Hello guys, Opulent One here, and I have elected to rewrite the story without really changing the main plot… well sort of.

I didn't like the direction the original version was going, so I wanted to get things right this time now that I have an actual idea where I want things to go. The general plot points will remain, just more detail has been put in, and hopefully better writing.

Herald of the Sun's design is slightly altered, to match the unnamed (now named) worker better, which explains her smaller size compared to her normal version. (Base version of Pyra is 168cm and 61 kilograms, translate to imperial if you wish). I hope that this version proves to be better once I figure out how to delete the chapters ahead.

Without further ado, let us begin this story of a mysterious new servant!

Chapter 0: Welcome to Chaldea

(Chaldea, Fourth Test of the Summoning Circle)

It was a typical day at the Chaldea Security Organization, with routines going along as well as anyone would expect it would. Many people were working hard on making sure the FATE system was operational for another test. It has worked in the past, though was rendered unreliable for constant use. Data on the first successful summon was expunged by orders of the Director Animusphere. The second test was also kept under wraps, though a few people know the truth behind what happened in that one. The third test was successful in granting an ally in the form of a genius.

It was none other than Leonardo Da Vinci, famous inventor, and all around genius. He used his knowledge to make himself a woman for the hell of it. It is argued about what the true reasoning behind it is, but it is presumed to be along the lines of the Mona Lisa being the ideal beauty at the time., so why joy become the ideal beauty?

That isn't important for the context here as she was finished making the tweaks needed to just operate the FATE system once again. Next to her was Director Animusphere, watching in earnest of the progress being made. The test would start in a few minutes at this rate, which made the Director smile some.

"I see that the preparations are nearly complete, Da Vinci?" Director Animusphere asked in a calm tone.

"Yep, though it does bother me how it's so unreliable despite it being sound in design… perhaps something is needed as a catalyst that will lure heroic spirits here." Da Vinci said, hand on her chin in thought as she did.

The conversation went as per normal as people cleared out from the Summoning Room. That was with the exception of a failed Designer Baby named Momiji. It was a miracle she was still alive after the procedure during the Spirit Fusion process, but her chosen spirit refused to fuse at the time. That was three years ago to the day thereabout for her, and she was rendered permanently dead after thenproceedure. It was a shame that most of the signals were sound biased.

"Please leave the summoning room, Test Four is about to begin. I repeat, please leave the summoning room." A voice chimed in on the intercom, giving them about 30 seconds without knowing who it was inside. Momiji only knew she was too late when the room turned dark, the doors locking shut. Her time at Chaldea was short, but well fulfilled in her eyes. She only had about 5 years left to live anyways, so this was just jumping the gun in a sense.

A flash of light later in the room, Momiji was no more, but that wasn't to say that someone didn't replace her.

"Error, Error, Unknown Parameters Achieved. Summoning Successful." An automated voice spoke as the doors opened, some smoke leaving the Summoning Room as it met with the rest of the area. "System FATE is currently cooling down, next possible summoning time ETA 30 minutes." The automated voice then shut off afterwards. Director Animusphere and Da Vinci were confused by what that meant as they noticed a ping left from the desk, notifying them that Momiji's life force could no longer be determined to be alive.

"Send some images down in case the new summon is determined to be hostile." The Director said, several workers going to the Summoning Room to not see anything. That being said, they did have a sense of someone watching them like a predator would their prey of choice.

Located above the door, and initially out of sight kneeled a short, vulpine appearing servant with blazing orange hair, leading to black tips. Long bangs on the right side covered that sides eye, though the other was rather visible, being a calming blue color with flame like Iris' enveloped inside. Large Fox ears poked from her head, small tufts of black fuzz inside swiveling to take in as much sound as possible. Her face was that of Momiji's, though subtle changes here and there meant that the servant in question didn't outright kill her.

For attire, they wore mainly blue and black in the form of a proto-shinobi style Gi that hid her body frame quite well if the dark grey cloak she wore didn't hide it enough. A black fox mask was placed tenderly over her face, though her bangs did go over them a little bit. She also wore a pair of white boots with blue laces, the lower clothing being tucked in since they aren't exactly pants. They can be seen as pants though.

Hood raised to obscure her frame as much as possible, she jumps down into the middle of the Summoning Room, seeing the images. They looked like they were about to piss their pants when they spotted her, but calmed down when she showed no signs of attacking, merely watching them for a bit. This standoff went like this until Director Animusphere poked his head into the room, seeing a new servant has been summoned.

"Ahh, Now I see what was taking so long. Hello there." The Director said in a kinder tone. "I am the Director of the place you ended up in, it is a pleasure to have you with us." Formalities, huh? She can get used to that with him.

"I am Assassin Class, Herald of the Sun. Please pardon my lack of disclosure on my true identity." The assassin bowed politely, sounding eerily like Momiji, but without the droning that happens with deafness.

"It is alright, though with the information I have, I hardly have any data on you. Only some extremely brief things in Shinto Mythology." The Director said. "Assassin seems a fitting class however from what little I do see."

"I only did what I could to serve those I hold dear to me." Herald said with a small bow.

"Now before I allow you free reigns of the facility, I need to have you get checked by Doctor Romani. Since there are no records of you in the Throne of Heroes as of now, we wouldn't like to take any risks." Director Animusphere said. "Now if you may, please follow me."

Herald nodded, somewhat glad her Presence Concealment hid her spirit origin even to the throne at times, chart that down to decent luck. She followed the Director, spotting a younger Olga Marie on the way there who seemed apprehensive of the new servant around the facility. Sure she was glad she was there, proving that the FATE system worked when it wanted to, but for the fact she knew nothing about this new servant.

A few minutes pass, Herald getting a good idea of how the place works, considering it used to be an observation center. That lead them to the Medical Wing, standing there at the entrance was Doctor Romani Archaman. He had pale ginger hair in a pony tail, and a friendly look to him, despite a little mystery clouding it.

"Hello there, you must be the new servant that was summoned…" Romani slightly quieted at the end, muttering something about Da Vinci. Director Animusphere didn't catch it, but the Assassin giggled a little. This caught the doctor off guard.

"Assassin class, Herald of the Sun, and don't let her hear you say that aloud." Herald introduced herself, a smile being felt coming off of her. Romani paled at the thought of an assassin being in Chaldea, let alone in front of him.

"Hehehe…. How about we get you checked up? Don't mind the other person in there, she's a really kind person." Romani suggested, the assassin nodding as Director Animusphere bid his farewells for now. A short trip to the medical room that Romani was working in, the assassin walked in cautiously, spotting the other person.

"Doctor Romani-San, who is this?" the girl asked. She had pink hair and lilac eyes, though they flickered to a more golden sheen for just a brief moment, just long enough for the girl not to notice. She was in a Chaldea uniform, though it was more evident it looked like she was still being quarantined there, if on the last stages

"Ahh, Mashu, this is the new servant that was summoned. She hasn't said her real name yet, which is a bummer." Romani said before looking to the Assassin. "Just sit on the bed for a moment, and may I ask you remove your mask so I can see your face?"

"Very well, I am not given a true task as of yet, and my curiosity of humanity intrigues me." Herald said as with small wave of flames, her cloak and mask are gone, showing off that she also had a fox like tail, matching her hair color. Both of the others look at her with shocked expressions as they recognized the body she inhabited.

"Momiji? Is that you?" Mashu asked with a ton of curiosity.

"Is that the name of the body I have inhabited? She was very unfortunate to have been in the Summoning Room I think it was when it activated." Herald said. "She is no longer with us as I maintain the body entirely now. I have to adjust to it though still, being shorter than normal is bothersome."

"Oh, that's a shame. She was someone Mashu knew for some time, though she was completely deaf after an incident." Romani said as he looked at Herald. "Alright, so I'm going to do a couple of tests to see if there are any complications with your spirit origin if that is alright with you."

"I am alright with that, you may proceed." Herald said as Romani began his tests. It was a few basic things when it came to servants. Very little in the way of information came up though outside what was right there, her physical form that was. They identified however the approximate period of where she was alive as a servant; Shinto Mythology Japan, the Age of Gods. The system registered her as a Divine Spirit from there on, though what Divinity she held was so far unknown outside of her displaying trace amounts of flame magic.

"Alright, your tests are done, uhh.. would you like to be called Herald, Momiji, or by your true name by chance?" Romani asked, not wanting to be rude. This garnered an amused sigh from the Assassin.

"I can tell you are an innocent soul, therefore I will give you my true name." Herald said as she stood back on the ground. "I am Amaterasu's Judge and Executioner, Pyra Tsuyone. I will be in your care from now on." She more properly introduced herself with a formal bow.

Romani nearly fainted at the formal introduction of the Divine Spirit, baffled at someone so close to a Sun Goddess is standing in front of him, albeit with a borrowed body.

"Doctor Romani-San, let me help you." Mashu said, helping him to a nearby chair. Pyra's thoughts being akin to the Demi-Servant being an adorable eggplant kouhai. So far the Assassin was enjoying her time in the modern age, though many questions still lingered in her mind

Chief among which was what did Amaterasu want her to do? She never told her anything outside of 'have fun and learn from humanity.' Was this what she was talking about? She would need to commune with the Sun Goddess at a later point to figure out the details.

Appearing at the doorway was Da Vinci, who overheard the last of the conversation. "Seems like this genius has some competition." The Caster joked. "Leonardo Da Vinci at your service, Pyra, was it? I caught wind that your tests were completed here."

"You would be correct." Pyra responded as her cloak formed over her again, the hood down this time. "Have the people of Chaldea treated you well since your arrival?"

"If having my own place to work on inventions to my hearts content, then yes. Plus it's fun to tease the Doctor here." Da Vinci said with a small laugh, even more so when Romani tried to butt in.

Pyra couldn't argue against the supposed omnipotent caster. "I will take your word for it since I sense no deceit." Pyra said with a shrug. "If you three don't have anything for me to do, then I shall see about getting a feel for how Chaldea operates. My specialty is observation first and foremost." And like that, the assassin was gone.

"What do you two think of her? Despite her smaller vessel, she still proves to impose a powerful aura." Romani said with a nervous chuckle.

"She doesn't seem so bad, rather curious if you ask me." Da Vinci said with a pep in her tone. "She said she was a Divine Executioner? She has encountered many people more than likely in her life, but never understood them as much as she watched then. Being summoned as a servant perhaps was a chance to experience humanity first hand."

"When you put it that way, it does explain how she did look at things with much greater interest than most." Mashu said as she was still in the room after all.

"Well, the best we can do is keep an eye on her… IF we can keep an eye on her. She can hide her presence very well." Da Vinci said before leaving the room.

Romani and Mashu both looked at each other, contemplating on what to do for the meantime. What they didn't know was that things were about to get more interesting for them in the future.

(2 and a Half years later, Rayshift testing)

Since the fateful say of the 4th Summoning, the one known as Herald of the Divine sun, or simply Pyra now to the staff of Chaldea had integrated well into the routine of the Observatory's operations. Her and Mashu have been very close sense they met, sharing a Senpai-Kouhai relationship despite neither having a master. Something that was later learned about Pyra was her inability to contract with a master when she tried on Doctor Romani one day.

Two theories started from there thanks to Da Vinci. The first was either she was already contracted, therefore getting a supply of mana already. There are some holes in this as she would still technically be able to form contracts with other masters in that case, it might have to do with her High Divinity and status.

The second, and more interesting theory was that due to properly fusing with a human vessel, one with powerful magical circuits (Mashu has them too in this canon, don't @ me), her body naturally maintains Mana with the conjunction of passive skills. Pyra has demonstrated she has at least some ranking of Independent Manifestation, leading to the theory probably being the correct one. Either or, Da Vinci has found the Assassin to be a genuine puzzle that the Throne doesn't know too well itself.

Outside of that, during the past 30 months or so, Marisbury was unfortunately killed by unknown means outside of a gunshot wound to the head. Since then, Olga Marie took the reigns as Director, though that start up was nothing short of a clusterfuck. She was never taught proper leadership at Chaldea, leaving her easily frustrated and overwhelmed when things didn't go to plan. The other servants that have been summoned since, and the staff though have been doing their best to help Olga mature into someone they could truly see as someone who could lead them.

The first test appeared when the systems stopped observing the near future. That only meant one thing: Humanity's Extinction. Projected to happen within 5 years, Chaldea advanced as quickly as they could to develop a system to counteract this when a singularity opened up. That's what started the Rayshift program. The thing that was being tested on today…

"Okay, try to not have a mental breakdown this time, Olga… you can do this." Director Olga said to herself as she has been very pent up with frustration as of late. Next to her was Pyra in a modified Chaldea uniform so that her tail could be free, and her cloak was over it.

"You shouldn't stress yourself out like this, Director, you'll get wrinkles with that scowl at this rate." Pyra said with a bit of a tease. In the time that she's been at Chaldea, she has grown a bit of a sense of humor, but she still means well with her words.

"You hush, okay?!" Director Olga barked, though she didn't intend to be so harsh on things. Pyra understood that a bit, giving her a pat on the head after grabbing a chair. She hasn't grown at all physically, so this was the best she could do. It did make Olga chuckle however at the sight. "Alright, I get it, no need to go all mom mode on me."

"Mom mode? Is that why the other servants like me so much?" Pyra asked with an innocent tone as she was unaware of it. To her, it was just how she operated, and if that meant disciplining other servants for breaking Chaldea's rules (with a bit of Noble Phantasm in weapon form), she would do that.

Before the conversation could go any further, a worker came in with a black case, long enough to hold a weapon.

"Director, Assassin-San, we had another anomaly within the FATE system, we didn't know what that meant, so we came to you for advice." The worker said, being an average magus with blond hair and slim build.

"Open it up so we can see what it is." Olga said, her tone turning serious, but even Pyra knew she was curious. With that, the worker did, showing a beautiful black-eyed katana with some kanji at the base.

Pyra recognized the kanji, but her memories as to why were foggy at best. Yes, she was born in the Age of Gods, but even she is bound to have some memory loss. "It appears to be an anti-demonic blade. May I see it?" Pyra asked with interest.

The blade was appropriately handed to the Assassin, who took a couple of test swings. Perfectly balanced, and not too heavy, surely a master Swordsmith made this blade with care. "Is there any information about this blade that may be of use outside of the expert craftsmanship?" Pyra asked her second question to the worker.

"It showed up as a craft essence called 'Black Crimson Nichirin Blade,' ma'am. We don't have any information outside of that." The worker said as Pyra picked up the scabbard.

The design was beautiful, if not a little artificial in places with the use of more modern metals than what she was used to. "I know that name, Nichirin… It was a rare type of sword used by people who specialized in Demon hunting… I only have fragments of information myself about it as I wasn't active during these times, but it would appear according to the scabbard that this blade came from the Taisho Period."

"Less than 100 years ago? How is that possible?" Olga asked with minor disbelief. "The Throne won't accept things that modern, right?"

"Under normal circumstances, perhaps. I am unsure myself as to why it is here." Pyra said, looking at the blade again. "I will see what Archer Emiya thinks of this piece." Pyra then left into her astral form, along with the case and blade.

"I will go with her!" Mashu, who just came in then immediately left the room, a small creature trying to hop onto her shoulder chasing after.

Olga rubbed her temples a bit before proceeding with the Rayshift experiment. Trials proved to be rather successful with small objects like unused phones or some of the animals like geckos and fish bowls there. Things were more unstable when anything larger was used, but a safety mechanism kicked in when it knew it was going to fail, shutting off the Rayshift before it could transport whatever was in there. This was good since it was easier to make tweaks, especially with Da Vinci there to help in all of her geniusness.

Back with Pyra, and now Mashu, they went to the resident sword nerd/ mom in male form, Emiya. This Nichirin blade was an unusual case among bladed weaponry, but the fact only Pyra was familiar with it in the first place meant that things were only more confusing about the Divine Executioner.

"Emiya-San, may I have you look at something?" Pyra asked as they found the Archer class servant making sure his room was tidied up since it was early. The tanned servant looked over to see the Assassin and Mashu there at the doorway.

"Hmm? I would presume that case has something I can appraise and add to my Unlimited Blade Works?" Emiya asked with a neutral tone as usual.

"Yes, I want to see what the history behind this weapon is. It's called a Nichirin Blade according to the worker that pulled it out of the Summoning Room." Pyra said as she placed the case carefully on the Archer's bed, unsheathing it so Emiya could see. His eyes look at it with curiosity for a good while.

"While I can read the history of the weapon just fine, it confuses me as to how it exists. As far as I can tell, there isn't a location that sees perpetual sunlight, or at least one that I can immediately think of. Another thing has to do with the former owner. They were young, about your physical age, but used special techniques from what feels like breathing." Emiya said as he looked into the blade as much as he could.

"Thank you Emiya-San, I appreciate your appraisal of it. I would test it out in the simulations to see if what my initial thoughts were on it of its anti-demonic properties. It should be in similar vein to tour married blades if I'm not mistakened." Pyra said as she was ready to make her leave when the intercoms acted up.

"Unknown anomaly detected on CHALDEAS radar, Team A prepare for Rayshift. I repeat, Team A prepare for Rayshift."

"Wish us luck Emiya-san!!" Pyra said as she grabbed Mashu, and headed to the room where all the Rayshift pods were in. There was one small issue however, and that was the sudden malicious intent from one of the workers. Pyra steeled herself as she made it to the room. "EVERYONE CLEAR OUT NOW!!!" the servant yelled out, her true weapon out for the first time since her first appearance and simulations. Everyone that noticed took that as a way to dipski the hell out of that room, sealing the doors with Pyra and Mashu inside.

"Oh how I should've known the Divine Executioner would come to this room, but you are too late. This place is rigged to blow, and you're all going down whether you like it or not." The person said as they turned around, showing that it was a welcome friend to Olga, Lev Laniur Flauros. "Try as you might, humanity will be ripped from existence as he demands it." He added, but the Assassin wasn't having any of it

"If those are your final words, then you truly have lost yourself to your inner demons… no, to external demons if my guess is correct….." Pyra said in a low tone, her weapon glowing. "Sever your bindings to the living realm, and may judgement plot your afterlife… Divine Incineration!" Activating the Noble Phantasm, she hits the betrayer with one of the blades of her weapon, causing the inherit sins to burn both flesh and spirit away.

Considering that Lev was controlled by a Demon Pillar, he near instantaneously evaporated in the divine flames, only for that to trigger the explosion. The room was engulfed in the explosion, though luckily, no one else was harmed. That being said, both Pyra and Mashu vanished from the explosion, though not dead. A simple message said that Rayshift was successful, but the location was unknown, or any other information by that matter.

Olga saw this happen, and while lucky to be alive, she lost two of her closest friends to the blast. All she could do was cry for now at their disappearance. Chaldea can rebuild, yes, but the time for grieving was in session.

Where those two ended up, who knows. One thing is for sure is that a simple explosion wasn't going to kill them so easily…

So there is the first chapter of a redone, and while things have taken a different route than in FGO canon, it also has had minor changes to this story as well that will be conveyed in later chapters.

As for the canon changes?

· Olga Marie survives first and foremost.

· Lev is dead before the first singularity/prologue.

· Olga is not as desperate for attention as before thanks to Pyrassassin.

· More people are alive thanks to Pyra's warning to get the hell out.

Now for Pyrassassin's Parameters/ Bond things you see in F/GO

Herald of the Sun)

True Servant Name) Pyra Tsuyone

Gender) Female

Height) 150cm

Weight) 40kg

Alignment) Neutral Good

Stats))

Strength) C

Agility) EX

Endurance) A

Mana) B

Luck) B

Noble Phantasm) A

Passive Skills))

Presence Concealment A

Independent Action EX

Independent Manifestation A

Riding C

Goddess' Herald A (Works like Divinity A in F/GO)

So that should do, I will check in a bit to see how things are, and will answer should the demand be there. Opulent Neckbeard out!