A Nexus Devil (Dxd x Multi Crossover)

Underworld Interlude

Sirzechs Lucifer, formerly Gremory, the legendary strongest devil ever and inheritor of the Lucifer title, had recently received a message summoning him to visit his best buddy (and absolute shut-in), Ajuka, as soon as possible for "undisclosed reasons." Finally, he had a proper excuse to get away from his never-ending paperwork and his nagging (*cough* loving) wife.

Sirzechs teleported to Ajuka's lab, expecting to find his buddy bent over a microscope or immersed in programming his latest magical robot of doom. However, he was surprised to find that Ajuka wasn't alone in the room. One of their fellow Satans, Serafall Leviathan, was with him. She had bags under her eyes and clearly looked exhausted from overwork, much like Sirzechs himself.

"Hey there, Sera. I see you've been burning the candle at both ends with work as well," Sirzechs said wearily.

"Hmmf, you two have the easy jobs as fellow Satans. Meanwhile, I'm stuck with the difficult task of preventing other pantheons from attacking us every time some idiot devil decides to reincarnate someone they absolutely shouldn't touch into their peerages. A member of the Ball Clan just tried to sneak into the Island of the Amazons and kidnap some girls for his harem... I mean peerage. Needless to say, it didn't go well for him, as his head was promptly cut off. If you're going to attempt such foolishness, at least be a member of the Phoenix Clan, so you have a chance of survival. Unfortunately, he's dead, and frankly, we're probably better off without him in the Underworld," Serafall added with a sigh. "Thankfully, the Greek pantheon found it amusing overall and isn't pressing the issue. So, at least there's that," she said.

"It's times like this that I regret creating the Evil Piece system," Ajuka chimed in. "Honestly, if they weren't necessary for saving our race from imminent doom, I would activate the kill switch and deactivate all of them remotely."

"What?! There's a kill switch that turns off the Evil Pieces?" Serafall asked, surprised.

Ajuka snorted. "Haha, of course there's a kill switch. I plan for every scenario, especially if all the reincarnated Devils try to rise up and slaughter all the pure-bloods. Not that we wouldn't have it coming, mind you. But I'd rather it never happened in the first place. Hence, I have a kill switch that disables their access to magic," he explained. Sirzechs nodded in agreement. As a close friend of Ajuka, he was well aware of it. It was definitely something they would never disclose to the reincarnated Devils. Revealing its existence would only lead to their failed uprising and defeat the purpose of having a secret kill switch.

"Okay, moving on from the dark topic," Serafall interjected. "Why did you call both of us here and make it seem so urgent?"

Ajuka chuckled. "I'm glad you asked. It has to do with this." Ajuka threw a newspaper called The Daily Prophet between Serafall and Sirzechs, ensuring they could see the headline. It read, "Here are the three champions for the Triwizard Tournament." The article began with, "British citizens are angry that the champion for Hogwarts is surprisingly not British at all. He's actually an American transfer student named Jake Gremory. This is an absolute tragedy for Magical Britain..."

The article continued to slander the boy named Jake Gremory and Americans in general, portraying the situation as a tragedy for the country. Sirzechs thought to himself that the article was highly sensationalized. But what caught his attention was the mention of a certain Jake Gremory. He had never heard that name before.

"Who is Jake Gremory?" Serafall asked, voicing the same question that was on Sirzechs' mind.

"Who indeed," Ajuka replied, a playful tone in his voice. "I was wondering the same thing, so I sent one of my sneakier familiars into Hogwarts. And let me tell you, the security wards there are laughable, especially considering it's known as the safest place in Britain—spoiler, it's not. Anyway, I sent my familiars to grab some hair samples from Jake Gremory so I could run a DNA test. And congratulations, Sirzechs, he's your half-brother."