Riser Phenex? DXD SI. Multicross?

Author: KAIOSHIN

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Serafall chuckled melodiously, as if revealing a secret.

"Well, dear Riser, you've already made a mark at the Rias party. Now, with these mutant pieces, you've become an even more interesting player on the great underworld chessboard. I think many will want to get to know you better, and some will want to test your strength. Are you ready for the game?" teased Serafall, with a mischievous smile.

Riser accepted the challenge with determination.

"I'm more than ready, Serafall. If the underworld wants a piece in this game, I'll give my best. After all, I am a Phenex, right?" replied Riser, puffing his chest with pride.

Serafall nodded, satisfied with the young Phenex's attitude. Riser began to leave the room. While Serafall patted Riser's head, she blushed a bit? (A/N: Serafall likes shotas? Jokes aside. But do you find it strange that she's 530 years old and has no romantic interest revealed? Unless it's her interest. Hmm. Maybe it's outrageous. Yuri-Yuri. Siscon. Incxxxx.)

After a while, Serafall let Riser find his father. After all, it would be very improper if it leaked that she was fondling a Shota.

Riser walked through the castle corridors, storing his evil pieces in one of the first spells he learned. Dimensional, yes. Creating his own subspace to store his things. This explains where Serafall gets her things. He could hardly believe he finally had them! It was like being born again.

"Hey, kid, did you get your pieces?" Razer asked as he saw his son approaching.

"Yes, dad. And guess what? I have 5 mutant pieces!" Riser replied with a smile from ear to ear.

"Wow, really? That's lucky! Let me see this."

Razer opened the box and whistled impressed. Five mutant pieces were quite unusual. The boy was loaded; he could sell them for good money. Although for the Phenex, money was kind of useless.

"Congratulations, son. Now just choose who will fill these pieces and assemble your group. Have you thought of anyone?"

Riser nodded, all convinced.

"I've already chosen my first two members. I want to reincarnate Tsunade into my nobility. Reincarnating her with a mutant piece should give her a boost and elevate her to a Low Satan level. Or let's say Maximum-low. She'll be weaker than her mother, but for my nobility, she'll be the strongest at the moment."

"Good idea. She'll be great in your nobility. And as for Tsunade, if you didn't do that, I would question many things, my son," agreed Razer, finally smiling at his son.

Staring at his father with a look.

Sigh

"Now that we're talking about this. And my mother? Have you two finished the fight?" Riser asked, now contemplating the situation his father found himself in. Riser couldn't help but feel sympathy for him; basically, all his children are stronger than him, not only that, his wife eclipses that. And technically, who really runs the Phenex household is his wife. But she basically retired from it and left it to her husband.

Probably to heal the wounded heart of his little brother. After all, he wasn't the strongest, not the heir. ["Now that I wonder, why the hell did my mother marry her little brother? Fetish, maybe?"] thought Riser, curious to know how his father got out of this situation.

Razer blushed, not looking at his son. Patting him on the head gently. He spoke softly.

"I gave her something she always wanted. Since my time when I was a little older than you. Riser, you'll understand later, I suppose," said Razer to his son before they teleported to their palace.

** 

(Phenex Palace - Riser Phenex's Room)

Several hours passed after Riser got his evil pieces, where Riser was at his desk. Where he wrote his notes about his Template, experiments, and now he was jotting down data about his Evil Pieces.

Riser was using his own creations, the structural analysis spell; he already used it for reading, after all, it was much faster for him to analyze everything using this spell. All he had to do was use it, and he would know everything about the creation of the book, as well as with the evil pieces.

** I really have to tip my hat to Ajuka, this intricate piece to turn a humanoid into a devil, as well as later, it seems, also made an angelic version. This shows that indeed, with that aberration of the Kankara formula, he can even obtain information and analyze a species.

I also used the structural analysis spell to analyze myself in each form I have: [Angel/Fallen Angel/Devil]. This also helped him notice the similarities and differences between each one. He put all the notes in his notebook and diary. (A/N: Later he will keep it with him. After something...)

The Devil Pieces, as well as the Brave Saint, are made of the crystal from the floating island of Agares. In my own analysis, the Agares island crystal has properties to provide and maintain race change. For the change to occur, you can't just change the target's body, you have to do it as well as their soul.

If you only change the person's body, their soul will be forcibly changed, which leads to corruption in their body. Basically creating the stray demons. Ajuka probably made the first failed tests through body change.

If you change the soul, the body will slowly change to accommodate the race transmutation, the piece itself is more to keep everything stabilized. The reason you have to stay close to the "king" is that demons are magical beings. As obvious, the servant receives the energy from his body, so there are two problems that can occur, of course.

First, if you remove the piece before the transformation is complete or the devil in question has enough power to sustain himself, he will die. Yes, he will die because he will be without demonic energy in his body, and without it, the devil dies.

Second, if you move away from your master or run away. It means that the individual still has the piece in his body, so the race change is still happening. Imagine that now the evil piece no longer receives demonic energy from the master, but the transformation still continues. So it starts literally cannibalizing the individual, all to keep him alive, turning him into a monster, basically this is the reason behind the stray devils. (A/N: This basically should explain why Kuroka didn't turn into a stray devil or die. She can literally cheat with Senjutsu and Youjutsu. Being a Nekomata.)

I finish writing and finally look in the room. The symbols for the first transmutation I will do. There are two pedestals, where one contains what will be analyzed. On the other side, there are crystals from the Agreas islands, all that would be needed was to clap their hands.

Yes, thanks to his Template, he had the door of truth; but he wouldn't stay in this room to execute it. Leaving for another room where there is a traced line that connects the two circles.

"Tsunade, create a video image of this room, so we can see what happens."

"Yes! Riser-Sama," Tsunade affirms, casting a small monitoring spell. Creating several magic cameras so he can watch.

Claps*

After clapping my hands on the ground, the line shines in a strong blue. After that, I inject my demonic energy.

Sparkles! *

After a while, I enter and open the doors and enter the room, where he finds a new set of evil pieces. I can feel a connection to it. Casting a small structural analysis spell.

A smile cuts across his lips. Now it's time to transmute his pieces into....

**

(Several weeks later)

I look at my "New" set of evil pieces. I could have taken the easy way out and simply accepted this, but I am not normal obviously. Of 5 evil pieces, I transmuted them all. Not only that, I made 15 mutant queen pieces. In case in the future, I don't want to be part of the ranking games anymore. Yes, I plan to give this energy boost to my girls, of course.