So, for the first time since I finished Primordial Song back in 2020, I have a new Nasuverse crossover idea. This one is a bit different. Admittedly, I couldn't write much more of it for various reasons, but I intend to revisit the basic idea at a later date. In any case, enjoy...

MATCH MADE IN PURGATORY

CHAPTER 1:

TAKEN

"WHERE IS SHE?!"

"GAH! Fuck, man, what's your problem? Why do you want to know so badly? She's not even your real daughter!"

"She is mine, in every way that matters! I don't care where she came from. Now, WHERE IS SHE?!"

"I ain't talking, I…ARRRRGGHHH!"

"We can do this the hard way or the easy way. Well, it would have been easy if you told me right away. But now, the only thing you have left is how many bones will remain intact after I'm done with you."

"Fuck you, I…GAAAARRRGGHH!"

"No thanks, you're not my type, especially after my girlfriend ditched me. Now…where is she?"

"…Atrum Galliasta! He bought her! A Magus! But she'll be long dead by now! You know what he does with the brats he buys? He melts them down for their mana. And Clock Tower will never help you find him."

"…You want to bet? Thank you for the information. Now, I'll just break one more bone. Specifically, your spine. You'll never be able to walk, go to the toilet, or even have a wank ever again. That's what you get for kidnapping my daughter."

"Wait, wait, wa-AARRGGHHHH!"

The memory of interrogating that vile piece of shit echoed in Harry Potter's mind even as he headed towards what he hoped was the hideout of Atrum Galliasta. True, he probably went overboard, but he didn't care. All he cared about now was rescuing his daughter, and hopefully, she, and the other victims of Atrum Galliasta, could be saved.

She was not his daughter by blood by any means. Indeed, given her parents, he had every reason not to adopt her when he stumbled across her during an early mission with the DMLE. And yet…seeing her in the Rowle family home, an innocent toddler…well, he was struck with a need to help her, to ensure history didn't repeat itself.

Of course, adopting her was problematic, to say the least. Friendships were tested, and a few were sundered for good. His burgeoning if troubled romance with Ginny certainly didn't last: she couldn't see beyond the parents of that girl.

Yet despite everything, he had a fairly happy relationship with his adopted daughter. She was a somewhat melancholy child at times, especially when she learned fairly early on that she had been adopted. He told her little, knowing she couldn't understand. All he said was that she was a relative of the Black family, which was true enough: her mother certainly came from that line, and her father…well, given the incestuous kudzu his mother's family line was, it could have had a few Black family members there too.

But then, the truth about his daughter was splashed all over the front pages of The Daily Prophet. Ginny had decided to tell all, and had deliberately chosen to have it done at the time of his adoptive daughter's tenth birthday. It had come after an acrimonious row. Oh, if only he had thought to use the Fidelius or maybe an Unbreakable Vow. Then he or, more to the point, his daughter wouldn't be in this mess.

He and his daughter had had a blazing row themselves, before she ran away from home. Soon afterwards, he tried searching for her, only to learn that she had disappeared. It was thanks to some applied leverage to Mundungus Fletcher that he learned of that human trafficker who snatched her off the streets, and the link to Clock Tower and the Magi.

Hence why he was here, in Japan, in a city called Fuyuki. He'd just witnessed Atrum Galliasta leaving what had to be his hideout, being driving a luxury car somewhere. He was tempted to try and capture him and interrogate him, but that could backfire. After all, the man was not only a half-decent Magus, but he was apparently a Master chosen for the Holy Grail War.

He only learned about the Magi after Voldemort's uprising was ended. The colder, more ruthless cousins of wizards, something he would've thought impossible, but given the acrimonious relations between wizards and Magi, he wasn't surprised to not know about them, at least in hindsight. While not all Magi were ruthless pragmatists, many of them were, or else just plain ruthless. Hermione could've told him the details at length, but he honestly couldn't care less. The most important thing about the Magi, as far as he was concerned, was that they didn't lift so much as a finger to try and hinder Voldemort. As far as they were concerned, he could wipe most of the wizards of Magical Britain out, and then, when he had overextended himself, they would deal with him, leaving the wizards of Magical Britain weakened and decimated.

That being said, after adopting his daughter, he changed his career so he could be with her more often, becoming a Cursebreaker for Gringotts. And it was in this capacity that he met another Magus, the young Waver Velvet, later Lord El-Melloi II. Waver, at least, had some morals, and the two got along during an incident at an archaeological dig they were dealing with. Harry would later introduce Waver to Hermione, and the two hit it off, with Hermione being on the rebound from Ron, who later shacked up with Luna.

It was thanks in part to Waver, as well as the Wizard Marshall, Kischur Zelretch Schweinorg, that Harry had learned that Atrum Galliasta had been chosen to participate in the Holy Grail War, a magical tournament held in Japan. The Holy Grail was not the Biblical artifact, but rather, a powerful magical engine created by a triptych of Magi families, the German von Einzberns, the Russian Makiris, and the Japanese Tohsakas. The Grail, when fully primed, would grant any wish to the winners of the competition.

But there was a catch. In order to power the Grail, it would have to summon the spirits of heroes from myth and history, and when six of the seven spirits, dubbed 'Servants', were slain, the Grail would grant any wish, supposedly. Waver claimed to have fought by the side of Iskandar, better known as Alexander the Great, and had encountered King Arthur, who was apparently a woman. The Holy Grail War had been a traumatic experience for Waver, and he warned Harry to get his daughter and leave Fuyuki as soon as possible.

Atrum had apparently intended to summon a Servant once he reached Japan and ensconced himself in Fuyuki. His base of operations was a warehouse that he had retrofitted into a luxurious manor, with an alchemy laboratory in the basement. His family magecraft used a special curse to melt down living beings and condense them into mana crystals. He could only hope that his daughter hadn't fallen victim to that yet.

With that in mind, he hurried to Atrum's hideout, hoping that the man had taken his Servant with him. But when he finally got there, he was bemused to find people in basic shifts rushing around, coming out of the hideout. He halted one. "Hey, I'm looking for someone. Have you seen a ten-year-old girl? Silver hair, with a blue fringe?"

The teenager he was speaking to looked up at him fearfully, before she pointed back to the building. "Back there…she's with the witch…the one who slaughtered the people keeping us prisoner in the basement of that place. The witch told us to leave. But the girl wanted to stay."

"Thanks."

"Wait, are you her father?" the girl asked.

"Why?"

"…She's been waiting for you to come save her. You'd better not disappoint her," the teenager said, before running off.

Harry ran himself, heading towards the hideout. If Atrum's little stockpile of human sacrifices were fleeing, then it was a moot point trying to break down the defences. Instead, he headed for the elevator, and took it down into the basement, readying his wand. Whoever this witch was, he hoped she was friendly. Freeing the prisoners was a good sign, but that could mean little. And was that a Caster Servant? It didn't do to assume, just in case.

Of course, on the way down, he groaned at the muzak. Classical music, which under normal circumstances would be a better alternative to other muzak. But he felt this was more of a show of Atrum's pomposity and arrogance and pretension to culture, when in reality, he was the Magus equivalent of nouveau riche.

The elevator doors opened with a merry little ding, and he witnessed Hell beyond them. He was expecting Hell, of course, the kind that was basically an alchemic laboratory based on human sacrifices. He got that, but on fire, blue flames eating into surprisingly modern-looking equipment, and at corpses of Homunculi.

But where was his daughter? Or the witch? "Delphi!" he called out. "Delphi! Where are you?"

From behind some rubble, the silver-and-blue-haired girl poked her head out. "Dad!" she yelled, before coughing. And that was a good sign. She called him Dad again. There was no anger or hatred or wariness, just relief, relief he too felt.

She rushed over to him, and they embraced each other. "…Are you all right?"

"I'm fine, Dad."

"Then we'd better get going. That Magus who kidnapped you isn't going to be gone long, and he'll have his Servant back with him," Harry said urgently.

"Actually, you have little to worry about on that score. My so-called Master left me behind here," purred a sultry voice that seemed to echo around them. Harry stilled, even as he saw, behind Delphi, a hooded and robed figure materialise behind her.

As Harry raised his wand at what had to be a Servant, Delphi yelled, "Dad, no! She saved me! She saved all of us!"

Harry looked down at his daughter, and then at the Servant, who was watching him. It appeared to be a woman, dressed in black and dark purple robes, the hood up over her face, obscuring her eyes in shadow. All he could see of her face was a nose and blue lips, with lavender hair spilling out.

"You saved her?" Harry asked. "Why?"

"Because my Master is a fool. I will admit, I…have done many appalling things in my life. But what he did, for a pittance of mana, was obscene to say the least. And when I showed him I could harvest more mana from the very air itself…he took it as an affront to his pride. If you wish to leave with your daughter, I will not stop you. She seemed confident that you would come, and I had thought her a damned fool." A faint smile touched her lips, wistful and gentle. "I am glad to have been proven wrong, Harry Potter. My quarrel is with neither of you."

Harry frowned. What little he knew of the Holy Grail War seemed to indicate that what she did was impossible. Masters had some sort of magical tattoo on their hand, a Command Seal, that allowed them to command their Servants. "And what of Atrum's Command Seals?"

The Servant fished out a dagger from her robes, one that seemed jagged and sinister. "My Noble Phantasm allows me to reduce magical bonds and items to their components," she explained. "My Master ordered me not to use it on him. As he had offended me by his actions and attitude and his sheer stupidity, I used it on myself, to sever my link to him."

"…I only know so much about Servants, but that means you can't sustain your existence with his mana, right?" Harry asked.

"I will last long enough to give him an ultimatum. Do things my way, or he will die. Of course, I doubt his pride will allow him to capitulate to me, despite the fact that I have a most excellent strategy to win the Holy Grail War. So if he does so, then I will have gone out doing something good in this life, at least," she said. "I would suggest leaving with Delphini. She is too young to witness what I intend to put my Master through."

"No," Delphi said firmly. "He was going to melt me down for mana. I…I need to see it happen, to see that he won't hurt anyone ever again."

"Delphi…" Harry hissed.

The Servant looked to the elevator, and Harry looked to it as well. "…It seems a moot point. I think he has come back. Hide yourself for now, and I will deal with him."

Harry decided to agree for now, and pulled Delphi behind some rubble, using Bubble-Head Charms to stop the smoke from affecting them if it got too dense. The Servant merely stood, waiting patiently. And then, Atrum Galliasta came out of the elevator, swaggering, until the blonde-haired, tan-skinned man saw the inferno.

What followed was a brief argument. Despite the Servant's earlier words, her offer was surprisingly reasonable, spoken politely and without any contempt, even though he felt the Servant was barely holding it back. Atrum, after she had finished, had promptly tried to use his Command Seals to force her to commit suicide. He'd called her Caster, which Harry guessed was her class. She merely tilted her head quizzically, prompting him to use a second Command Seal to enforce it, meaning he had used up all three.

Harry decided to intervene then and there. "Surprise," he said, aiming his wand at Atrum as he emerged.

"Harry Potter?" Atrum demanded. "Did you do something to my Servant?"

"She used her own Noble Phantasm on herself, you overbleached moron," Harry retorted. "I came here too late to do anything…though thankfully, she saved my daughter."

Atrum sneered. "You mean Voldemort's daughter! You dare judge me, when you've taken on that monstrous little brat? She's only good for being rendered down for her mana. The Boy Who Lived…siding with this witch! I guess you two make a perversely apt pair."

"I think that's enough," Caster said, before waving a hand. Atrum froze, before sagging to his knees, eyes wide in fear and shock, mumbling to himself, even as azure flames began to consume him. "I trapped him within a labyrinth of his own mind, but he can feel the flames as they burn him. He's already dead, he just hasn't stopped breathing yet."

The elevator had gone back up, and Harry frowned. "Are you expecting anyone else?"

"No…" She sagged, panting heavily. "Ugh…listen, you'd best get out of here. I've used up a lot of mana after I freed myself from my ex-Master. And I think I sense another Servant. You may be magic users, but some Magi would silence you regardless."

Harry was torn, as this woman had actually saved Delphi and those other people. But he wasn't sure if he could trust her. Delphi, however, had no such qualms, running over to Caster and grabbing her hand. "Dad, Apparate us out of here!"

Harry, after a moment's hesitation, hurried over, grabbing onto Delphi's hand, and then Caster's. The elevator door opened with another merry ding, revealing a man in a figure-hugging blue suit, wielding a red spear. Blue hair was pulled back in a ponytail, and his eyes were crimson. "Oh, what's this?" he asked, his voice having a faint Irish lilt.

"Sorry, must dash!" Harry said, before Apparating out…

…And returning to his hotel room. Delphi swayed, while Caster simply collapsed, thankfully onto a nearby lounge. "Ugh…Apparition…how inelegant," Caster groaned.

Harry, after a moment, fished out a potion for restoring mana reserves. "Here," he said, handing it to Caster.

She looked at him from beneath her hood, before knocking it back, grimacing at the taste. But she looked less exhausted. "Ahhh…while your potion was not exactly tasty, it did the trick. It has bought me some time at least. Thank you."

"Look, you saved those people, and you helped Delphi," Harry said. "It's the least I can do."

"You also saved me from what I am sure was the Lancer Servant of this Grail War," Caster said, getting gingerly to her feet. "If we are speaking of debts, I am yet to fully pay mine."

"And how are you going to pay that debt?" Harry asked.

"…Perhaps by incurring another, but one that will pay dividends." After a moment, the Caster raised her hands, gently pulling down her hood. Harry wasn't sure what he was expecting under the hood, but he certainly wasn't quite expecting what he beheld.

Despite how sinister she looked with the hood up, her face was gentle and mournful, an elegant beauty marred by sorrow. Her hair was lavender, her eyes a sky blue. Oddly enough, her ears were pointed, giving her the air of an elf from the pages of Tolkien.

"I ask of you, Harry Potter…become my Master, and help me win the Holy Grail War, together…"

CHAPTER 1 ANNOTATIONS:

So, Harry's adopted Delphi, and after an argument, she got abducted, and he's basically emulated Taken…only for Medea to have rescued her. But will this work out at all?

No numbered annotations this time.