DISCLAIMER: I do not own Fate Stay Night or its other varieties, and I do not own Campione. They are owned by their respective authors/ publisher. This is purely a fanwork for the enjoyment of fans.

Final version 20 December 2016

Beta: SunnydoG

Chapter 0 : Prologue

Illyasviel von Einzbern looked at the abomination in front of her. It was the tainted Holy Grail, hosting the evil Servant Angra Mainyu, waiting to be born into the world. It must be destroyed, or the world would be the one destroyed.

Illya considered her options. All eight Servants, including that annoying bastard Gilgamesh had died. And they were stored inside her which made her body almost break down. So she cannot ask any Servants to destroy Holy Grail.

The other Masters... Onii-chan was still unconscious, laying in coma at Fuyuki Hospital. Rin had just finished saving her sister Sakura by stabbing her with Rule Breaker a while ago. Illya told her to go and carry Sakura outside the cave. Their condition, exhausted of prana, would not help her. She took the Jewel Sword from Rin though, she needed it more than the Tohsaka magus.

Master of Caster already died several days ago. Master of True Assassin, Zouken Matou, also died, though the manner of death was unclear to Illya.

Kotomone Kirei just died, killed by Illya after a tiring battle. That person was inhuman. Illya didn't want to do it again, her victory depended too much on luck and Kotomine underestimating her. But with him dead and the other Masters incapable, she was the only one that can do something about the Holy Grail.

Honestly, Illya did not imagine that this was how the War would turn out. At first, she wanted to do it just like her family ordered: kill Shirou, kill every other Master and win the Holy Grail, and die as Lesser Grail.

The first deviation came from getting bored on the airplane and watching a movie. The movie was about a secret agent / spy. She was hooked. She fantasized about doing this infiltration thingy and realize, hey she was actually going to a Real War anyway. Why not doing it like a secret agent?

And so Illya boldly went to Emiya House, proudly declaring herself as Kiritsugu's daughter, making her Shirou's adoptive sister, and successfully infiltrated the enemy base. The self-appointed guardian, Taiga, was charmed by her cuteness. The junior girl Sakura accepted her without much resistance. And her 'brother', Shirou, was too naive and accepted her without any suspicion.

She planned to pretend, as an ignorant child, as a good and sweet sister, not knowing about Holy Grail War or magic. Striking at her enemy when he was the least suspicious. But it didn't go her way.

Her new brother was sweet, caring, and good at cooking. She had second thoughts about killing him, if it meant not eating his food again.

From questioning Shirou, Illya knew that Kiritsugu had poor health and often traveled overseas. A little sneaking and rummaging through his things revealed that he traveled to Germany, close to Einzbern Castle. So, Old man Acht lied. Kiritsugu did come for Illya, but he couldn't get through the castle's protection.

When she felt lost and betrayed (for the second time) and not thinking about killing her new onii-chan anymore, The War began.

A Blue Servant crashed into the house and tried to kill Shirou. Of course Illya can't have that, so she set Berserkerl oose upon him. In the middle of chaos onii-chan summoned Saber, and then Rin came with Archer.

It was four way chaotic battle. Fortunately Illya can repair the house with magic.

She had to explain to Shirou and lied that she come to protect him. He trusted her without any question. Illya felt guilty about that.

The rest of the events were a blur. Illya had trouble remembering the exact order of what happened.

Saber - Berserker alliance stormed Ryuudou Temple to confront Caster.

Archer was onii-chan from the future that wanted to kill present onii-chan.

Shinji activating bloodfort andromeda. Shinji died.

Sakura became the second lesser grail and produced shadow.

Zouken Matou entered the fray and summoned True Assassin.

Shirou gave Avalon to Illya to help her maintain her human function.

Caster used Rulebreaker on Saber, and when Caster died, Illya formed a new contract with Saber.

Gilgamesh and Archer showdown in the Reality Marble Unlimited Blade Works (seriously that was awesome)

Illya ransacked the Tohsaka manor and opened a chest. A pink wand with star and wings flew out, spoke, and appointed her as its new master. Which was good because becoming a magical girl was something Kotomine never predicted. That was how she defeated him.

Shirou traced Caliburn.

Archer traced Jewel Sword and Rulebreaker for Rin.

Lancer was consumed by the shadow, and became Lancer with blackened bodysuit

Shirou was wounded and in comatose after killing two corrupted Servants.

The Holy Grail was tainted by Angra Mainyu.

Kotomine Kirei kidnapped Sakura.

Masters and Servants died right and left.

In the end, all Servants died and entered Illya as the Lesser Grail. She managed to maintain her human form because of Avalon, but it was getting harder to remember and think. Her body felt like jelly. Did she really swing that Kaleidostick a while ago?

Her fingers had no strength to maintain her grip on that stick. Oh. She remembered now. The stick slipped from her hand and stabbed Kotomine on the head. That is how she won the last fight.

She considered the facts again.

- Her last enemy is the Servant Angra Mainyu inside the Holy Grail. To destroy it, she needed something like Excaliblast.

- There were no other Master or Servants that can help.

- Her only weapons were Jewel Sword and Kaleidostick Ruby. Her clothes were that of a pink frilly magical girl costume.

It seemed impossible to do this...

But Illya had nothing to lose. Her life would end one way or another. She was not meant to survive anyway. Even if she live through this, she would die within a year. From the beginning, there was no happy ending for her.

"Aaah... I want to eat onii-chan's cooking one more time.." The white haired girl sighed. She had no regrets. At least before she die, she got to spend time with her onii-chan. Yes, the biggest derailment to Illya's original plan was that she fell in love with Shirou. At least she thought it was a romantic love and not sibling's love, if a half homunculus can feel love at all.

"I want to have a proper date..." It might be impossible to be onii-chan's girlfriend. There were too many competitors, and they were all pretty girls. However, she didn't ask much. Just spending time as his sister was enough. She wished that it can be longer, but alas, it was not meant to be.

Illya prayed that Shirou would be healed and wake up from his coma. His rate of recovery was not fast because he gave Avalon to her. She swore that she would destroy the Holy Grail to save her onii-chan.

With her death, she would save the world. Ironic, wasn't it? Her father wanted to be a Champion of Justice but failed. Her brother wanted to take up the dream but he was incapacitated now. Currently, Illya was the one attempting to save the world, just like a Champion of Justice. The daughter was the one who took up the duty, not the son.

Champion of Justice. It has a nice ring to it. Maybe it is worth to die for.

"Ruby!"

"Yes! Illya-san, what do you need?" The pink kaleidostick replied.

"I want to shoot the biggest, largest, most powerful magical blast to destroy that thing. Accumulate and charge the magical shot from the mana from other parallel worlds, get the prana through Jewel Sword"

"Illya-san, the blast will not be enough to destroy it,.."

"I know. Ruby, convert my nerves, lymph, blood vessels, and everything else that can be changed, into temporary magic circuits."

"But if you do that, your body! It will kill you Illya-san! "

"Ruby, please. I will die anyway. I don't have much time left. This is my last request." Illya spoke with difficulty. She already had trouble breathing.

"... alright Illya-san. I will do it. Together we will destroy that thing!"

Kaleidostick Ruby in Illya's hand began to charge prana. Illya held it in her right hand, while her left hand held the Jewel Sword.

"Ruby, when you shoot, I will put Jewel Sword on the line of fire. Blast it away." Illya planned to use the Jewel Sword as Broken Phantasm. She had seen Archer use this trick before. Her left hand began to overcharge the Jewel Sword.

With the Broken Phantasm and most of her body converted into magic circuit, maybe she can supply prana big enough to blast the Holy Grail away

Her body felt pain. Pain. Pain. Pain. Pain like her body burned in hellfire. Pain like thousands of needles stabbed into every inch of her body. Illya forced her legs to keep standing.

Her body was on the verge of breakdown to become Lesser Grail. Her nerves and organs became temporary magic circuits and produced prana. Her vision blurred. Her breathing became difficult.

SNAP

Something was broken. Her brain?

It was not important. She was in the middle of doing something

What? What is she doing?

She was drawing prana and pointing a pink stick forward.

SNAP

Why?

"Illya-san. ... almost finis... you hear me? Illya..."

A voice was saying something but she can't hear clearly. Who?

Not important. Her body automatically moved. An object in her left hand was raised, right in front of the pink stick she held in her right hand.

PAIN PAIN PAIN PAIN PAIN

She aimed the pink stick at her target. Her target was in front of her. It had a large head and gigantic two arms. It was black.

Eh? Something is different. The protection around it increased.

Not important. Illya can still feel Holy Grail and Avenger inside the black giant. Her target had not changed. She just needed to pump more prana.

More. More. More.

PAIN PAIN PAIN PAIN

"FIRE!"

A blast of magical energy blew away everything in its path.

=====break======

A while before.

Kaleidostick Ruby was charging a magic shot, and trying to make it as big as it can. Her master needed Ruby to do this right, and Ruby would not disappoint her master. It was master's last wish after all.

"Illya-san, I am almost finished charging. Illya-san, do you hear me?"

Maybe because the use of Jewel Sword by Rin before this. Maybe Illyasviel using it incorrectly. Maybe because the Servant inside Holy Grail wanted to escape and enacting True Magic. Maybe Ruby malfunctioned. Whatever the cause, there was a dimensional shift in Holy Grail proximity.

Suddenly, a black giant materialized with only his upper body. It then swallowed the Holy Grail.

"Illya-san! The Holy Grail is..." Ruby tried to warn Illya of this new situation.

But Illya's face was blank. She raised her left hand and placed the Jewel Sword in front of Ruby, charged to the brim with prana.

Illya pumped her last prana to Ruby and shoot.

"FIRE!"

A magical beam shot from Ruby, blasting everything in front of it. The whole upper mountain was swept away. Its power was even more powerful compared to Excalibur.

Ruby detected another dimensional shift after it shot the magical blast. It seemed that the blast shattered the fabric of reality, maybe because this place was already unstable from the shift before.

Everything became white. Illya's hand released its grip on Ruby.

Ruby was swept by shockwave. Its connection to Illya was interrupted because of distance.

A moment later, the contract between Illya and Ruby was terminated.

Ruby knew, usually in this kind of situation, the termination was caused by master's death.

===== BREAK =====

In another world, where Illyasviel became magical girl and collecting cards.

Illya and company just escaped after confronting the Eighth card

The Eighth card flew to Mount Enzo and went inside a cave.

It activated something there and became gigantic.

Illya and Miyu were hovering above it. They wanted to do something, but no idea came to mind. And suddenly, there was... something. Like a ripple, like a shift. And the black giant disappeared.

No trace. No nothing. No card. And the strange markings inside the cave were also gone.

They didn't know if it was a good thing or not.

===== break ======

A world of white. SHE hazily saw HER surroundings. SHE felt tired. SHE cannot move HER limbs.

SHE... what was HER name? SHE cannot remember.

No matter. Everything was finished. SHE was satisfied. SHE can rest now. But why did SHE still feel pain?

"You blasted that thing away from your world to this world. Amazing!"

Strange. Is this heaven? But SHE felt pain, so maybe this was hell. SHE had not been good in HER life, so SHE deserved it.

"I don't know if it is according to the rules. Is such thing allowed?"

Noisy. SHE just wanted to rest. SHE had saved the... world? What world? A suitable reward awaited HER. Eternal rest. So please let ME rest already, MY body is in pain pain pain.

"Is it even a god? Well... "

A girl with violet hair in twintails was peering at something. A lump of black mass.

"It has high divinity, lots of mana, and made by a collective belief of humanity. It has a strong ego like most of heretic gods, and it died here. It almost qualifies, you know. But it is only half-god. Eeeeeh, no, it is 70% god? "

The girl had pointed ears. She had a white dress, short body, and a flat chest. Hmmph Saber has more chest than her. Who is Saber?

"The other one is not divine. It is a fake god that represents all evil in the world. It carries an interesting vessel that has a lot of mana, but that is not enough. It won't do as sacrifice"

The black lump was actually two black lumps. Whatever. Just let me go already.

"But it is a waste if you died here after accomplishing such a feat. Can you do something? Oh my! What is this inside you?"

The girl reached inside HER and pulled something.

"This one is the same as the one you killed earlier. It has half divinity. Half plus half equals to one whole! Congratulations! The condition for sacrifice is met. Now I can reincarnate you."

This flat chested girl was still rambling on and on about things SHE didn't understand.

"Ara? It actually has 2/3 divinity. Multiply by two, and we got a surplus of 1/3 divinity."

"You have seven others inside! Do you want to sacrifice them? If they have divinity... Maybe, combined with Angra Mainyu and the vessel, you can get a bonus authority. Consider it a favor for my newest daughter."

That girl pointed to something. A blonde girl in blue clothes and armor. No! Not her. A memory of the blonde girl wiping HER mouth flashed and was gone.

"How about this one?" That girl pointed to something else. A red knight with white hair. No. SHE didn't want him to go. A feeling of sadness, regret, and other mixed feelings rose and disappeared.

"This one?" A blue warrior with red spear. SHE had no attachment to this one but it felt like she didn't want to pick it. Similar to a likable dog that was a bit naughty. You didn't throw that dog away.

"Hmmm. How about this one?" A woman with black-blue hooded robe. A feeling of dislike. She wanted her gone.

"Aha! First sacrifice. Oh it has divinity! Good choice. Next! How about this one?" A purple haired woman with blindfold. No. It was like... friend of a friend. Feeling of sympathy. Pity. Comrade in arms.

"Next one!" The girl pointed to a black shadow that had an arm longer than the other arm. It had skull mask. SHE felt dread, hate, fear, sick, fear, nausea, revulsion, iwantitgoneiwantitdissapear goawaygoaway goawaygoaway

"Second sacrifice! Ah not much. No divinity, just a soul and mana. Next!"

A samurai with very long japanese sword. SHE had no attachment to it. Whatever happen to it SHE didn't care.

"Oho this one is interesting. An imaginary hero? Next. Oh, last one, and it has a lot of divinity. If you sacrifice this one, you will assuredly get an authority."

A tall black giant, with stone skin and stone axe-sword. NO NO NO NO NO DON'T TAKE HIM NONONO NOT HIM NO NO NO.

"Are you sure? With only these, they cannot manifest into another authority you know. Even I, a goddess, can't do things without ingredients. "

NO NO NO NO NOT HIM NOT HIM

"Oh well if you insist. I wonder though. Why is it that your body has these souls... wow! Ah! Hmmmmm... I see. Yeah. Oh... my my my what an interesting body."

This small girl had melodious voice. SHE wondered if she was an angel of death picking her up. If so, she didn't do her job well.

"So that is why. You are a vessel. You are supposed to complement the other thing there. Hmmm. "

Her salary would be cut if I was her boss. Making the dead wait. Hurry up and let me meet papa and mama.

The girl hit her hand with her other knuckle. "I see! If I modify it like so, it is possible with your body! In fact, only you can do this! Hahahaha interesting , i haven't seen something like this for centuries"

Papa would be in hell. Mama would be in heaven. No matter where I went, I can meet one of them. What's their name again...

"Your new mother here will work hard for you. Now let's put this here. If I combine it with your body... "

The angel of death was saying something about how she was my new mama. I didn't want new mama. She was currently messing with my insides. I thought that I would not be operated in death? I had enough surgery operations while living, thank you

"Yes. It is done. Mama is happy for you, Illya-chan. You get a second authority!"

My brain felt hot. My body felt scorching hot. The previous pain was changing into different kind of pain

Illya... Illya... who? Illya... Illyasviel

I am Illyasviel

Illyasviel von Einzbern. My name.

"Bear the pain, my daughter. It is the price paid to bring you unto apex."

The violet haired girl wanted to speak more, but she saw something surprising and exclaimed:

"Eh? Eeeeh? What is that? That is not authority... Why does it manifest unto you? Oh well, as long as no harm for you, I guess it is okay."

SHE can move her mouth now. "Who... are... you?" SHE asked the girl.

"I am the witch who brought forth all disasters and a shred of hope. I am the mother of the Godslayers. I am Pandora."

The girl touched her cheek gently. "I declare this child to be my new daughter. Let everyone present grant their blessing and their hatred to this child. The seventh Campione - possessing the destiny of the youngest devil king, please bestow the sacred spell words upon this child!"

There were screams of rage, howling, inhuman shrieks. There was a woman wailing. But after that, there was one human speech saying "Very well, I the imaginary samurai, give my blessing to you, wonderchild. May you always be victorious."

Illya didn't know what to think. Her head still felt mushy and fuzzy. The pain had lessened though, and she can see, hear and speak. So she spoke. "You... are not mama. My mama has big breasts.."

Pandora froze.

...

...

...

After freezing for a minute, Pandora cried.

"Uwaaaaa ... hic. I worked hard for this child... hic... but she is an ungrateful child... hic. Making fun of my breasts...hic. Never... in thousand years...hic.. my stepchildren ever did that..."

Illya felt bad. Maybe it was not right to make fun of other's small breasts. "Alright, alright. I am sorry. But I already have a mama, so you can't be my new mama."

"I can be your stepmother. Hey, you can call me something else." Pandora stopped crying. Her eyes were still red though. "Oh, I will call you Honored Mother [Okaa-sama], alright?" Illya told her.

Pandora nodded happily. "Oh Illya-chan you are so cute! I never had a daughter as cute as you!" She hugged Illya and patted her head.

"Really?" Illya's head was still fuzzy and she didn't understand this adopting child business. She just let herself be hugged. Usually she was wary of strangers, but hey, she was supposed to be dead anyway. What was the worst that can happen?

"Yeah, usually my children are male, muscular, and old. The rough type. Sometimes there are pretty women but I never have young girls. Especially as young and cute like you!" Pandora rubbed her cheeks with Illya's.

Illya's head chose that moment to remember a small trivia. "But I am eighteen years old..."

Pandora froze the second time.

"LIES! That body... oh Homunculus... I see. But that means... Not only are you a loli campione, you are a legal loli! Legal Loli Campione!"

Pandora seemed to be worked up on something. No matter. Illya felt tired and she wanted to rest. The pain almost disappeared now.

"Ah it is almost time for me to go and for you to awaken. Good luck, my daughter. May you live an interesting life." Pandora kissed her forehead and turned away.

What was she talking about? I only had one year left to live. And with all the Servant souls inside me, I would not have long. An hour? Two hours?

"Hmmm?" Pandora came back and reached her hand inside Illya's stomach, pulling something. "This one is irregular. It cannot go with you in spirit form, so it needs to come out now. You will meet it when you awaken."

Illya wanted to ask more questions, but the world suddenly turned into blinding white.

AN:

1. This Illyasviel is from F/SN universe, from AU route that is similar to all 3 routes. It can be considered a hypothetical Illya route.

2. The timeline of Campioneverse is before Godou become Campione. That is why Illya become seventh and youngest. Godou will not become Campione in this story.

3. The black giant Illya killed is Gilgamesh card from Prisma Illya universe that suddenly transported to F/SN universe

Gilgamesh has 2/3 divinity. So, if there are two Gilgamesh soul, it is sufficient as sacrifice for godslayer rebirth ritual. Even a surplus.

The magical shot stranded Illya and Holy Grail and Gilgamesh Card to Campione Universe, and they died soon after. Ruby is blasted away and left in F/SN universe