First Step of System Conception!

Author: KAIOSHIN

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(During the Next Year Riser.) Riser – 8 years

As Riser continued his studies on diabolical and celestial energies, he began to realize the need for a customized system that could maximize his potential. Inspired by the principles of balance between darkness and light, he decided to create a Diabolic System that would be a formidable response to the Angelic System of the angels. (A/N: Imagine the demon mark from Nanatsu no Taizai. Yes, all devils will have the power of darkness. Against "Light" or sacred energy from heaven, and yes. Yes, the mark will grow as the user fights with it. And it will be instantaneous – all devils will gain this mark, like a Pseudo Omniscience. Its power will be explained later.)

Initially, Riser delved into research on forbidden diabolical artifacts and rituals. He discovered ancient texts describing the creation of magical systems capable of channeling and amplifying infernal energies. Based on this knowledge, he began to develop his own Diabolic System, an intricate network of symbols, enchantments, and connections with the energies of the underworld.

The creation process involved intense rituals and experimentation with his own physiology. Riser adjusted his Template System to incorporate the essential components of the Diabolic System, merging his natural abilities with ritualistic magic.

Riser's Diabolic System was designed to destabilize and counterbalance celestial energies. He incorporated specific diabolical runes with disruptive properties against sacred energy. Additionally, the system allowed Riser to manipulate diabolical energies in more refined and strategic ways.

Throughout this process, Riser faced considerable challenges, as the balance between opposing energies was delicate.

**

[Template*]

[Zeldris – Nanatsu no Taizai] (Kusanagi - Naruto)

[Sawada Tsunayoshi] [Rin Okumura - Ao no Exorcist]

[Models!]

[Natsu Dragneel – Fairy Tail – 100%]

[Paikuhan – Dragon Ball Z – 15%]

[Anthony Stark Marvel (Terra-199999) – 100%]

[Lúcifer MorningStar – 7.99%]

[Kratos | Deus da Guerra 3 - 75%]

(Model completed – 100%)

[Roy MustangFMAB; Batman – DC Comics Novos 52; Feitan Portor; Sabo; ACE – One Piece]

**

[Template*]

[Models!]

[Zeldris – Nanatsu no Taizai – 40%]

[Paikuhan – Dragon Ball Z – 20%]

[Sábio – Marvel– 85%]

[Lúcifer MorningStar – 8,15%]

[Kratos | Deus da Guerra 3 - 75%]

(Model completed – 100%)

[Roy MustangFMAB; Batman – DC Comics Novos 52 | Feitan Portor - HxH | Sabo – One Piece | ACE – One Piece | Natsu Dragneel – Fairy Tail | Anthony Stark Marvel (Terra-199999) |]

**

He did it; he finally finished his idea and conception. He created something that could change everything, at least the beginning. Of course, the idea of using the devil mark. Unfortunately, he wouldn't be able to give the seven hearts. But he was able to give darkness and the ability to regenerate.

Yes, the power created by the Devil King wasn't very creative. But this power could combat light and provide the ability to regenerate. The inherent weakness of devils would be severely weakened by this. Besides, it strengthened his power.

There's the fact that emotions would be intensified – more anger, more hatred, more negative feelings. Yes, it would be difficult to control, but a necessary evil. Of course, being a member of the Phenex clan, he made sure that this healing ability was not a regeneration like Wolverine's and that it would still require true healing tears from Phenex. (A/N: It could still reattach a cut-off arm, for example. But if someone loses the arm, it's gone.)

He wouldn't jeopardize his family's livelihood. Obviously, he did this with the greater good in mind.

**

(Sitri Mansion – Sona's room.)

Today would be the moment of the confrontation with her Rival, and so far, it was fifty victories to zero for him. But she definitely wouldn't give up.

Hmph.

Sona adjusted her glasses, with annoyance on her face as she moved to the entrance of the Sitri mansion. As she exited, lost in thoughts about Riser, Sona didn't notice her sister with a wide grin.

"So-chan, dreaming about Ris-chan?" Serafall teased, poking Sona's cheek.

Sona turned with her cheeks burning in shame and embarrassment, trying to gather all her strength to come up with a comeback. But nothing came out of her mouth as she saw her sister.

"One-sama?!" Sona questioned, seeing her sister dressed in an extremely short magical girl outfit, and not only that, she had a blush on her face? Gathering herself, Sona asked her sister.

"Why are you here, One-sama?" Sona was curious; after all, her sister was the Maou Leviathan in the underworld, she would normally be busy. She only stopped for her family. But today wouldn't be anything special. ("Not that Sona knows, of course. XD")

Serafall momentarily caught off guard, decided to use an old tactic. Deflect to something else or rather "The Diversion."

"Ah! My So-Chan is so cute! She looks so adorable when she blushes! Your glasses are lovely!" Serafall threw herself at her sister, rubbing her face against hers like a pervert. Sona, taken aback by Serafall's explosion, was frozen and blushing.

Until she couldn't take it anymore, she turned and walked faster. While her sister watched her with red ears.

Sona marched determinedly out of the house, with the mission of defeating Riser on her mind. She wouldn't let that arrogant guy win again, even if she had to stay up all night studying tactics!

But her thoughts were interrupted by an upbeat voice:

"So-chan! Where are you going with that serious look?" It was Serafall, her older sister. Sona blushed like a pepper when she saw the extremely short magical girl outfit she was wearing. Once again, Sona questioned:

"Onee-sama?! What are you doing here?"

"Well, I came to see my cute little sister!" Serafall squeezed Sona's cheeks. "Wow, you look so adorable all red like that!"

Sona deflected and rushed out, with ears hot with embarrassment. She had more urgent matters to attend to!

At the same time, she didn't notice that Riser was already in front of her with a gentle smile on his face, watching the two sisters' antics. Even for Riser, he could see that Sona loved her sister very much. He hoped or imagined that this could evolve into something more when Sona grew older if she weren't so serious and shy.

Bonk.

Sona bumped into him and fell, while at the same time, Serafall, who was following, also "bumped" into Riser. She did a somersault backward and fell, showing her panties. Riser, of course, noticed that Serafall did it on purpose.

"Urg."

"Sona-chan, Levia-tan, are you okay?" Sona mumbled some response. Then Serafall threw herself at Riser. And squeezed him in her magical girl assets.

(A/N: Sona lost again...)

(A/N: For the first world, I wanted to send the MC to the FGO route, but starting in the Fifth Holy Grail War. And I was also thinking about the characters he should pick. Just so you know, I want to make sure that in this timeline Shirou Emiya is dead, and the one Kiritsugu adopted was actually Miyu Emiya - Edelfelt... The MC will appear in the Holy Grail War, and from there it begins. Emiya Archer will be summoned, but he will be extremely happy. It doesn't even need to be said why... Well, as for the rest, I want to leave it as a surprise... except for the fact that I definitely want the sadistic Illyasviel von Einzbern* no matter what. The main reason is that she is literally a walking mana bomb, capable of containing the mana of Servants. It's simply absurd. Imagine her receiving a Mutant Piece. The only thing I see is her having the energy of a True Ancestor. Maybe even without the Grail, she could obtain the Third Magic.)