Fanfic #81 Imaginary Seas by Ryuugi(FateGrandOrdwrXPercyJackson)

This fanfic is a crossover between fate grand order and Percy Jackson with Percy as the mc. I have to admit I don't really know much about Fate Grand Order, so I don't know how many elements are from the actual story or made for this fic, but I are really like the exploration of this world through Percy's eyes. I also really like the mix of machines and gods, it's a an interesting combination.

Synopsis: The Earth was wiped clean, override, the whole of Human Order displaced by worlds gone by. But in defiance of its own destruction, the world summoned heroes to undo what had been done. In a world that had been frozen; in a world that have been burned; in a world that had been halted; in a world that had been overwritten--and even in a world that had been preserved, heroes manifested. In the Titan's Ocean, the Son of the Sea God awoke, charged with its destruction for the sake of Mankind.

Rated: M

words: 51k

https://forums.spacebattles.com/threads/percy-jackson-fate-grand-order-imaginary-seas.844895/reader/

Here's the first chapter:

When I awoke, I was surprised and not just by the fact that I found myself on the shores of seas I didn't recognize. I didn't awaken from sleep—I didn't even awaken from death. I awoke from nothing; I came into being, took a breath, and was. That didn't make any sense to me, because last thing I'd known, I was pretty sure I was about to die, but after a moment, something came through. It was hard to describe, but the connection felt shaky, like a phone call filled with static, but the World reached out to me and gave me a rough idea of what was going on.

I was a 'Servant.' I'd been summoned by the World to stop something that had already happened, to undo it somehow. The Incineration of Human Order, the Revision of Human Order…I understood what was going on, more or less, I guess, at least to the extent of receiving a detailed briefing about it ten seconds after coming back to life. 'The world is fucked, so go fix it,' is what it all pretty much boiled down to, anyway. The details were kind of foggy on how, sadly, along with who, what, where, and why, though I knew it was January 1st​, 2018, at least. The past, for me, though that was hardly the weirdest thing about this situation, I supposed.

I wasn't alone, I knew that much instantly. The World had summoned others like me, 'Heroic Spirits' incarnating as 'Servants.' My first thought was kind of 'Wait, are you just going to throw heroes at this problem to die until its fixed?' but thinking about it, I guess that was pretty standard for my life. 'Find the others who'd been summoned and save the world before you all die.'

Yeah, sure, okay. Thanks, World.

Cracking my neck, I looked up at the sky and sighed. I wasn't that upset, really, and even the edge of irritation I felt faded as I stared quietly up at the beautiful night full of stars. The world was in danger and I understood that. I was ready to face it, even. Just, wow, what a wake-up call. 'Whoops, the world already got blown up, can you still fix it? P.S., this is the second time it got blown up like this, just fyi.' Yeesh. How the hell do you deal with that?

"By finding the others and figuring this out, Percy, come on. Get your ass in gear," I said, wiping at my face. I was clean-shaven, I noticed. Despite my words to myself, that was still enough to waylay my thoughts and distract me. I knew mentally that I'd been summoned at the prime of my life, but I had no idea when that was. I felt different. Strong—stronger than I could even remember being, if I ever had been, and young, I guess. But what was the prime of my life? Not when I was sixteen, I hoped. I mean, it'd make sense, in a way? But at the same time, I sure hoped not.

Well, easy way to find out, I thought as I walked out to sea. The water hardened beneath my feet, letting me walk on it easily, and then went still. The tides stopped all around me, the churning dirt and sand drew away beneath the waves—the water within ten feet of me became like a black mirror, reflecting the night sky, and me, lit from the side by the moonlight. The moon drew extended shadows on my face and washed out the colors, but my eyes were keen enough to see clearly even so. In the water, my face was younger than I'd seen in decades; I must have been in my early or mid-twenties, something straight out of my wedding pictures. My hair was as disheveled as ever, my eyes the same as they'd always been, but my face was the only part of me I could see, since the rest of me was covered in armor. It wasn't mine, I thought immediately, because I'd never worn anything this…gaudy. It was gold, every bit of it, from the three-pronged crown on my head, to the wide shield I'd barely even noticed the weight of. It covered me from the waist down, along with my hands and arms up to my shoulders, and a layer of gold around the center of my chest.

I use the word 'around' deliberately, by the way; it barely covered my nipples and the center was very much on display. For some reason, there was nothing beneath it or below it, showing off my pecs and abs, but still—

"Why is there a boob window?" I asked, which was honestly giving it too much credit; frankly, it was mostly window. It was closer to being a metal bra than a metal tank top. At least there seemed to be actual pants below my lower armor. But the worst part? It was definitely my dad's—I could feel his power flowing through it. For all I knew, and quite disturbingly, he'd even worn it beforehand. Which just served to underline and emphasize the question—"Dad, why is there a boob window?"

XxXXxX​

I decided to spend the night in the sea. It wasn't because I was worried someone would see me. It wasn't, okay? I was just investigating.

The first things I found out were as confusing as they were concerning—I was in the Atlantic, near some island I wasn't familiar with, if island was even the right word. Beneath the island was enormous chunks of some metal I wasn't familiar with, but which felt a lot like Celestial Bronze and Imperial Gold, only it wasn't either of those things. Whatever it was, it somehow kept the islands afloat and allowed things to grow on top, so there had to be some magic to it. But even beyond that, something about it seemed to call to me.

I touched it; I admit it. I don't recommend touching strange magical metals, as a rule, but I'm a maverick who likes to live on the edge or something and I did it for science. Anyway, nothing special happened when I poked it, except that something in my senses resonated with it, like it was a sunken ship, or part of the remains of one. Like some utterly enormous ship had exploded and just one of those pieces was sufficient for an entire island to grow on top of it. What's more, a part of me resonated with it, like it was familiar. It was weird.

It meant I could just swim under them, too, which was a rare experience. I could float down to the bottom of the sea, lay on my back and just look up at it—not that I could see it from the bottom, mind you, except as a hundred shades of temperature and in the disruption of the currents, but it was still weird. It's hard to describe, but think of it like…like seeing an eclipse instead of the sun. Down here, everyone else would see only darkness, but I could tell where the sky began, and here it didn't.

One hand behind my head, kicking my feet absently, I turned my head to the side.

What do you think about all this, fish? I asked.

Lord? One of the dwellers of the deep replied, surprised to be addressed but clearly recognizing me. It was a, uh, whosawhatsit fish, one of the glowy ones. It and the other fish had simple made room for me without question down here. Think of what?

Sorry, that was kind of vague, I acknowledge. How long do you think this island's been here?

Since forever, Lord, the fish said. It was here in my father's time, and his father's, and his father's before it, on back as far as anyone could remember.

For all I knew, this fish had a life-cycle measured in days, but I nodded my head with due gravity. Also, come to think of it, he was a deep sea fish, so he probably couldn't actually see the island, meaning this was from generationally-removed gossip, which fish were well known for; it's what made talking to them interesting to begin with, but also the problem with it. Still, I was comfortable and wanted someone to talk to.

Still, it's a bit odd for an island, right? I mused. Not going down to the bottom, I mean. And being part of a ship. I still don't know how to make sense of that, because what type of ship could make this whole island? A spaceship?

All the islands are like that, Lord, the fish corrected with seemingly reluctant bravery. All of Atlantis.

I looked at the fish quietly for a moment. Atlantis existed, of course, but it had sunk; my dad had his palace there. Only, apparently it had unsunk, or I guess never sunk.

Of course, I said. Do you know where my father is, by any chance.

Still beneath Mount Olympus, I believe, the fish said.

Right, I said and then mused over the island ceiling for a bit. It seems I couldn't just lay back and wait for the solution to all my problems come to me. I'd need to go up there and talk to people, instead.

But it was nighttime and no one would be awake, anyway, so I took a nap first.

XxXXxX​

"Romani, we're going to start the Rayshift soon. Could you come in case there's an emergency?" The man beside me said. I very deliberately didn't even look at him, careful to give nothing away, but I was reassured by having him here. As long as he was here to support me, as long as he still believed in me, I knew I could do this. "The A Team's in perfect condition, but B Team is less experienced and they're displaying some slight abnormalities. Its probably just anxiety, but—

"Hey Lev," the doctor replied over the phone. "I feel bad for them; you can't expect anyone to relax inside of those coffins. Why don't I give them some anesthesia?"

"Yes, good, just hurry, will you? If you're in the infirmary, then you should be able to get here in two minutes." Lev said before hanging up. I wanted to tell him he was kidding himself if he believed Romani was doing his job right now, but this wasn't the time to bemoan my subordinates, either. Lev's smile made me relax a bit, regardless. "It's just a precaution, don't worry. A Team is as flawless as ever. You just have to stand here and give the command and everything will go the way it's supposed to."

I nodded firmly, trying my best not to give away how tense I felt, and looked at A Team, already situated in their coffins. Their files were splayed across her desk, not that she needed to read them; she knew every detail in their files by heart. Whatever else she thought and felt, she believed they could do this. Kirschtaria Wodime, intended Servant: Lancer. Ophelia Phamrsolone, intended Servant: Saber. Scandinavia Peperoncino, intended Servant: Archer. Hinako Akuta, intended Servant: Rider. Beryl Gut, intended Servant: Assassin. Kadoc Zemlupus, intended Servant: Caster. Daybit Sem Void, intended Servant: Berserker.

They, the Chaldea Security Organization, would save the world. She'd prove it; she'd make it happen. She watched the countdown tick down—the Unsummon Program started. The Spiritron Conversion began.

"Rayshift begin," she couldn't help but say outload. "In three, two, o—"

And then, her dreams, her moment, every she worked for, came to an end, with a sudden explosion that shundered the control room. In the end, only I was left. The skin torn away, only the spirit remained. I turned my head to the side, only now free to move, and saw her there. Her skin faded from pure white to dark blue and she was naked from her head to her toes, or at least seemed to be. Her modesty was just barely preserved by the markings on her skin, making patterns like gloves, leggings, and a choker out of an astral seeming material. Her hair was a grey so faint as to be transparent, her face was split horizontally into an upper half that was light blue and a bottom that was pure white, with a darker blue dash from her forehead to her nose. Not that her humanity, or lack thereof, was in any doubt, but her ears were somewhere between elvin and animal, and an odd headdress splayed out in ribbons behind her head.

"I don't understand," I said, looking around solemnly at the scattered bodies. "What are you trying to tell me?"

But she said nothing.

XxXXxX​

I awoke again, this time more normally, and shook my head to clear it. I made note of what I'd seen, because demigod dreams were never something to be ignored, especially not mine. But if there was something I was supposed to understand from all that, I didn't. Still, from experience, I figured it'd make sense eventually.

When the sun rose and began warming the sea, though, I hitched a ride up top with a crab the size of a small SUV and patted myself off on the beach, with full knowledge now that just a bit passed the shore was a sheer drop. I still felt more than a little awkward in my Bikini Top of Safety, but with the world ending, the world having already ended, I figured discretion was the better part of valor—and earful though my dad was going to be getting about his fashion choices, I could feel the armor protecting me. Still, I wanted an actual shirt, so I boldly braved the forests on the island, looking for some sign of mankind or my fellow Servants. If I couldn't find it here, I'd catch the directions to the next island from the fish and try again until I succeeded. I tried, mostly unconsciously, to connect to the World, because it felt like I was supposed to be—but the connection was faint and delayed. It's like I was trying to speak to someone on Mars or something, like the Earth was worlds away and not just beneath my feet. It felt like I was going to have to figure things out on my own, but what else was new.

As it turned out, I was in luck in one regard, though—I found my way to a village in short order, following some tracks I'd spotted along the way. On the way, I found massive pillars of strange metal, sticking up at seemingly random from the ground, but I didn't know what to do or say about that, so I just let it go. When I reached the tree line just outside the village, I stopped for a moment to observe the locals silently. From the outside, things looked about like what you'd expect from an Ancient Greek village, but something was off. There was a sound, but not really a sound, trilling just above what I could hear, but I could still feel it. The plain clothes everyone around me was wearing were, of course, very different from my own—but I couldn't think of anyone who dressed like I was dressed now, so that was kind of a lost cause, anyway. I thought about testing out some of my new powers, to spare myself the embarrassment, but I didn't want to go making waves just yet.

So, with a deep breath and a sigh, I walked into town.

The reaction wasn't quite what I expected. The town, which had just been going about its business, dropped everything. The people put down what they were carry, they stopped making food, they flat-out threw the clothes they were washing onto the dirt, and rushed towards me in a mob. I tensed for a moment before relaxing, not sensing any hostility from them—and indeed, instead of attacking, they all knelt before me, as if in worship.

Frankly, I'd have been more comfortable if I'd just been attacked.

"Lord Poseidon!" The man I assumed to be in charge said. "You bless us with your presence!"

Okay, I had to stop that right now—that was a legitimately dangerous misunderstanding.

"I'm not Poseidon," I told them firmly. "I'm his son, Percy."

There seemed to be a moment of silently exchanged confusion between the crowd, before one brave soul spoke up.

"Forgive us, Your Holiness—would you be the Lady Perse or the Lord Perses?" He asked, his tone regretful, even grief-stricken, while for me, it took a solid ten seconds to parse those words.

Oh yeah, those guys. I thought. Perse was…one of my dad's sisters-in-law, I think, while Perses was a Titan and the father of Hecate. Both were safer than confusing me for Poseidon, but that was still risky business.

"You can just call me Perseus," I allowed at last, holding back a sigh. The other Perseus was a demigod and from experience, I knew nobody gave a shit what we thought. "You don't have to kneel, either; I just wanted to see if you had any clothes. Maybe some food."

There was a sudden furor amongst the crowd before everyone suddenly clambered up and ran off, shouting out to one enough in such a sudden flood of Greek that it drowned itself out. Only the first speaker, the seeming guy in charge, said a word to me directly.

"Please, Lord Perseus—we will see too it that everything is arranged," he said. "If you would be so kind as to wait in our humble temple, we will give you all the hospitality we can offer."

I was about to say that he didn't need to go that far, when we walked by what must have been the town's tailor and my train of thought was promptly derailed. From the outside, it looked like a house out of a history book, but the inside was something out of a cutting-edge production facility, complete with computer monitors allowing the tailor to control the design. He feed wood, along with some kind of silver liquid, into the machine, and from the other side spun cloth.

To the other side, after what couldn't have been more than a minute or two of walking, returned what looked like four hunters between them, carrying a boar the size of a truck, having seemingly killed it with their clubs and spears. Now that several hundred people weren't talking at once, I could even hear them.

"Truly, the Gods favor us today, Michalis," one said, looking like he was barely out of his teenage years. "I haven't seen such a beast in seventy years! And it was just outside the village!"

"Lady Artemis smiles upon us, Alekos," Michalis said.

I continued to look around, watching as the historically out-of-place normality gave steadily away to more and more disparities, right up until my guide led me into the temple. From the outside, it looked like a normal Greek temple, but the inside looked more like some kind of strange research facility. It looked shockingly advanced, more so than anything I could remember, even up to the time when I died—and that was before alarm bells began ringing in my head. I couldn't tell what it was just from this piece, like I couldn't tell what a jigsaw puzzle would look like just by glancing at a corner piece—but whatever part of a ship this thing had come from, this was the most important part. I could feel my awareness spread through the underside of the island, now that I was standing inside it, the awareness of fifty-seven different damaged systems suddenly filling my head. I could feel a feel a broken subsystem running in the background, trying to reach out to its other pieces, pinging them to try to notify them of errors. Without thinking about it, I rerouted some of the ships remaining power to boost the signal and received a response from the other islands, realizing that they'd all been trying to do the same.

A map formed in my head, the hopping signal lighting the other islands up in my head like stars, and then going up, in a way that had nothing to do with elevation, through a hole in space to a place beyond this one, and then higher still to something an eternity away—

I cut the connection urgently, the moment I thought I felt something take notice, and what's more, returned the damaged ship's systems back to the way they were. At the same time, heart hammering in my chest, I finally looked around, half-expecting someone to suddenly appear, and feeling worryingly sure there was more to that than paranoia. The fish had said my dad was beneath Mount Olympus and suddenly I understood that in a way that I struggled to even begin to explain. Atlantis was beneath Mount Olympus, but all of it was connected. And above Mount Olympus? There was something else.

There was a lab table in this 'Temple,' and I went over to it, just to sit down. A glance at the center of the room was all it took to make it flicker on it.

"Olympian detected," a voice came through on some intercom I couldn't see. "Greetings Planetary Environment Modification Plant-Ship Poseidon. There are fifty-seven units of Theos Kahponomia available. Damage detected…beginning delivery."

What are you saying? I thought, getting more worried and confused by the second, especially when another person had mistaken me for my father. Not even a person, actually—even the machines were doing it. Even so, I said nothing, simply feeling it as the ship began to move, even as mechanical arms rose from the floor and came down from the ceiling, each bearing a container of silver fluid and needles that quickly pressed against my skin. I knew mentally that if they meant me any harm, they'd break on my skin, so I forced myself to be still, and they pressed in slowly without even the slightest bit of pain. While they were still part of the ship, I could feel the fluid moving like it was alive, billions, if not trillions, of tiny machines swarming through them. I knew mentally that they were nanomachines and true, I'd seen some crazy shit from the gods, but even for me, this was weird.

But as they entered my system, I felt like a pain that I hadn't even noticed was gone. I understood what that meant, in exceedingly meaningless technical terms—the 'ambient mana' in this world was exceptionally, staggeringly high, making it easy for a Servant's 'Saint Graph' to maintain itself, but the 'distance' between this World and the one that had summoned us still made it hard for us to function at full power, especially without a 'Master.' That stuff did and didn't mean anything to me, but what I knew for sure is that whatever was wrong, this Theos Kahponomia—this Legacy of the Gods—fixed it. I felt better immediately, like I'd just eaten Ambrosia, and I could feel the powers I'd unconsciously been keeping deactivated slowly turning on as power became available for them, including one in particular.

It was just as meaningless to me as all the other technical terms, especially translating it from ship-talk to the weird, disjointed download the world was intermittently giving me, but apparently, this was a 'pseudo-perpetual motion machine of the second kind' or some shit like that. I don't know, but it was providing me power right now, and that's what matters.

Without meaning to or even thinking about it, I drained the temple dry, taking all fifty-seven units for myself. It could make more, I knew, but it'd be awhile, and I wasn't sure I had that kind of time. In point of fact—

I looked out the doors of the Temple, staring out passed my again-kneeling guide, the village, and even the forest. Out further than I could even see, really, but my senses had spread through this ship and out into the water around it.

And someone was running on top of the sea, heading straight for this island.