Diablo in Highschool DxD

Chapter 21: Water and The Hassles That Come Alongside It

He stood in the center of the room, his gaze fixated on the opulent coffin. Every detail had been meticulously crafted, from the intricate carvings adorning its surface to the soft, azure lining within

If one looked closer, they could see a slight crack in the carefully arranged facade. The top lid had been raised, revealing a glimpse of darkness within, as if someone had opened it recently

With a pensive expression etched on his face, he finally turned away from the coffin, his footsteps echoing through the vast chamber. As he approached the double doors, he reached out and closed them, sealing off the room. With that he turned around and headed forward.

There were certain individuals. Certain individuals that immediately occupied Diablo's mind when he first arrived in this world. These individuals had their own particular situations revolving around them, but they had unrivalled potential, and were too useful to pass up. He had an idea of their basic situations and what would happen to them in the future, thus already having made up his mind. He would use this to his advantage. He had to have them.

Roygun was one of those, Lavinia and Kuroka too. Another of these individuals was a certain someone from the Leviathan House

Ingvild Leviathan

Born to the union of a Human and a Devil, her early years were spent peacefully in the Human World alongside her parents. However, fate dealt her a cruel hand when she succumbed to the Devil Sleeping Disease, a disease with no cure. The ailment robbed its victims of their consciousness, plunging them into a deep sleep from which they could not be awakened. As time wore on, their bodies withered, their life force gradually fading until it inevitably succumbed to the embrace of death. They could only be alive artificially.

In a desperate bid to preserve her life, her parents made the decision to relocate her to the main clan in the Underworld, where a select few nobles kept and hid her. Most of the clan didn't even know of her existence.

Anyway, what made Ingvild truly extraordinary extended beyond her inherent potential and the royal devil blood flowing through her veins, which bestowed upon her the formidable abilities of the Leviathan Clan. She held the destiny to awaken a Sacred Gear in the future.

An immensely powerful one, a High-Tier Longinus. Nereid Kyrie

It was a Sacred Gear that had the destructive potential to destroy the entire world.

Diablo was acutely aware of the potential consequences that would arise if the Leviathan House discovered Ingvild's absence. Although the likelihood of such a discovery was slim, he was prepared to confront any fallout that might ensue. The risks and possible ramifications paled in comparison to Ingvild's worth in his grand scheme. She was worth it

Now, speaking of her, he wasn't exactly sure how to wake her up and cure her Devil Sleeping Disease. In canon, the awakening of her Longinus acted as the catalyst for her revival. But, that was years away. If he and Rias were the same age, then Ingvild was the same as well. Plus a hundred years.

So if he's 11 right now, then that means she's 111 years old. So according to canon, she would wake up in the next six years.

He didn't have that much patience, though if there was no other option, he would ultimately reluctantly wait. But, he wanted to explore other ways. To wake up her earlier. That was what he was thinking about right now, brainstorming everything he knew about this world to find an answer.

In fact, he was heading to the library right now. He had to find a way...he needed to...

A boy sat upright on a luxurious king bed adorned with black satin sheets, engrossed in the book. His brows were furrowed in frustration. If one took a closer look, they would notice a towering stack of books piled beside him, an indicator of the long duration he had been doing this for.