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Heroic Heir in DxD

High school student? Check. Heir to a human organization that deals with the Supernatural: Also check. Young Castiel Emiya, son of Shirou Emiya, lives what some might consider a double life. Involved with the supernatural since birth, how would he affect the world of DxD? Let's find out! (DxD fic with multiple elements and characters from other stories including some wuxia elements like Spirit Bones from Doulou Dalu, slight bashing on the start of some DxD characters, Harem)

kingCH · Others
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56 Chs

chapter 29

3° person P.O.V.

"Koro, BERSERK MODE!"

At that instant, a surge of power was felt throughout the whole field. The originally white mass of destruction went still for an instant, then he started to change.

His fur turned blood red, his body, previously round, turned muscular and grow to a 5 meters tall being and his originally round face gained a more canine appearance.

The Sister's project may be the masterpiece of the homunculi department to normal homunculi, but when Koro is on this form he is the absolute best that they ever produced for destruction.

A weapon of mass destruction that carries in it the same skill that was the trademark of the berserker servant.

Mad Enhancement.

And one of rank B+.

"RRRRRRRRRRROOOOOOOOOOOOOOOOOOOOOOOOAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAARRRRRRRRRRRRRRRRRRRRRRRRRRRR"

As soon as the transformation ended he roared as loud as he could, and by loud it means LOUD.

It was so high that everyone in the field could not move due to the pain on their ears, paralyzing all of them for some time. The most affected were those three Bao's and Okuyasu due to their proximity, it was so bad that their tympanum was ruptured and blood started flowing out.

Koro did not think of Okuyasu when he liberated that roar, he just could think of two things:

-Save Seryu;

-KILL!

And that he did. He launched himself five times faster than before towards the monstrosities that were approaching Seryu before. They would not be moving towards her again.

When he landed he first used his hand to catch the Crab by the head and squeezed as hard as he could.

SQUIIIIIISSSHHHHHHHH

The Crab one had his head squeezed into a bloody pulp, brain matter and bone pieces falling across the ground. With one movement he was thrown into Koro's mouth.

CRUNCH CRUNCH CRUNCH

Tree bites were all it takes to be swallowed whole by Koro. But it was not enough to satiate Koro's rage. It was far from enough.

The Shrimp tried to punch him with all his power, but the result was that his own claw's carapace broke while Koro did not feel a thing. Surprise showed in the Shrimp's face, and that surprised face was what stayed as his last expression as Koro backhanded him in such a forceful way that the upper part of his chest was sent flying separately from the rest of the body. Blood and bits and pieces of organs flew everywhere

Seeing this and feeling despair despite his low intelligence the Big Mouth one tried to bite down Koro's arm, but if before he could manage to chew it right away now he could barely scratch Koro's fur.

Feeling this 'fly' trying to bite him Koro lifted his arm that Big Mouth was biting and decided to show how someone should really bite.

CHOMP CHOMP CHOMP CHOMP CHOMP

This one was a bit harder to chew as his flesh was quite hard but it was eaten all the same.

It was not enough.

It was far from enough.

Koro saw that there was no longer any enemy around him so he jumped towards those last few empty humans. They stood no chance. No magic could invade his body and he would move as faster than sound, making detecting his movements by sound alone impossible.

With one punch he smashed the first one in the ground in such a way that all that could be seen was a crater. He followed it up by using both hands to catch more two and used them like a kid does when he is making a small ball of paper, eating this 'snack' after it got as small as possible.

The last one was caught on Koro's hand as well, but before he could be killed the empty human decided to go for self-destruction as this way he might wound his opponent, which he succeeded as he managed to destroy Koro's hand… that was regenerated in the following instant.

More

It wanted more

More bloodshed

More meat

More fight

More destruction

More

MORE

MOOORRREEEEE

RRRRRRRRRRRRRRRROOOOOOOOOOOOOOOOOOOOOOOOOOOOOOAAAAAAAAAAAAAAARRRRRRRRRRRRRRRRRRRRRRR

As he started searching for more he saw that in the distance, on the burned corpse of one of the empty humans something was growing. It was Bao. He had put his cells into the body of all those empty humans long ago to, in case of their death, use them as fertilizers to grow more bodies.

A wild grin appeared on his face, with many, many rolls of pointy teeth on it. A new meal/enemy was there.

Koro jumped with all his strength, reaching such speeds that many sonic boons happened one after the other.

CHOMP

Koro did not wait for Bao to finish forming and with one bite he devoured him and the corpse whole. He started looking around, hunting for more prey, when

PSSSSSHHHHHHHHHHHHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

He started liberating a large amount of steam. So much so that his entire form was clouded by it.

After a few seconds, the steam dispersed showing a downed Koro in his small form. Anyone that looked at it like this would not associate it with the monster of carnage that was running throughout the field a few instants prior.

Seryu seeing this could only release a "Tch." Before she too passed out.

The only one in the field right now that could move, even if barely, was Okuyasu. He tried to stand up, but due to his ears being busted as they were he could not get balanced at all. After he failed to get up after the third time he started dragging himself to Seryu to check if she was okay.

He would not let someone else die in front of him. The image of the Sister dying because he failed to detect that bastard was engrained in his head.

That will NOT happen again.

As he approached her he saw that she was with many broken ribs and that her mechanic arm was destroyed. That was not a good thing, but so long as she was not dead it did not make a difference for his power.

"THE HAND" Saying that he pressed his left hand on Seryu turning back her time to the point where she was no longer wounded. (He could do this only for those who were alive so that is why he did not do it for the Sister)

After all her injuries recovered she started stirring up and after some time she managed to wake up again. She started moving her mouth, probably talking something but Okuyasu had hurt his ears badly during Koro's roar earlier he could not hear anything.

Seeing that she was trying to communicate Okuyasu pointed to his ears and shake his head indicating that he could not hear a thing. Realizing this Seryu make a surprised face for an instant before she nodded comprehending the situation, she then took a small syringe from one of her pockets and injected him with it.

He did not like that, needles are SCARY.

"Ouch, what you are doin… hey, I can hear again." Okuyasu said happily, almost jumping out of ecstasy of hearing everything around him once again. Being in complete silence was NOT good, honestly, he got a whole new respect for those who had to live like that. Those were true mans of valor... or woman he won't judge.

"I'm glad you liked it. This thing here is phoenix tears, we put them into these syringes because this way there is a much lesser chance of them breaking during a fight, these are made to survive without breaking after all." Seryu said with a smile. She always liked to help her companions in her fight for JUSTICE after all.

Okuyasu seeing that the mood was better now and that there were no more enemies, decided to ask.

"Hey, why didn't you activate that Berserk mode thingy before? It would have helped a lot you know?"

A sad and self-mocking smile appeared on her face as she shook her head.

"I did not do it because it is an emergency mode. It forces him to liberate all magic and power that he accumulated with time in one instant by using my own vitality. Unfortunately, it doesn't last very long as I don't have magic to supply instead, so whenever we use this mode it only lasts around 20 seconds and we both get out of commission afterward. I can only talk right now due to you healing me, but I can't even move right now properly." She explained. It made sense, such a power would most likely have drawbacks.

"I get it. So you are like one of those super-heroes from TV when it is about this?" Okuyasu asked, failing to notice that she seemed to exude an aura of pure happiness for being called a hero. That was her dream, after all, being a true hero of JUSTICE is what she would do… and marring Castiel. What? She is a girl too.

"I-I hope I was more of a hero. I still have much to learn, but I will try my best." She said excitedly and with a bit of embarrassment.

"Arere, good for you to think like that."

And with that the mood got a whole lot worst a whole lot fast.

That was not the voice of either Okuyasu or Seryu. There was only one person in there that had such a voice and way of talking.

Bao.

He appeared again, rising from the crater that Koro had punched and splatted one of the empty humans. The scariest part was that despite just getting up he seemed to already understand everything that happened.

That was because he did. All cells from Bao could store part of his knowledge and whenever one died part of those cells would spread through the air making it so that other Bao's could understand all that the dead Bao understood.

Okuyasu stood up in front of Seryu as he could not allow her to get in the middle of this fight anymore. As she said she could barely move at all so she was defenseless and he would not let her be killed.

As he stood there looking at Bao he started circulating his Ki and trying to use that trick that one of his masters had taught him long ago. It was to release a small amount of Ki throughout his body in a way that it would bounce back from any object he touched, basically a sonar. It was not quite practical for him yet as he needed to focus on it to work and stay in the exact same spot, his masters all could use this while moving no problem.

This move is called Seikuken. (writer note: this is a modified version of the Seikuken from Strongest Disciple Kenichi universe. It is not the same but has a greater range)

Using this he noticed after a second that there was not only the Bao in front of him but also two more inside the crater finishing being 'born' and five on his surroundings, all places where there was enough 'organic matter charged with energy'. He was being born from the one that Seryu shot before and from the corpse of the Shrimp, but considering how slow he is being in being born in the Shrimp one the cells on him are probably quite a few.

This is bad news as he himself is not in his full power as he needed quite a bit to NOT be toasted by Skin's thunder armor. He had round 60% right now so he needed to be careful.

"This is a problem. I was supposed to eliminate witnesses AFTER you guys got killed as they would work as cannon fodder, now I have to do all the work." Bao said with a sad tone, showing sorrow even, but not for his companions but for the extra-work that he was going to have to do. His mission was to get his enemies and allies killed so as to retrieve the corpses of the enemies without the priest that ordered their death knowing. That was what doctor Blank ordered to him after all, the capture of the bodies of all those interesting, enemies and allies alike.

For the doctor it was all for science, for Bao it was just a mission.

Hearing this words from Bao made Okuyasu very mad. He always hated this kind of scumbags, and Bao was proving himself to be a prime example.

Bao then started walking towards Okuyasu while caring a light gun and a light sword. It was slow at first but it quickly started turning into a sprint and when he was around ten meters away he jumped to get Okuyasu attention so as to make him miss the other Bao on the far right with a gun aiming for him.

However, thanks to the Seikuken Okuyasu was aware this time, and he would not let him get away with it.

Using his right hand, he scraped away the space between him and the Bao on the far right, forcing that Bao to be launched to close proximity. Seeing himself suddenly in front of Okuyasu he did not get surprised, instead, he used his light sword to try and cut him while also going for a low kick so as to hit his legs. This way he would impact Okuyasu in some form and that would raise the chance of a successful mission.

Okuyasu, however, was not so easy to deal with. He may have stopped the Seikuken (he moved after all) but he still had extremely well-honed instincts. It was those instincts that allowed him to jump above the said kick while using his right hand to scrap away the light sword and Bao's head in one move.

Seeing as he eliminated his first opponent Okuyasu did not get excited about it. He knew that the one that was still in mid-air was closing in so he turned around and with another swipe of his hand he managed to bring that Bao close and using his left hand he executed a palm strike to Bao's head, making his brain turn into mush and killing another one.

BANG

"Shit, that hurts you fuckers!" Okuyasu said as he got shot in the back by a light gun from one of the other Bao's that was a far distance away. It didn't hit any serious point, due to dumb luck mostly, but there were two problems. The first was that now he would start losing blood and the second problem was that Okuyasu had a distance limit of 30 meters of space that he can scrape to bring his opponents towards him. It was due to a lack of the necessary Ki and magic capacity; he simply did not have the energy necessary to make it have a greater range.

Seeing no other choice, he did what he could and started focusing his Ki to make one strike that would end that opponent while maintaining himself on a position that he could protect Seryu.

Staying in front of her he started focusing partially on a new Seikuken and the rest of his energy was to make his next attack. A good decision since he felt one of the Bao's trying to get out of that crater to shot him.

BANG BANG BANG

Three shots were made by that Bao that managed to wound his back, all aimed at vital spots that would not overly damage the body afterward, like the inferior vena cava and liver. Okuyasu managed to use small Ki blasts from his left hand to disrupt the path of the bullets, a much more economical way to deal with this as it did not spend that much Ki to do it. (Writer's note: these Ki blasts are equivalent to mana bursts, but the scale is much smaller and they spend much less making it possible to use by those that do not have gigantic reserves of Ki)

Finished charging his power on his right hand he raised his hand to the air and shouted.

"DESTRUCTO DISK"

A disk made out of concentrated Ki appeared on his hand, it was inspired by a bald human that could fight side by side with the strongest warriors from his favorite anime. He launched it towards the Bao in front of him and it almost instantly managed to cut him in half.

The Bao behind him, thinking that it was a chance as his opponent was with his back to him went for a dash and cut aiming for his neck. The speed of the dash was amazing, but it was still to slow as Okuyasu did not even need to do anything but crouch and move his fingers.

CUT

That Bao was also cut in half. The momentum of his dash was so high that is body kept coming and it ended up right in front of Okuyasu, splashing some blood on his shoes.

"Grulgh… no, keep it together. You can let yourself vomit later, but now you have to be strong." Okuyasu said with his face turning green. He may be killing them now, but it was just because he knew there was no other choice as he normally would much rather just imprison them.

Now there was only one more enemy. The last one that finished forming on the crater.

"This is hard. It seems that the mission will fail, good job for that girl in especial if it wasn't for that weapon of hers you would all be dead. Congratulations." Was what the final Bao said while getting out of the crater. "It really is a shame. If we weren't in this field I would have won in the end, really a shame. But hey, thinking on the bright side I managed to get you both too tired to do interfere afterward." He said with a smile *fake* on his face.

"Ha, I am still great here. As soon as we get out I will go and help the others." Okuyasu said with a smug smile on his face while reading for one more strike. He just had roughly 35% of his Ki now, but if h could meditate a bit and rest he could go back to 70-80% no problem.

"That would be a problem. If you do go there you will possibly ruin the mission." Bao said with a troubled face. Then he seemed to have gotten an idea as he joined his hand and got a bright smile. Normally smiles would show happiness, savagery, even evil intention, but this one did not show any of these. It was artificial as if it was all an acting. It unnerved anyone that saw it. "And if I do this."

Then, something unexpected happened.

The upper part of Bao's body that was on Okuyasu's feet suddenly exploded in spikes perforating Okuyasu's leg and torso in many places.

"Gargh." Was all the sound that escaped Okuyasu's mouth as he gurgled on the blood that was threatening to get out of his mouth. The pain was all-encompassing, but he held on. His Ki going into overdrive to keep him awake and sustain any damaged organ.

"Oh, it was weaker than expected. But again neither I or I had a lot of biomass and mana when we were born so getting this much is good enough." Seeing the questioning look on Okuyasu's face Bao decided to explain. "You seem confused, but it is not overly complicated really. I am a person that was fused with a coral and as such can grow indefinitely as long as there are enough materials to sustain such creations. But it was not all we can do, by stimulating the mana we carry on our bodies at once we can turn into literal corals that can pierce through the flesh of most with no problems if there is enough mana this spikes can be much bigger and resilient so that it can pierce much better. We did not do it earlier because you never had one of us close to you time enough for this effect to work, but you let your guard down as you let one corpse near your feet for too long." Bao then started walking towards Okuyasu normally, no hurry or anything as he knew that this level of blood loss would make anyone enter in shock in a question of seconds. "Now if you could stay like that without moving anymore I would really appreciate it as it would let your body to have fewer wounds. And now to finish out the girl." Seryu could not do anything seeing Bao approaching, she was too weak and just keeping conscious was her absolute limit.

However, what Bao did not expect was how tenacious Okuyasu was. He was trained by 'monster' for a long time and would not die to something as insignificant as this.

When Bao reached the thirty-meter distance from Okuyasu, while ignoring the spikes that tore through his flesh, Okuyasu swiped his hand forcing Bao to get in front of him… right in the middle of all those spikes.

Bao could not do anything as the spikes entered him in much worst places that they did Okuyasu. Blood started leaving his body as it started to shut down, but Bao did not seem to care in the slightest… no this is not exactly right. It was not that he did not care in the slightest as he did feel bad for one thing, that he did not complete the mission.

After Bao died the death arena finally stopped working as there were no more enemies to face. So a girl that could not move and was closed to pass out, a small *dog* and a man covered in wounds suddenly appeared in the middle of the street while a group of policemen was investigating the place for the explosions that happened.

One of the cops seeing them started to panic as he ran to them. Seeing their states he did what was right as he tried to call the hospital when-

Someone chopped his neck, making him pass out.

"That will not be necessary. Now what do we have here, this girl seems to have exhausted most of her vitality but she just needs to sleep. And for you, it seems that there are quite a few wounds on your body. Well, it seems that you are in luck as I just happen to be a decent doctor. But you already know me well, don't you agree my disciple." The man that said that was wearing a hakama and had black hair with eyes that were very close to pure white.

With the last vestiges of Okuyasu's mind that were awake, he felt a mix of extreme dread and relief for the one that appeared. After all, he was beaten to the point of near death and the one that was there now is none other than one of his masters, Akisame Koetsuji.