Authors Note : This is simply a Theory and its not perfect the only reason I'm putting this here is cause of a simple whim. This theory of mine can be used as a plot if I say so myself. Well then to those bored enough to read this without further ado

High school dxd theory

Humans cycle of reincarnation - once a human dies the soul will slowly leave the human body and go to certain place where the soul can be purified or cleansed of all its memory and impurity. Once the soul is completely purified and cleansed it will then be born as a baby starting a new life and this system should have continue to run forever but a problem occurs...

- if a human were to be born as a half(ex. Half angel, half devil etc.) cleaning and purifying it will take an absurdly long time thus causing a trouble in the system where a soul that should only stay there at a fix time ended up staying for longer. The soul of the half human will stay at the cleansing and purifying area depending on how strong the other half is. When the soul of the Half human ended staying for to Long the system will decided to just erase the not human part and try to creat another human soul by combing and fusing the other half souls. This is how I theorized how the system of reincarnation is running

Here is the problem that I stated In the first part...

The devils race "Evil Pieces" From what I read about it and was explain to me: it is an ingenious technique that can save the nearly extinct devil race from extinction. From what I know about it it is indeed something amazing and wonderful technique for the devil race. This is my theory on how the evil pieces system work:

- once a human dies the soul of the human that was still lingering in the will be tied and anchored by the evil piece so that it won't leave the body. But just tying the soul to body simply won't do it will just ended creating a soul that is tied down to body thus creating a ghost. (FYI a ghost is a soul that became to attach to one thing thus staying In the living world and not getting purified). Since the essential soul won't be living the body anymore all the devil have to do is to heal the cause of death of the human who died thus saving his life. That's right saving his life not becoming a devil.

In my theory the evil pieces have 3 things it needed to do so that it can turn a human soul similar to a devil

1 - by anchoring and tying the living soul to the evil piece

2 - to turn the dead body into something that can support and hold the new devil soul. In short obtaining or creating a devil body

3 - and the most important part, by corrupting the human soul and turning it to a devil soul.

By using These 3 steps we can summarized the use of the evil piece system

Now that you know how the system works. You should have already guess that if the evil system were to be used as simply life saving tool and forgoing the soul corruption it is indeed ingenious. But the question remains why was it created in the first place? To save the devil race from extinction. Thus corrupting the soul can be said to be the main reason it was created

Ps. A little about something that's out of the blue

Resurrection magic - is probably the main idea used to create the evil system and I believe I don't need to explain how it works right? If you don't get it here is the simple version Resurrection magic steps

1 - tying the soul to the body

2 - healing the damage of the body

3 - by waking the soul that is tied to the body

And viola that's the basic steps for it well I'm sure it's really all pretty complicated but that's not I'm explaining in this book so maybe next time

I already taught you how the human reincarnation system and the evil system work. So what do you think about it? If you are a smart person then you should have already a frown on your face or it is simply a perfect emotionless face because of what I explain. Well if you are an idiot then no matter how idiotic you are then you have to experience a sense of discomfort. If you don't have either of the 2 that I stated then I can only ask you: is there really something inside that head of yours at all? Well joking aside let me tell you why you should have experience what I stated above

The reason is simple...

Because the human reincarnation system and the evil piece system don't work together

They just simply clash. As long as both exist one day it will brought fort both of systems mutual destruction.

Why?

The answer is simple the evil piece system will cause the human reincarnation system to collapse which means the destruction of human race. Once the human race cease to exist the evil piece will then lose is function because there is no human to revive and corrupt thus meeting it's end.

But how will the human reincarnation system be destroyed by evil piece system? After all it is a system that is running since the beginning of human race you know? How can it be destroyed by a single new system?

The answer to that lies to the humans who were turned to be devils

Why?

When a devil dies what happens to its soul?

The answer to that is

Erased, annihilated, obliterated, destroyed Either of these will happen once a devil dies

But isn't there like a devil reincarnation system or something?

The answer to that is : None The devil race do not posses the reincarnation system because of 3 things

1 - if a devils soul is purified or cleansed it will lead to its destruction

2 - a devil will definitely not let the system erase its memory and will simply try to find a new body to live once again

3 -if there really is a system the devils will think that if they destroy it they can live for the whole eternity and not die

That's is how I thought the devil race do no posses the reincarnation system

But this isn't a proof of why there isn't any devil reincarnation system right? The reason why I thought like this is simple: if there is a devil reincarnation system then there is no need to create the evil piece system right?

If there is no devil reincarnation system then how can the devils give birth to a new life?

The answer to that is this

- The reason why the devil race as a whole have hard time creating a baby is because. For devils to create a new life is to create a new soul. For a soul to be created it needed the power. And it depends on the soul that will be created.

If that's the reason then why can't the devils create many soul then?

Devils can be called many things and they desire many things as well but there is no devil in existence that do not desire power and no devil would like to give their power to someone else their daughter or son is no exception to that. Because the beings known as devils is the one that crave power. If a devil wanted to create a baby without decreasing their power all they have to do is partake intercourse regularly but sending only drop by drop of power till a soul is created and to devils this method is perfect and something that all of them like because who would say no to a regular pleasure while maintaining their own power and creating is also the reason why there are some devils who did not inherit power that their clan possess

Now that you know how the devil creates life and what happens to a devil when they die. Then what is the significance of it to the human reincarnation system then? How can it affect the human reincarnation system?

The life and death of a devil does not affect the human reincarnation system at all But that is not the problem here the problem here is the evil piece system

The evil piece system is a parasite for the human reincarnation system.

Because the evil piece system is stealing the souls that should go the human reincarnation system and does destroying the cycle of the human souls

Even If humans who turned to a devil and become a devil won't that mean that they will just take a long time to be cleansed ?

The answer to that lies at how the devils dies

- which means the erasure of the soul

What happens when there is only few souls of humanity left?

The human reincarnation system will simply not work anymore

If there is no more souls why can't the humans just create more?

It is true that a human can create a soul but think of it like this: If a devil will need years or maybe decades for a devil to create a soul even by dropping a bit of their power for it Then how many years will it take for a human to create a soul when humans possess so little power in the first place? The humans can only become these numerous because of the human reincarnation system. The humans became this numerous because of millions of human is used by the system of reincarnation to create a new soul.

That's the reason why the evil piece system is something ingenious and wonderful for the devil and only for the devils

but for the humans? It is something that will cause their extinction Because they the devils is using us humans as sacrifice for their race so that they won't go extinct. It doesn't matter whether they know it or not. it doesn't matter because whether they know about it or not they will still do it because in the end to the devils the humans are nothing but prey

Now then are you thinking that I decided to write this book to rally the human race against the devils?

The answer to that is...

No

The reason I came to know about this impending crisis to humanity is because someone I care about got turned into a devil and I got interested in the devils and they're society. What I wrote here is nothing but a theory I have no proof for it. You can think of it as a writing of a mad person or simply a delusion. I don't care.

Frankly speaking I have no intention of ever showing this book to someone and I also do not have intention of trying to divert this impending crisis of humanity. You may call me apathetic or coward or whatever.

It doesn't matter to me. And to you who's reading this

- I won't tell you to avert the crisis written in this book. The knowledge you gained for it is something only you can decide, frankly speaking? Do whatever you want from the things you gained from this book. I already consider it doing a big favor for humanity by writing this book after all. Since you read this this book is yours from here on out. Whether you burn this book or spread its in your decision. Well then this is the end of writing my rambling then

- Nai Kiseki

PSS. - You won't believe how shock I am to learn the angels decided to copy the Devil's Evil Piece System to create Thier Own system just like it...

The reason it is Harmful is basically the same as devils but. Did these guys really live for a millennia or more?

How come I can't see the knowledge they gather for living for so long?

Ugh... Screw it just thinking about it is giving me a headache...

I'm outta here

- Nai Kiseki

Authors note

This is supposed to be a theory but ended up being a half book half theory with authors signature in it is this really okay I wonder?

oh well who cares as long as I can explain what I think this should be ok

To those who want to use this or something don't bother sending this account of mine a PM because I rarely use it. Too lazy to log in.

If you wanna use it just leave a review and give me my credit in a shout out or make this theory a book in your fanfic with Nai Kiseki as the author

i have other theory and ideas well i'll post them if this become a success

well then see you when I see you!