DxD: The Holy Knight!

"Although the juggernaut drive can enhance the host's strength repeatedly, you must remember that you can't use it right now."

"Activating the juggernaut drive means paying the price with your own life. Most of the red dragon emperors and white dragon emperors throughout history died because they overused it."

Yasuhiro spoke seriously. The unmodified version of the juggernaut drive was highly undesirable in his opinion.

It was, after all a mechanism that traded life for power.

Issei hadn't even reached the balance breaker yet, leaving him far from achieving this so called juggernaut drive.

Yasuhiro knew his brother very well. Just by looking at him, he could tell Issei had completely ignored everything he just said.

"Do you still remember what I said when you first awakened the boosted gear?"

"Extreme anger or facing death can draw out the dragon's power. While this method does not apply to the balance breaker, it does trigger the juggernaut drive."

"Intense emotions resonate with the red dragon sealed inside your sacred gear. This is exactly why the various factions view the red dragon emperor and the white dragon emperor as factors of instability."

Issei seemed to understand that the juggernaut drive was something he should never touch at least not anytime soon.

"If what you say is true, then that Vali merely mastered a power enhancement that can be used a limited number of times," Rias pointed out in confusion after listening to Yasuhiro's explanation.

Sona and the others frowned, feeling that the juggernaut drive was not nearly as formidable as they had imagined.

After all, if it came at the cost of user's life force, the number of times it could be used was limited.

"Are you devils really this narrow minded? I'm genuinely worried about the future of your clans," Kuroka mocked, glancing at the girls.

Before Sona and Rias could glare at her, a sharp snap echoed through the room as Yasuhiro snapped his fingers.

The mark branded on Kuroka's body emitted a light power that went straight to her throat.

It completely sealed her vocal cords, leaving her to moan without being able to form a single word.

"For now, let's ignore this troublesome neko."

Unable to speak, Kuroka kept writhing and rolling around on the sofa.

She pretended to look pitiful, hoping Yasuhiro would take pity and release the gag.

Even Koneko couldn't bear to watch Kuroka's embarrassing behavior.

She turned her head away, completely refusing to look at her shameful sibling.

Sona and the others watched as Kuroka's boobs swayed with her constant movements.

They were large enough to rival Rias and Akeno, forming a stark contrast with her petite sister.

The girls who were a little less endowed secretly compared their own figures to her impressive assets.

"If Vali were just like the previous white dragon emperors, he wouldn't be worth paying attention to."

"However, Vali has an absurdly large amount of demonic power. To put it clearly, his power reserves are so massive that he can use them as a substitute for his life force."

This meant that the juggernaut drive had zero fatal side effects for Vali.

Considering that previous emperors died from life force depletion, Vali's workaround made him a terrifying anomaly.

"How could he possibly have such powerful reserves? Even if a human spent their entire life training they could never achieve that level of power," Sona said in confusion.

"Could it be that he is a reincarnated devil or perhaps a devil hybrid?" Rias recalled a few rare cases in the underworld where pure blood devil and humans interbred.

There was a chance of birthing a hybrid child who inherited both the limitless potential of a human and the immense demonic power of a pure blood devil.

"Bingo! You guessed it. He is a hybrid and also a direct descendant of old Lucifer," Yasuhiro confirmed.

"Old Lucifer?!" Rias and Sona exclaimed in perfect unison.

"His full name is Vali Lucifer and he is the great grandson of the old maou Lucifer. By sheer chance, he was chosen by the divine dividing."

"Doesn't that just make him a remnant of the old maou faction?"

Rias's brother currently held the title of maou Lucifer. Now, a legitimate descendant of the old Lucifer, someone no one had ever heard of before had appeared.

Moreover, he was an exceptional person.

Rias and Sona exchanged a grave look.

They silently decided it was best to report this matter directly to their siblings, as this was far beyond their ability to handle.

With her vocal cords completely sealed, Kuroka could only watch helplessly as Yasuhiro casually omitted crucial context about Vali.

He made no mention of Vali being under the direct protection of grigori or his complete lack of interest in overthrowing the underworld's current regime nor his battle maniac preference for challenging the strong.

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