The previous version was honestly crap and doesn't make any sense at all. So I decided to remake 'Son of the Trinity' into a newer version. Has been proofread by my friend so it should be okay now... I think.

Prologue

-3rd person pov-

In a world somewhere, one of the Guardian of Akasha is experiencing one of the greatest day of his life. One of the Genesis Trinity, Morimiya Kazuya, is about to witness the birth of his second child from his first wife. It was in truth the third child from his first wife but their first and second died without even reaching three years old due to being killed by an enemy when they were busy. It was due to having a second wife who already gave him a daughter who is safely living in his second wife's homeworld that they tried for a third time, this time intent on keeping their child safe.

After long hours in labour, Morimiya Shijou Momoka, former headmistress of Subaru Magic Academy and currently the strongest spatial mage who is also wife to one of the Guardian of Akasha known as the Genesis Trinity finally gave birth to a healthy baby boy.

Momoka felt happy as she touch her child. There was only two other times she had felt so happy and that was when she gave birth to her first and second child who sadly died due to their carelessness which she regrets even now. In her heart, Momoka swore that she will protect this child no matter what happen. She will not fail him like she did with her first and second. Kazuya and his second wife, Serafall Leviathan or Morimiya Sera as she is known by the other in Genesis Trinity, smiles as they watch Momoka cradling her child with a blissful expression.

Regretfully, the happy moment did not last very long as the ceiling suddenly exploded.

"Momo!"

Kazuya shouted.

"Ufufufu, I found you."

A sweet and seductive voice was heard from the hole that was once the ceiling of the Morimiya family house. Kazuya widened his eyes in fear as he recognized the voice of his supposedly dead archnemesis.

"No… I killed you eons ago!"

The smoke died down to reveal a female approximately fourteen years old with bewitching beauty and long, golden hair wielding a golden sword made out of light. She has a very sadistic look on her face.

"Ohh come now dear, you do know that I am not one to stay dead. Besides, I can never be killed."

The golden girl said in a sultry tone.

"Kazu, don't tell me… she is…"

Serafall look up to the girl, her instinct honed through experience screaming at her to run as far as she can.

Sekina, the Golden Witch of Genesis, once the leader and strongest of the Genesis Trinity, she fell into madness after her love was rejected by Kazuya's predecessor. Once occupying the seat of Genesis, Kazuya's predecessor, the one who once occupied the seat of the End out of three seats struck her down and sent her deep into the abyss of beginning in hope of killing her but he also died in the process. Kazuya who was still new and had just took on the mantle of the Third Seat that signifies the End fought against a resurrected Sekina and finally triumphed at the price of many of his comrades and loved ones eons ago. Now his greatest nightmare had returned once again for revenge.

"Sekina!"

Kazuya shouted as his skin turns dark and his hair turns white. He then draws a crimson sword out of nowhere and points it at the golden girl.

"My my, so scary."

"Nothing is too much when it concerns you, Sekina."

"Kazu!"

Before Serafall can act, Kazuya had already charged at the golden girl.

"Too slow, you've grown rusty. Nevertheless, it would be hard for me to triumph against you right now. Besides, I have another matter to attend to."

"Then what are you here for?!"

"Isn't it obvious? To make you despair and… for your successor."

Kazuya widened his eyes as he realized what she meant by that. He immediately look around for signs of Momoka and the child.

"Too late [Cage of Paradise]"

Before Kazuya and Serafall can react, the two of them found themselves trapped in a golden cage. Kazuya recognize this as the strongest trap spell in Sekina's arsenal and would take using his full power to destroy it, even then, it will take around ten minutes, enough for what she plans to do.

"Noooo!"

"Momo-chan!"

Sekina dashed at Momoka who emerged from the rubble, holding her son in her left arm, safe under the protection of a blanket she created and laced with her power. Momoka is still panting from the fatigue from giving birth but she has changed into her battle uniform which is Wizard Brace's blue military uniform with the addition of a black cape adorned with Kazuya's crest.

Momoka blocked the golden sword with a red and black wakizashi, her weapon she named 'Sophia' after her best friend. Unfortunately for Momoka, her condition and blocking a large sword swung with full power while she blocks with one hand sends her flying to the sky. Momoka, knowing that she cannot win, no, she won't survive at this rate, opens her Black Door to transport her somewhere else. Sekina gave chase.

As the two disappear, Kazuya screamed in anguish as he and Serafall attacks the cage formed by Sekina's magic.

"MOMO!"

"MOMO-CHAN!"

-dimensional gap-

Momo keep parrying Sekina's attacks as she navigate through the dimensional gap, trying to think what to do. Great Red who claimed the sector around Serafall's homeworld should be nearby so maybe she can get the dragon's help… if she could survive that long. The one who currently occupy the seat of Genesis is busy in Akasha while the Primordial Mother of Dragons who occupied the second seat, the Seat of Infinity, is at the other side of dimensional gap, too far to get to her on time. Ophis, the second seat's daughter, is not as far but she would have better luck with Great Red. Momoka knows that she is in a pinch. The enemy is underestimating her but for good reason. She is tired and weakened after labour. Even for someone like her, child birth is still the most exhausting thing in existence, not to mention still painful even if it is the third time.

"Ahahahahaha! Not bad, even in that condition, you're still strong enough to parry my attacks! Let's take this up a notch chall we?"

Golden magic circles began to form around Sekina in hundreds. Momoka realize that she will die at this rate. Momoka then push her fatigued body and respond in kind by creating hundreds of black magic circles.

"{Golden Arrow}"

Sekina calls as numerous arrows of light shot towards Momoka.

"Guh… [Chaos Barrage]"

Momoka called as her magic circles began shooting black beams to counter Sekina's arrow of light, each with the power enough to destroy a sizeable town.

Sekina's barrage keeps getting harsher while Momoka's own began to dwindle.

'At this rate, my son will be killed!'

Momoka thought. That is the only thing she will not allow to happen.

"Ahahahahaha! Impressive, you can still fight me in that condition! You're a lot better than that bitch Carmellia!"

'I guess I have no choice.'

"Guess this is it… [Witch of the Night Sky]"

Momoka utter her last spell as she realize that she cannot survive until Kazuya and Serafall can break the cage created by Sekina.

She then opted for another ending.

As long as the child lives, she doesn't care about what happen to her. She will not let Sekina get her son!

As Momoka steeled her resolve, her body began to change. Patterns that resemble starry night sky began to appear on her body.

[Witch of the Night Sky] a mode that eventually earns her the title of the strongest spatial mage. It allows Momoka to bend space to her will. Her ability to cast spatial magic increased many fold and her defense also increased greatly due to the extreme spatial distortion around her created by her power. This is Momoka's conceptual magic that bends the area she had affected to her will and allows absolute control of space over that specific area by mere thoughts alone. Normally, this would put her on almost equal footing to Sekina or allow her to give Sekina trouble but the cost of maintaining such powerful magic is great and Momoka knew even this mode cannot beat Sekina even if she was at peak condition. There is a reason why it took everything of the new generation Genesis Trinity of that time to defeat her. At her current condition, she can only hope of using it as a barrier and to do what she plans to do.

Momoka stops her [Chaos Barrage] as she do a last desperation attack, ignoring all the golden arrows while putting everything into her one last charge and her baby's protection.

With her condition, Momoka cannot use her [Night Sky] mode to adequately protect herself and Haru from Sekina's powerful and relentless barrage. She instead redirect most of her remaining energy to her son's protection and her final magic.

"What?!"

Sekina was surprised at Momoka's sudden suicidal charge and was caught off guard.

"I can't defeat you nor drive you off with my remaining power. But I can at least seal you with my remaining power for many years to come! [Abyssal Door]!"

Momoka pour her remaining power that's not used to protect her child into constructing this last spell that bends the law of the universe and open a door to the abyss of beginning which is located in the deep end of the edge of the universe. Chains erupt from the enormous magic circle as it pulls Sekina down into the abyss.

It took Momoka everything she has to prevent Sekina from breaking free.

"Damn you Shijou Momoka!"

Sekina cursed as she was pulled into the depth of an endless abyss. Momoka smiles as she felt the last of her power leaving her. She is tattered and broken and she knows she won't survive. During her last attack, Sekina's arrows fatally injured her. Each arrows has the power to destroy a small town and she had endured hundreds of them. It is a miracle that she is still breathing.

Feeling her consciousness leaving her, Momoka began to fall, but not before opening a portal to the nearest world.

Shidou Touji, exorcist of Vatican happened to be there when it happened.

A rip in space appear and Momoka came crashing down to the ground not far from him.

He and his wife immediately ran to where Momoka crashed, finding her bloodied and battered. Momoka look at them.

"P-please… take care of him."

Momoka reach out to them.

"Him?"

Touji ask. Momoka reveals a baby wrapped in blanket now drenched in her blood.

"My son… I don't have much time left. Please…"

Touji's wife, moved by Momoka's plea, took the child into her embrace.

"Thank you…"

Momoka said.

"I will always love you… please be safe…"

Momoka then gave her child one last kiss on his forehead before she finally closes her eyes, her body disappearing in a burst of golden light which surprises the couple.

"Honey… she…"

"Whatever she is, I can't believe her to be evil. God led us to her to save her child."

Touji said to his wife.

"Yes…"

Shidou Aya then looked at the baby's face, cleaning his mother's bloodstain.

"He was just born, poor child."

"What will you do?"

"I won't deny her request. I don't know what happened to her and I don't care. Her last request was made as a mother. I will not deny a mother's request."

"Very well… I guess we will adopt him."

"Yes… we will adopt him…"

"What should we name him?"

Touji asked.

"Haruka… Shidou Haruka…"

Prologue done. Here the OC got adopted by the Shidou couple. Yup, the guy will be Shidou Irina's adopted brother. And if anyone finds the name Shijou Momoka familiar, she is the very same Shijou Momoka from Mahou Sensou. I like her very much since loli magician who are actually older than they look are my favorite type. Plus she has twintail, no reason to hate her at all. Ohh and minor spoiler but Sophia really is a character in Mahou Sensou LN for those who haven't read it. Sophia will appear in the second season of Mahou Sensou anime if there is any. Anyway, Shijou and Shidou sounds similar and I like Irina so I decided to have Haruka be adopted by the Shidou family. So how is it? Good? Please review since I am in desperate need of one after seeing my other stories seems like shit while King of Justice did good. Oh, and I want to write this one until Kokabiel arc before continuing King of Justice.