DxD: Transfer Student!

Rizevim, caught completely off guard, found himself slammed into the earth, creating a large crater upon impact.

Badr shook his head, a hint of annoyance in his voice. "Now I have to fix the yard again."

He glanced at Ophis. Ever since she'd moved in, trouble seemed to follow, and his house had suffered the consequences.

Rizevim pushed himself up, staring at Badr in disbelief.

"Impressive… That wasn't a Sacred Gear ability, was it?"

He grinned, a predatory gleam in his eyes. He seemed… excited.

Rias and the others, who had been worried, breathed a collective sigh of relief.

They knew of Rizevim. He was an Old Maou, his true name Rizevim Livan Lucifer, the son of the Original Lucifer and Lilith, the Mother of Devils.

As a Super Devil, his power was immense, a threat even Sirzechs took seriously. All of Sirzechs' servants were specifically chosen for their lack of Sacred Gears, a strategy designed to counter Rizevim's Sacred Gear Canceller.

Rias had been prepared to call for her brother's help, but Badr had handled the situation with surprising ease.

This was a true Transcendent Super Devil Being.

Rias and her peerage were stunned. Badr could now face a Super Devil on equal footing. It seemed impossible.

Rizevim, unfazed, launched another attack, a wave of demonic power so potent it nearly forced them to their knees.

Badr smiled faintly. "Your Sacred Gear Canceller only works on powers directed at you."

He activated [King Sword's] amplification, his own demonic power surging.

Rizevim's ability wasn't absolute, it seemed.

Channeling the [Power of Transcendence], Badr extended his Absolute Control, the world around him coming into sharp focus.

Within this domain of awareness, he was the master, his gaze fixed on Rizevim.

Rizevim felt a chill run down his spine, a premonition of… death.

Could he be killed by this boy?

Impossible!

But the primal instinct for survival screamed within him.

He instinctively tried to open a dimensional rift, to escape.

But Badr spoke a single word: "Seal."

A familiar power emanated from him, and Rias and the others realized, with a start, that he was using… the power of the Demon Sealing Stamp!

He hadn't summoned a familiar. He was using the ability himself!

And just like that, Rizevim's power was sealed.

This was something the Demon Sealing Stamp, on its own, couldn't have achieved. The difference in their power was too vast. Yet, somehow, Badr had done it.

"Transcendence… such overwhelming power…" Vali murmured, his voice laced with awe and a hint of fear.

Badr's strength was now beyond reason, his abilities seemingly Limitless, thanks to the [Power of Transcendence].

Rizevim, his power sealed, was engulfed by Badr's aura.

His expression froze…

And then, he was gone, reduced to ash, as if he'd never existed.

Vali and the others stared in stunned silence.

Completely and utterly annihilated...

Rizevim, a Super Devil Being, had been killed…

With Effortless Ease...

"Amazing…" Kuroka's eyes gleamed with admiration. This was the man she'd chosen. She'd believed in his potential, his destiny to become a powerful being. But she hadn't expected it to happen so soon.

This changed everything.

Rizevim had been the leader of the Khaos Brigade, a threat that even the Maou feared. And now, he was dead.

With Rizevim gone, there would be no one left to oppose the peace treaty between the Three Factions.

"Come on, Badr, let's go to the Underworld!" Rias, her voice filled with excitement, grabbed his hand, eager to share the news.

"Now?" Badr blinked, his tone casual, as if he hadn't just single-handedly eliminated one of the greatest threats to their world. "We have school tomorrow."

His nonchalant attitude left Rias speechless.

"This is a big deal!" she insisted. "And you deserve the recognition. I won't let you be overlooked."

Rias, her mind made up, pulled him towards the magic circle.

Badr, with a resigned sigh, followed.

<><><><>

....

In the Underworld

News of Rizevim's death reached Sirzechs. Even he was stunned into silence for a moment.

The news spread like wildfire, sending shockwaves through the Underworld.

"That boy… he killed a Super Devil Being?"

"He's… a monster… How are we supposed to compete with that?" The younger generation of devils lamented, feeling the weight of Badr's shadow looming over them.

Back at the Gremory castle, Rias turned to her brother, her voice firm. "Brother, about Badr's reward…"

"I haven't forgotten," Sirzechs replied, a wry smile on his face. "But this… this is beyond anything we could have anticipated. I'm not sure what we can offer him."

"It doesn't matter," Badr said with a shrug. Material possessions held little meaning for him now. With his newfound power, such things were easily acquired, transient and insignificant.

"Still, some things must be acknowledged. It seems we'll have to make another exception for you, Badr. Once everything is settled, we'll begin preparations for your coronation."

"Coronation?" Rias gasped.

"Me? But I'm not even an Ultimate-Class Devil yet…" Badr was speechless. His power had grown so rapidly, he'd only recently taken the Mid-Class Devil exam.

Sirzechs chuckled. "A valid point, but your current power… it qualifies you to become a Maou. And the Underworld needs your strength. It will… strengthen our position in the upcoming negotiations."

Rias's eyes lit up. "That's right! Badr, you should become the fifth Maou!"