Mob Devil's Guide To Surviving DxD

In the dimensional gap that lies between all things in the world, a small dimension, like a grain of dust, drifts alone in absolute silence.

Within this small dimension, a floating city.

No, it's more appropriate to call it a massive floating Fortress, than something like a mere city.

Erected at its center, a tower, which seems to have been built with no other purpose than to challenge the very authority of God by attempting to reach the heavens.

And currently in one of its top floor...

*BOOM*

A massive explosion.

My body was a ejected upwards out at speeds of over 150 kilometers per hour. But just before full crashing on the ground I managed to brace myself.

"ARGGGH!!"

The pain was only slightly bearable. but the fifteen-year-old boy managed to pull through it like a champ. This is obviously not the first time something like this has happened.

"Shit. Shit. Shit. Damn, I messed up in the calculations. "

What am i doing right now? What exactly is this situation? The answer is simple. Magic experimentation.

"Damn, good thing i stopped doing these experiments in the house. Mom would have f.u.c.k.i.n.g killed me if I tried this back there"

"sigh, going to have to rebuild the lab... again"

"Another failure. Damn, what wrong? is it really impossible to imitate the boosted gears doubling effect using demonic power?

[Well.. if anything, you developed a decent suicide bombing technique.]

"Of f.u.c.k off. You have no help either"

[What's this one? failure number 420? 440?

I stopped counting a while ago.]

"Attempt number 433. and besides, it's not really a failure. It's just the 433th method of incorrectness. Which basically reduces the amount of possible future failures by 433"

[I told you didn't I? It's better pull something out from the depths of your soul than to try to copy. Even if you managed to copy it, it's going to be a shoddy imitation of the original. The abilities of a true dragon comes from the depths of their own obsessions. it's something unique to them. Soo I'll say it again, give up this foolish attempt to copy, and come up with something truly yours that can match [boost] and [divide].]

*sigh*

"Yeah, you're right."

- Boost gear effect recreation experiment: number 433

- Results: explosive diarrhea.

"Damn... I'm tired today. I'm going home. "

I struggle to get up, looking at my bloody body, i activate a body restoration program.

--Pseudo magic circuit startup...

--Beginning restoration protocol...

--Analyzing affected area...

--Estimated damage degree.... YELLOW.. .

--Ruptured liver... Right lung penetrated...slight brain hemorrhage... ruptured eardrums.. shattered t.e.s.t.i.c.l.e.s...

--Damage degree re-evaluation...RED...

--[Avalon] starting up... restoration progress:15%....44%....78%...99%...

--Report... GREEN...

The devil is an unconscious shape sifter. Their body will change slowly to their idealized form. This comes in handy because when I was training, my muscle will grow stronger than a human could be with higher density. But muscle isn't the only things that grow. My whole body is slowly becoming more efficient, my bones being denser and stronger, my sensory perception becomes sharper, my demonic power grows bigger. 

This spell I named [Avalon] takes advantage of that. It uses the unconscious shape-shifting ability as a starting point, Then combined with various other effects, i created a restoration program that was only about 1/15th the speed of a phoenix regeneration.

And it's just slightly slower than using Phoenix Tears.

In other words, as long as I'm not killed instantly. I'm not going to die.

After healing myself, I got up and went about to restoring my surroundings, then returned back to the top up the tower to my laboratory which was currently in shambles.

The name of this floating Fortress City is Babel.

Thus, the tower in the center is the Tower of Babel.

Yes, that Tower of Babel.

The one from the biblical myth.

The only difference is that in this world, not only does the Tower of Babel exist, the civilization at that time was extremely advanced. Though they did not take the path of regular science, they took the path of magic and extremely advanced Alchemy.

Their civilization was on par with even Atlantis.

It's just that they got a little too big for their britches and dared to issue a challenge to the gods.

Something about Humanity being freed from the confines of the gods, even going as far as to try to build weapons the kill gods.

As one can expect, that didn't go so well.

The civilization was annihilated, and as a latch ditch effort to save their civilization, people of Babylon huddled in their final Fortress City and launched it along with the tower alone Into the depths the dimensional gap.

The reason that the tower was sent alone, was because like the original myth, a curse was placed upon the human race at that extremely crucial time that prevented them from understanding each other.

In fact, like devils and angels and other supernatural creatures, humans originally had the ability to understand all languages. but this ability was taken away from them by the Gods.

And as such, they could no longer operate the tower control systems. It's just that the automated ritual systems of the Tower had already activated and the the people at that time, who now could no longer even recognize their own magic languages, were killed in the transfer process because they were unable to activate their magic defenses.

So, for thousands of years, this city, this tower, drifted alone in the void with no one knowing its location.

Of course, with the exception of several high-level entities.

As a longtime residents of the dimensional gap, both Ophis and Great red know of its existence.

I was lucky enough to hear its location from Great red and took it upon myself to commandeer it.

luckily, the place seems to have run out of energy over the long years, otherwise I would not be able to enter, let alone leave, this dimensional fortress alive.

If not for that, I would have had to face weapons on par with even a longinus.

.....

With everything in order, I teleport instantly back home to my family's house in the underworld. There, I'm greeted by an unexpected visitor: "You're finally back, Young Master Linnaeus"

Standing at my exit zone was none other than maid of satan sirzechs. The strongest queen, satan yellow, my combat instructor -- Grayfia Lucifuge.

"Sensei? Why are you here? please don't tell me it's another one of those surprise training session"

"As much as I would just love that to be the case, it's not. I have a request for you from the gremory family"

A request from the Lords?

I focus as this seems to be a serious case. I collect all my thoughts and calculated all possibilities and I quickly came to a conclusion as to why she might be here.

it's time for the little missy to run away from home.

"The next heir of the clan has taken her peerage and seems to have run away from home to the human world."

My conclusion was correct.

"Of course, she's using the pretext that she wants to study in the human world. But we all know why she's going there."

"And my mission?" I replied.

"We want you to enroll into the academy with her to... keep an eye on her."

"We already know that you seem to have a home there, so it shouldn't be a big deal for you."

"First semester starts in six months, prepare yourself"

looks like the show's starting. only two - three more years before everything truly becomes chaotic.

These next 3 years, let's make my final preparations in this time.

"Oh, by the way. Congratulations on your promotion to high-class"

Saying that, she handed me a chessboard with 16 pieces.