Sovereign of the Moon

by Dragon Of The Ecplising Moon

Hakuno Kishinami had faced many threats, from the Buddha to the Umbral Star. However, now she must face wield the full authority of the Moon Cell to save a almost dead world. However forces in the background seek the Moon Cell's power for themselfs, along side a returning threat. OP!Hakuno! OP!Servants! Moon Cell is OP! Umbral Star is also OP! Altera deserves headpats!

1. Chapter 1

Greetings! I have come to bring you a new fic, but first I must warn you of a few things.

There will be some AU elements to both Fate and Worm, mainly trying to get all the Fate/Extra Games to work into one timeline, which resulted in a lot of changes. Worm will be less AU but things will change a lot from canon thanks to our favourite Moon Sovereign.

Second, the servants are going to be OP! Like they won't be able to win every fight, but their defiantly one of the highest powers here, specifically the king of Heroes, for all others are mongrels before his supreme power.

Also Hakuno will be way more dangerous than in canon, like she has the Moon Cell itself to learn abilities from, and you expect me to believe she only knows a few code casts? Nah she's going to show off how she is the best protagonist.

The Shards will be dangerous of course, but Moon Cell is stronger than most of them in this story. Doesn't mean it will start hacking Shards left and right of course.

But the main thing about this fic, the Umbral Star. I will be taking some liberties thanks to how little knowledge we have on it, so you can consider that AU as well.

Now ANOTHER thing to talk about what, what servants will Hakuno have access to? Since the Moon Cell can observe basically any timeline, Hakuno can gain any servant. However she's not going to just have every servant show up, there will be specific servants who show up the most with others showing up every now and again.

Who are the servants? Well I'll leave that to your imagination.

Finally… relationships. I will say this, there is a harem. We all know Hakuno is the greatest harem Protagonist, besides Nero and Tamamo though, I won't reveal the rest of the harem, although you can probably guess.

Now I've talked about most of this stuff, I think it's time we begin the story don't you?

Hakuno Kishinami was not your average girl, she wasn't beautiful nor was she incredibly smart (at least, that's what she thought). In fact, everything around her seemed average. Besides the fact she wasn't human at all, Hakuno was a program of the Moon Cell, an unfathomably advanced super computer inside the moon.

She was also the Sovereign of the Moon Cell, a title rewarded to her after the winning the Holy Grail War, a contest in which magus competed with summoned Heroic Spirits, those who has committed legendary deeds and left their mark on history.

Hakuno had summoned the roman emperor, Nero, a Saber class Servant. Together with Nero Hakuno had challenged many servants and their masters, including the Buddha himself. She also met Tamamo-no-Mae, a Caster class, Tamamo had fallen in love with Hakuno and entered a contract with her. Together the 3 of them survived the Holy Grail War, until a bug in the system occurred.

BB, an advanced AI of the Moon Cell, trapped everyone on the far side of the moon. She had gone rogue thanks to the actions of Kiara Sessyoin, who desired to become a goddess. Hakuno could not find Tamamo or Nero, however a new servant made a contract with her, Emiya, an Archer class. However at times Hakuno would find her memory strange, almost as if another servant was replacing Emiya, a golden king. However this was likely just a glitch from BB's tempering with the Moon Cell.

Eventually, BB created 3 sisters from her own ego. These 3 were Passionlip, Meltryllis, and Kingprotea. Each was a terrifying threat, but Hakuno managed to conquer them 1 after another, eventually meeting up and reuniting with Nero and Tamamo. With all 3 of her servants together, Hakuno managed to defeat BB, even when she had gained the power of the Moon Cell.

However, the true antagonist revealed herself at last, Kiara. Kiara had absorbed Passionlip, Meltryllis, Kingprotea, BB and even the origin of BB, Sakura. She had become a true goddess, and crushed the team of Hakuno and her servants.

Falling into the abyss of the far side, Hakuno managed to awaken the origin of her Servants, boosting their power incredibly. With her servants stronger than ever, Hakuno challenge Kiara again, and against all odds over-came the goddess.

With Kiara defeated and BB along with her Alter-Ego's disappearing to who knows where, Hakuno was rewarded with the Regalia. The Regalia was the royal authority of the Moon Cell, granting its user the power of the Moon Cell. Using this authority, Hakuno and her Servants edited the Moon Cell as a place for life, with many servants without masters manifesting and AI attaining true free will.

However a new threat emerged, the Umbral Star and the Titaness Altera. The Umbral Star could be considered the sibling of the Moon Cell, but instead of gathering data, it destroys planets in order to harvest them. Titan Altera was a world destroying force trapped inside the Moon, who managed to project a version of herself onto Earth, the White Titan.

The White Titan almost destroyed the world 1000's of years ago, but was defeated by the Holy Sword, Excalibur. Archimedes, once an ally to humanity, was corrupted by the Umbral Star into destroying the Moon Cell. Tricking Hakuno into entering the prison of Titan Altera, who was almost destroyed by the titaness, however using the Regalia, Hakuno split herself and the Regalia into 3 pieces. The Body of Hakuno stayed with Titan Altera, who used it as her master in order to manifest a smaller body to fight.

The Mind of Hakuno went to Nero and Tamamo, who fought off an opposing team of Servants in order to try and regain the Soul of Hakuno, who had ended up in the hands of the missing BB. BB desiring Hakuno for herself, fought the Servant Duo, however this fighting was eventually interrupted by Altera, who almost killed them all.

Forced to team together in order to face the overwhelming power of Altera, the Mind and Soul of Hakuno were fused back together, missing only the body. Eventually they marched to the Zero Dark in order to face Altera at the heart of her forces.

The battle was long and devastating, 30% of the Moon Cell destroyed. Altera was defeated however, but her master, the body of Hakuno, stood in the way of the opposing forces. Unable to harm a version of their beloved master and seeing Altera in a new light thanks to previous interactions with her, Altera was spared and the Body of Hakuno was fused with the already mixed Mind and Soul, finally putting Hakuno back together.

Archimedes however had one last trump card, he transformed Titan Altera into Velber 02, Sephyr. Sephyr rampaged and destroyed almost all of the Moon Cell, forcing everyone to retreat together. With the Moon Cell nearing absolute destruction and Altera starting to fade away because of her connection to her titan self being cut, it seemed the end was upon them.

However BB revealed there was a way to defeat Sephyr, Moon Crux Origin. An upgrade to the Moon Crux transformation, which occurred by using the Regalia upon a Servant. Moon Crux Origin however, occurred by using the Regalia and bringing out the Origin of a Servant, this transformation was extremely powerful and allowed them to finally defeat Sephyr.

With his greatest trump card gone, Archimedes fell completely into despair, leaving him vulnerable to the Ark of the Stars, the ship which Titan Altera had stayed inside. The Ark consumed Archimedes in order to power its own systems, turning into a weapon of destruction that may have been equal to even Sephyr.

With their energy depleted, the servants and Hakuno could do nothing to defend themselves against the Ark. But Altera, who had bonded deeply with Hakuno, used the last of her energy to deal a devastating blow to the Ark. Inspired by Altera's sacrifice, Nero picked up her sword, Photon Ray, and called upon its connected to the Roman Gods, calling the power of Venus into her body, becoming Saber Venus.

Nero in her new Saber Venus form fought and destroyed the Ark, finally ridding the world of this piece of the Umbral Star. Using energy from both Nero's Saber Venus form, and the Ark, Tamamo managed to re-create Altera a body, but this body was that of a child, and many of Altera's memories had been damaged.

With peace restored and Altera saved, the Moon Cell was finally at peace for a few months. However eventually another threat did emerge, Karl der GroBe. But with new enemies, came new allies, the French King Charlemagne. Karl and Charlie were both apart of the same origin, but split into 2 halves, fantasy and reality.

Karl had created a spell called Orcaliziation, a form of brainwashing that kept the personality and beliefs intact, but bound the victims under Karl's will. He wished to unite the world, and wanted to conquer the Moon Cell to achieve this.

However during the fights against Karl, it was revealed that he had past interactions with the White Titans corpse, which granted him visions. Karl truly wished for peace, but went about it the wrong way. Eventually in a final battle, Karl used his Noble Phantasm to battle against the servants against him, but was defeated. Both Charlemagne and Karl started fading away, neither able to exist without the other.

Grieving over the loss of both, Hakuno and Altera managed to figure out a way to bring both Charlie and Karl back, with their own separate spirit origins. At last, peace had truly been restored to the Moon Cell.

But, while Hakuno had managed to save her own world, there was another deeply in need of help. And just because they had destroyed one piece of the Umbral Star, hasn't erased its origin… and of course, no matter how small, the destruction of one piece, would grab the attention of its whole.

So what do you think? I had lots of trouble trying to get the timeline working together. Some sections of the games were changed big time, while other parts were kept mostly the same. Honestly the conflict between Nero and Tamamo felt just a bit forced, if they really were both Hakuno's servants, do you think Hakuno would be okay with ETHER betraying the other?

This ended up with me changing the fate of BB, who originally I planned to have her just be reconstructed by the Moon Cell. Kingprotea wasn't being included originally, but I recently got her in FGO and I really, really couldn't resist adding my favourite giant. Let's be honest though, Kingprotea vs the End Bringers? That will be a fight for the ages.

I also buffed Velber 02, or as I prefer calling her Sephyr. Because let's be honest, if she really was such a threat that the world required unsealed Excalibur to defeat her, do you think even with Moon Crux, Tamamo or Nero could defeat her? I just ended up making a new form which was basically a fusion of Mono Crux and the Mythological Mystic Codes. Will this form show up again? Possibly.

Karl was… hard to work with, so his story is basically just the same. I didn't really see any reason to change it ether. It was mainly just he's got more servants working for him now.

Many of the things that happened haven't been covered, mainly because this chapter would be over 10,000 words long if I listed everything that was changed. May have some flash backs in later chapters though.

I hope these changes don't put you off this story, I am going to be keeping everyone in character as possible, but some things may be slightly changed.

I also decided to list each "faction" that existed during the Extella and Link part. Since some new servants did end up showing up because let's be honest, only reason there was only 4 servants per faction was because they're limited by how many they could make. Also some factions needed more members since I merged Nero and Tamamo's already existing factions.

Nero/Tamamo Faction – Emiya, Gawain, Cu Chulainn, Li Shuwen, Karna, Elizabeth Bathory, Lu Bu, and Medusa.

BB Faction – Passionlip, Meltryllis, and Kingprotea.

Altera Faction – Iskander, Jeanne d'Arc, Arjuna, Morgan le Fay, Heracles, and Edmond Dantes.

Karl Faction – Artoria, Atalanta, Lancelot (Berserker), Darius III, Vlad III, Scathath, Ushiwakamaru, Gilles de Rais (Caster), Dobrynya Nikitich, and Astolfo.

If you're wondering how BB's faction was able to face Nero/Tamamo's faction, BB is a super advanced AI and could probably make billions of attack programs, and each of her Alter-Ego's are absolute monsters, with Kingprotea who could probably defeat every faction by herself if given enough time.

Coming up with fighters for Altera's faction was a bit difficult, since I had to find people who'd fight with her, and were power houses. Arjuna is pretty obvious why he joined, Morgan is being kept a mystery, Heracles is a berserker with most of his sanity gone, and Edmond? Well I'll leave that up for your imagination to decide. As for which of them survived… you'll discover later.

Karl's faction was pretty easy actually, just a bunch of skilled or powerful servants since his oraclization would make them obey him anyway.

Although some of you may have noticed a certain King missing from any faction… let's just say I have PLANS for Gilgamesh, the one true king must protect his mongrel of course.

This chapter will end for now, next one we'll truly be getting into the action.