was intimidating the first time I saw it… Now I know exactly how Issei felt," Lucien muttered.

He changed into his sleepwear and laid down, staring at the ceiling before closing his eyes.

'Once I get my Evil Pieces, I'll start gathering my future peerage… I just hope they'll accept. Since I was born five years before Rias, most of the people I know from canon aren't even old enough yet. I don't want to take Rias's future members either—she's family, and I won't steal from her. Hopefully, she listens to my advice and trains seriously.'

With that last thought, Lucien drifted off to sleep.