AN
"Blah" - Normal Speech
'Blah' - Thoughts
Blah - Rider Gear

Fate/Stay Night x Kamen Rider
Journey through the Kaleidoscope

Fate/Stay Night x Kamen Rider Faiz
Fate/Exceed

Chapter 1: The Beginning of the Journey
Another day was coming to a close, the sun having long since sunk beneath the horizon and the late January night air carrying with it the biting chill of winter descended over the city of Fuyuki.

Due to a string of murders and gas leaks that had occurred as of late the local authorities had put in place a curfew that strongly insisted that population of the town were to be off the streets before it got dark and not to go out unless absolutely necessary.

As such the city streets were practically devoid of life, most of the cities residence having returned to their home bar a few that had chosen to take their chances.

One such individual was a young woman in her twenties, her long black hair hanging down to her waist, clad in a long red over coat that she wore over a white polo neck jumper, a black mini skirt and long leather boots.

For Tohsaka Rin today had been a long and emotionally draining one. Her flight from London had touched down at 6:00 am and from the moment she set foot on solid ground her day had been a near endless whirlwind of activity. From cleaning and airing out her family home, making sure that reconnecting the phone line and power as well as getting in touch with several individuals to inform them of her home coming along with several other minor tasks.

None of that of course include the real business that had forced her to endure an almost 12 hour flight that had carried her from London all the way back to her homeland of Japan and to the city of her birth.

As she crossed the bridge over the river ran through the centre of the city Rin took a moment to gaze out at the skyline of the city, looking out at the high rise buildings of the business district that stretched towards the sky.

Standing there taking in the sight of the city and feeling the night air on her face Rin allowed herself to feel human for a moment, to acknowledge the nostalgic feeling that being back in Fuyuki filled her with. Whilst she did not regret her time in London and was proud of all the work she had done and the achievements she had accomplished as the apprentice of the Wizard Marshal, five years was still a long time to be away from home.

As she took in the skyline her gaze was drawn towards one building in particular that reached higher than the others surrounded it, one that bore the name of the company on each side of the building: Smart Brain. The sight brought a frown to Rin's face. She couldn't explain why but something about them had never sat right with her.

In the wake of the fire that had consumed a large portion of the city, as well as claiming the lives of over 500 people, Smart Brain had moved in and pretty much bought up the entire city, footing the bill for its reconstruction and overhauling its infrastructure as well as promoting and sponsoring its various businesses and institutions. All in return for slapping their logo on practically every inch of town.

After settling in at the Clock Tower Rin had spent a sizable chunk of her free time going through its archives, trying to find out if Smart Brain had even the slightest connection to the Mages Association or any of the Magus families or institutions. Despite countless hours spent searching she'd found nothing.

As far as she could tell Smart Brain was simply a Japanese based corporation with no connection to the Moonlit World what so ever. However despite knowing this it still didn't make her feel any better about it.

Rin shifted her gaze away from the large building, turning it towards the direction that she had come from, her eyes drawn to the hill that stood in the distance, high upon it where a single building was located. The sight of it doing little to improve her mood.

Up there was Fuyuki Church, the building in question serving as the home of the man who had been part of her life for much of her childhood as well as her adolescence: Kotomine Kirei. In all her years of tutorage under him since becoming her legal guardian following the passing over her parents she'd made it a policy to never go to see him unless absolutely necessary. Any request made by him to drop by the church upon the hill were to be ignored at all costs.

So why had she acquiesced to his demand after five years of not seeing him? Had the feelings of nostalgia brought on from returning home for the first time in five years really made her so soft?

No way, she refused to even entertain the idea. Jetlag, definitely the jetlag was to blame.

Regardless she was too tired to begin trying to figure this out. She'd been awake now for over 24 hours since landing coupled with barely taking any time to get some rest or get a proper bite to eat, as such she was running on fumes so to speak.

Right now her only plan was to return home as quickly as possible followed by long and much needed was a long soak in the bath, followed up by a full night's sleep and good meal in the morning to bring her back to herself. Worries about fake priests and Holy Grails could wait until the morning.

Pushing thoughts of the matter aside Rin resuming her journey across the bridge that separated Miyama and Shinto and the lights of Miyama Town came into view, walking with purpose with intensions of heading back towards the Foreigners district in which the Tohsaka manor was located. Just as the dark haired heiress approached the end of the bridge the sound of a loud and panicked sounding scream suddenly filled the air, the sound of which brought her to a halt and looked around to see

Muttering a curse Rin quickly made her way down to the path near the water's edge, following it in the direction in which the scream had come from. Before long she was met by the sight of a middle aged man in a business suit leaning against the railing. Another of the cities residence who had taken their chances and stayed out past curfew.

Hearing her footsteps the man turned his head in Rin's direction, a look of utter terror etched into his face. "Hey, hey." Rin told him, trying to sound reassuring. "Do you need help?"

Before he could reply the man's skin suddenly turned an ashy grey and he collapsed to the ground where his body dissolved into a pile of ash, leaving only his wrinkled suit behind. Seeing this Rin quickly took a step backwards, almost stumbling as she did so, a chocked breath escaping her throat.

"WH…what…" She managed to say, her veneer of the image of a perfect Magus faltering and she found herself on the verge of having a freak out. "No, no. It can't…"

Before she could begin to fully process the events that had just transpired a splashing noise was heard and looking round Rin was greeted by the sight of a grey skinned humanoid creature crouching on the ground a short distance away from her, slowly it got to its feet and it turned to face her revealing that its dripping body was covered in plate like armor and its fish like head.

The sight of this creature caused the dark haired Mages breath to catch in her throat and her eyes to widen. All of a sudden she was transported back five years, back to the night of the Homurahara Academy incident. Feelings of confusion and fear flooding through her system, her ears filled by the sound of screams of terror and the image of bodies of students scattered motionless on the ground. Vividly she recalled seeing Ryuudou Issei, a look of pure terror on his face, reaching out towards her pleading for help moments before his body dissolving into a pile ash leaving only his uniform and glasses behind.

And to top it all off, it was there as well, the creature that had haunted her dreams for the past five years. Its grey coloured body and head resembling that of a humanoid wolf with a canine like snout and ears protruding from the top of its head and a bushy tail extending from the base of its spine, looming over her, gazing down at her.

"Well, well. What do we have here?" The creature spoke up, snapping Rin back to reality. "I gotta say miss, you look a lot better than that other guy. Maybe this is my lucky night."

Quickly Rin composed herself, recalling the lessons instilled in her by both her father and Kotomine about the importance of keeping one's head, instantly her visage became the cool composed veneer of a First rate Magus.

"Answer me creature, as Second Owner of this city I demand that you answer me." She said, her tone firm. "Are you a Servant or maybe some kind of familiar?"

"Ohhh, feisty. Gotta say Miss you've got both a pretty face and spunk. I've got no clue what you're talking about but it sounds pretty important." The fish man replied, then with a flick of his wrist a long bladed weapon that looked to be some kind of trident materialised out of thin air and into its hand, pointing it in her direction. "Shame too that I gotta do this. Who knows, perhaps you'll be one of the lucky one and get to be reborn as a superior form of life."

Muttering a string of curses Rin began wracking her brain trying to decide how to best handle this situation, biting her lip as she did so. Presently she was tired and unprepared, not the best condition to be it when suddenly find oneself in an unexpected fight.

Glaring at the grey skinned creature she watched as it slowly began taking a few steps in her direction, unprepared or not it seemed that fighting was unavoidable but that would mean she ran the risk of burning through a good portion of the prana that she had been saving up in preparation for Holy Grail War and even if she did she had no idea just how effective Magecraft would be against this creature."

As the grey skinned creature's was drawing closer, its pace slowly increasing as it did so, raising its trident it swung the weapon at the dark haired heiress who in turn narrowed her eyes and growled in frustration, within moments a sudden warmth washed over her as she effortlessly flooded her system with prana, allowing her to effortlessly to avoid the trident each time that the grey skinned creature slashed it at her.

Channelling her prana Rin raised her hand and pointed a finger at the grey creature in a manner a child would when pretending that their finger were a gun. "Gandr…" She announced, dark red energy began manifesting at the tip of her finger that she fired several dark bolts at the creature who with surprising speed used its trident to block each of them.

As the strange creature took another swipe and her Rin leapt backwards, reaching into her coat as she fired off another barrage of shots, all the while muttering a string of words in German as she did so. Retracting her hand she produced a crystal the size of her palm that she then tossed at the creature, seconds later she fire another Gandr shot that struck the gem causing it emit a bright light. "Boom."

Seconds later the gem cracked open and shattered, releasing a large amount of energy accompanied by a burst of bright light and heat, kicking up a cloud of dust that engulfed the creature and obscured it from view.

From her position Rin took a few deep breaths, "I…I," She managed to say thought breaths. "Did I get it?"

After a few seconds the light created by her destroyed gem died down and the dust settled, revealing the grey skinned creature still standing there looking completely unfazed. Seeing this Rin's eyes widened and her breath caught in her throat. "Wh…what, no…"

"Gotta say that was a pretty unexpected, dunno what that was but it sure stung quite a bit." The creature said, brushing its chest with the back of its hand before pointing its weapon back at the dark haired Magus.

Her face twisting into a scowl Rin's glared at the grey skinned creature, refusing to allow this thing to see the growing nervousness that was boiling inside of her. What was she going to do, whatever this thing was it was fast and despite the spell she'd stored in that gem not being partially powerful it looked as if it had barely slowed it down, meaning it was apparently resistant to Magecraft and whilst she had some training in hand to hand combat she couldn't be sure that she was confident that it would be enough to win against this thing.

Was this it for her, was she going to die here before the Holy Grail War even started? Killed not in battle with another Magus competing for the Grail with a Servant at her side but by some unknown creature?

Fortunately for Tohsaka Rin she was not fated to die that night, unbeknownst to her the same scream from earlier that had drawn her here had also caught the attention of someone else.

Whilst the exchange between the dark haired Mage and the grey fish man had been going on,neither of them had noticed as a figure approached them from the direction of the bridge, a strange looking belt wrapped around his waist, with a flick of his wrist a phone it was holding flipped open and pressed one button three times followed by enter.

5…5…5… Standing By…

"Henshin…" He said before snapping the phone closed and inserting it into a slot on the belt, sliding it closed as if to complete a circuit.

Complete…

A flash of red light caught the attention of both Rin and the fish man, looking over both of them were met by the sight of a figure standing a short distance away from them, his body covered in a skin tight black body suit worn under a silver chest plate that was divided, vertically, by a red line. The same red lines travelled down his arms and the front of his legs. His shoulders were protected by round silver pads. Around his waist was high-tech silver belt with a cell phone lodged in the buckle, a laser pointer hanging from the right, and digital camera attached to the left. On his head was a helmet with yellow, insect-like, eyes, and a pair of small red antennae.

"…R…Rider…" The fish like creature said, taken aback by the appearance of the armored individual that stood before them.

'Wha…R…Rider…' Rin thought frantically, 'Wait, could this thing be the Rider Servant?'

"Well isn't this lucky." The fish man said, quickly getting over its shock. "Hey Rider-san, my bosses are really interested in that belt you've got there, you being here saves me the trouble of looking for you."

The 'Rider' said nothing as he stared at the grey skinned creature in stern silence.

"Not the talkative type huh." The fish man continued as it twirled its weapon, "That's fine. Just means it's gonna be all the more satisfying to hear you scream in pain."

With that said the grey skinned creature then charged forward, spinning its weapon before grasping the pole in both hands as it readied to strike the armored figure down. Seeing this the Rider flicking his wrist before ducking out of the way of the fish man's weapon as it took a swing at him, an attack that was quickly followed up on by two more.

Taking a step back to avoid another of the fish man's swings, the Rider with the glowing yellow eyes grabbing the camera looking devise from off of his belt and flipped out a handle from the back before slipping it onto his right hand, forming a knuckle weapon.

Now armed with a weapon the black suited Rider ducked out of the way of another swing aimed at him by the grey skinned fish man before reaching out an grabbing the shaft of the trident in both hands, both combatants pulling back and forth as they did their best to try pry it from the grip of the other.

With a mighty heave the Rider managed to pull the fish man in close, close enough to drive a knee into the creatures gut, causing it to grunt in pain, and followed in up with a vicious head butt, this proved to be enough for it to release its hold on the weapon and stumble backwards moments before the dark suited fighter kicked it in the chest and sent it sprawling to the ground.

Seeing that its opponent was down the Rider tossed the trident aside, the weapon falling into the river below, before the armored figure reached down to the phone that was mounted in the belt around his waist and detached a chip from it and attached it to the knuckle weapon mounted on his fist.

Ready…

With the chip now in place he then flipped out the phone open and pressed the Enter button.

Exceed Charge…

A small glowing dot of red energy emerged from the belt and travelled the length of the Rider's body though the red detailing on the suit up towards his arm, and entered the knuckle weapon that was mounted to his fist.

Getting to its feet the fish man charged at the Rider again in a last ditch attempt to defeat the armored fighter and swung wildly at him which the Rider ducked effortlessly under and drove an uppercut into the creatures gut, blue flames igniting from the point of contact and spreading across its body before it exploded in a flare of blue fire and turned to ashes as a red glowing Φ symbol hovered over where it had been moments before.

The fight over the Rider slowly removed the knuckle weapon from his hand and returned it to its place in his belt, however just as he was about to walk away a bolt of dark energy whizzed past his head, catching his attention.

Expecting perhaps another enemy the Rider quickly turned on his heel to face this new attacker and was greeted by the sight of Rin, more dark energy gathering at the tip of her finger that was pointed at him, the sight of her causing his eyes to widen and his breath to catch in his throat. 'T…Tohsaka…'

Whilst the armored figure and the fish man had been fighting Rin had watched them, trying to make sense of what was going on and just who this mysterious armored figure could be.

First thing was that from watching as the two of them fought Rin could conclude that whoever this was they were having far more success fighting the grey skinned creature off than she had, not only that the fish man had identified her mysterious saviour as 'Rider'.

Given the nature of the world in which she dwelt in, along with the figure being called by a particular title, Rin's first assumption was that this figure could possibly be a Servant, it would explain the strange power that they seemed to possess. Although give his appearance, abilities and power it had shown off she couldn't think which Hero of Legend this could possibly be.

So maybe this wasn't a Servant but rather a person wearing a specially designed suit, someone that just happened to have the same title that also by coincidence happened to belong to one of the seven classes of Servant summoned as part of the ritual referred to as the Holy Grail War.

If this was indeed a person then who could they be and what was their reason for showing up in this city on the brink of the Grail War? Could it be they were a Magus that had come here to participate, that made some sense to her, perhaps whoever this came from a family that specialized in armaments and whose craft was more based around combat then academics and wished to test their creation ahead of the ritual?

Although something that stuck out to her was the design of the belt that they had attached around their waist, to her it looked to rather cumbersome and out of place. More like a piece of technology then anything designed by a self-respecting Magus.

Rin inwardly scoffed at this. The idea had long since been drilled into her that the idea that technology could ever be a match for anything produced by Magecraft was to be laughed at. No, it had to be some kind of Mystic Code, a specialized suit of armor bolstered by Magecraft.

Second, watching as the creature had dissolved away into a pile of ashes following its defeat told her that it was neither a Servant nor a familiar of some kind, if it had been either it would have faded away in a swirl of energy when it died. That meant that it had to be some kind of creature, not that that really told her what it could be.

What was clear to her however was that whoever this mystery figure was, be they a Mage a Servant, she owed them her life and more than anything, if there was one thing that Tohsaka Rin could not stand it was being indebted to anyone, even if they had saved her life.

Seeing that the armored figure was beginning walk away and needing answers Rin quickly sprang into action, summoning up more of her energies she fired a shot at the retreating figure, purposely missing them in an attempt to get their attention.

"H…hey…" The dark haired girl called to the black suited man who was standing a short distance away from her, her tone more harsh than she really intended but she was determined to keep her composure and give the appearance of being in control. "Answer me, what the hell was that thing and who the hell are you? Are you Servant or a Master?"

Rather than answer her, the Rider instead removed the phone from his belt, flipping it open and punched in a new code before hitting enter.

5…8…2…1… Auto Vajin Come Closer…

Despite her confusion as to what the Rider was doing, Rin refused to show any weakness and continued to glare at him, that was until a noise as well as a light coming from behind her caught her attention and looking over her shoulder was met by the sight of a black, red and chrome dirt bike racing along the path in her direction.

Seeing this Rin quickly jumped out of the way of the speeding vehicle, diving into a roll and quickly rising into a defensive crouch. The bike however continued onwards towards the Rider where it screeched to a halt. Not wasting a second the armored fighter quickly mounted the bike, revving the engine several times, before accelerating it up the grassy bank and up to the street above.

Noticing that her target was getting away Rin fired several Gandr shots in their direction, muttering a curse under her breath as she did so, only for them to come up short, not wanting to lose him she pushed prana into her legs and made to pursue the Rider up to street level only to find that he had completely vanished when she got there.

Open your eyes for the next Faiz...

"S…Senpei, it's you?"

"How could you? Why did you let everyone think that you were dead?"

"That night...I learned that I can never be a hero."

(blood curdling scream)

"Henshin…"

Compete...

AN And with that another entry is fini. So yeah, I bet none of you saw a Fate/Stay Night crossover story with Kamen Rider Faiz coming.

I'm actually somewhat surprised that no ones tried to do a Fate crossover with Faiz, sure Faiz is more technology based Rider however I figure it would serve as an interesting counterpoint to the more mystical elements of the Fate plus Faiz itself is something of a divisive show amongst Kamen Rider fans so that's got something to do with it. Me personally I don't really mind it, its not a top tier show but for what it is its certainly not the worst I've seen. And like I said in the first chapter you could get any Rider series to work with Fate with some imagination and creative writing.

But yeah, getting back on topic, just imagine a scenario where Shirou and Rin not only have to deal with the other Servants and Masters as well as the machinations of Kirei and Gilgamesh but you also have the Orphnochs as a third element in the war with Smart Brain, who as mentioned in the chapter itself controls all of Fuyuki, operating in the background whilst having the members of Lucky Clover be their enforcers.

As you probably noticed I changed the date of when the Fifth Holy Grail War takes place, moving it from 10 years after the Fourth War to 15 years later, this was done as as way of incorporating several of the story beats from Faiz on top of the usual Holy Grail Wars stuff which means everyone is 5 years older then they were in the canon story. One of those story beats being the mystery of the incident that happened at the Ryusei School, which in this took place at Homurahara Academy instead, anyone whose seen Faiz you knows what big deal that was, of which Rin a survivor of. Also means that several secondary background characters from Fate happened to who got caught up in the incident are not appearing.

Also before anyone asks the reason that I don't refer to the monster as an Orphnoch is because this mostly written from Rin's perspective and at this point in the story she doesn't know what one is. If this were to continue the next chapter would be written from Shirou's POV, similar to how the first 2 episodes of UBW are the same events playing out from different POV's with the first focusing on Rin and the second with Shioru.

As for which characters from Faiz would make it into this I doubt many would included, rather I'm leaning towards using elements from Faiz and mix them in with some of the Fate characters, 2 examples of that would be Rin and Shirou who would have some elements of Mari and Takumi's story mixed in with their own.

As for which Faiz character's would make it into this story I know that Kiba Yuji/Horse Orphnoch would definitely make it in, he'd be a former student of Homurahara and classmate and friend of Rin's and would at least be familiar to Shirou. Aside from that I'm not sure who else would make it in.

As for Kusaka Masato/Kamen Rider Kaixa I'm not sure, I know we all love to hate him but I don't see him making it into this. I have an idea as to who would use the Kaixa Gear which only leaves Delta who've I've not decided the main user of yet. Also unsure wheter or not I could find a way to work in the two movie Riders Psyga and Orga.

Oh, and for anyone who's curious where I got Rin's flight being nearly 12 hours from I got that from looking up the flight time between London and Tokyo, according to British Airway's website a non stop flight from London Heathrow to Tokyo's Narita International Airport is approximately 11 hours and 40 minutes.

On a side note the Gaim chapter is now finished and Den-O is currently being worked on, I've been kinda busy lately so I've not had a whole lot of time to work in it recently. I've also been toying with an idea for a chapter based on Zero-One lately.

Before I sign off I got a couple of questions on the last chapter, one from tormeric246 and the other from hawko2632. Tormeric's was in regard to the VA's who did the voices of the Imagin's from Den-O have also played roles Fate Grand Order. Yes, I did know that, in fact most of the Taros's have roles in Grand Order, probably the most notable is VA's Ryutaros's VA, Kenchi Suzumura, who played Dr. Romani. The big villain of GO prior to the lost belts, Leff Lainur Flauros, who's voiced by Tomokazu Sugita who was also Kivat in Kamen Rider Kiva.

Even if we stick to Fate/Stay Night and Fate/Zero most of the actors in those shows have also had roles in Tokusatsu including both Kamen Rider and Super Sentai, mostly monster of the week roles. Hell Gilgamesh's VA Tomokazu Seki has been in a shit load of Tokusatsu shows and movies, one of the first being Prince/Kaiser Buldont in Ohranger and the most recent of which Zenkaiger.

Shirou - Was the voice of a pair of Debo Kaijin in Kyoryuger
Shinji - Has been Ultraman Gaia, Kamen Rider the First, Ultraman Zero, voiced Kamen Rider Yuki in Saraba Den-O and Shou Ronpo/Ryu Commander in Kyuranger
Kiritsugu - Obviously everyone knows he was Jin the Gale in Black RX, Bujin Gaim in the Gaim/Wizard movie and Ohma Zi-O in Zi-O but has also been in Tokkei Winspector, Tokkyū Shirei Solbrain, Tokuso Exceedraft, Tokusou Robo Janperson, Blue SWAT, Goseiger and Drive Type Future
Irisviel - She was one of the voice for the Ganmaizers well as Takeru's mother in Ghost
Kirei - Had been in Flashman, Maskman, Liveman, Solbrain, Gokaiger, Ryusolger, Zenkaiger and was the voice of the Birth Driver in OOO, Roshou in Gaim and Azald in Zyuohger.
EMIYA - Had bit roles in Kuuga, Shinkenger, Go-Buster and ToQger as well as the narrator and voice of the Kamen Rider Chronicle Gashat in Ex-Aid
Cu - Voiced monster of the week in Hibiki, Den-O, OOO, ToQger and voiced Bangray in Zyuohger
Medusa - Was in Tetsuwan Tantei Robotack and Chousei Tantei Sazer X
Medea- Voiced Hades God Gorgon in Magiranger
Kojiro - Voiced Sieg in Den-O and voice of the Genesis Driver in Gaim
Issei - HAs been in Carranger, Hurricanger, Boukenger, Gekiranger, ToQger, Ninninger, Lupinranger Vs Pataranger and voiced Air Pollution Kitaneidas in Go-Onger
Waver - Has been in Dekaranger, Magiranger, ToQger Returns, Kyuranger and voiced Speedor in Go-Onger
Iskanda - Has been in Ohranger, B Fighter Kabuto, Megaranger, Gingaman, GoGo V, Ryusolger VS LuPat movie and voiced Hades Wise God Dagon in both Magiranger and the Goseiger/Gokaiger movie, Champ in Kyuranger and was the voice of the Seiken Swordriver in Saber
Tokiomi - Voiced ARK in Zero-One
Diarmuid - Another long time Toku voice actor, has been in Gridman, Timeranger, Magiranger, Ultraman Zero, Ultraman Restsuden, Ultraman Greed, Akibaranger, Lupinranger VS Pataranger, Ryusolger and voiced Salamandes in GoGoV, TopGaler in Abaranger and Negataros in Den-O & Kiva Climax Deka
Hassan - another veteran toku actor. Has been in B Fighter Kabuto, GoGo V, Kuuga, Timeranger, Gaoranger, Ultraman Cosmos, Abaranger, Ultraman Nexus, Magiranger, Ultraman Mebius, Den-O, Gekiranger, Go-Onger, Decade, Shinkenger, Goseiger, Kyoryuger, Ghost, Ninninger, Ex-Aid, Dino Force Brave, Zyuohger, Lupinranger Vs Pataranger, Ryusolger, Kiramager and voiced Doggie Kruger/Deka Master in just about everything the Dekarangers showed up in.

And like I said, this just the characters from Zero and Stay Night, that's not even getting the spin offs and other media. Heck, here one for that might blow your mind: Mordered's VA from Apocarypha and Grand Order, Miyuki Sawashiro, also did the voice of Kivala in Kamen Rider Decade.

As for hawko2632 they asked was how can you mix the history of Kuuga, Agito and blade into the fate universe, as these Kamen rider series involves history that dates back to the creation of humanity. Also whether the OOO Driver would considered Magecraft in nature or science in nature?

First, regarding the question about working in the backstory's regarding shows like Kuuga Agito and Blade into the Type Moon universe, I don't think that its really difficult, it might depend whether groups like Clock Tower would be aware of them or not. For example the Groungi were a lost civilisation that was only rediscovered a short time prior to episode 1 of Kuuga whilst the Overlords of Light and Darkness from Agito predate not just humanity but life in general so it would make some sense that the Association would have no knowledge of them.

As for how you can mix the Undead from Blade into the Type Moon Universe, there is a story on this site called Undead Blade World and whilst it does some things that I'm not big fan of it dose have a good bases of how to mix the Undead and the Battle Royal into the Fate Universe.

As for the OOO Driver I'm entirely sure. It was created to utilize the power of the Core Medals which would suggest that its a piece of ancient technology but then again it was also the seal on the casket that held the Greeed so I guess a case could be made for either.

And with that I'm done for now, please feel free to leave feedback because I'm curious as to what you all thought about this one. Next chapter will be the fifth and final chapter of the Fate/Kamen Rider Ghost story that I wrote way back when but ultimately never posted it. And if you've got any questions feel free to ask. Once that's up I'll be moving onto the chapters I've since starting this little project.

Till next time, peace out y'all