Sometimes they are five. Sometimes they are three.
We do not merely destroy our enemies;
we change them.
WELCOME TO THE END OF TIME.
The Regency has its spies and its cloaks and daggers. You may have even brushed shoulders with one and not have known it. There is a place for such tactics. You are not in that place any longer.

On missions like these, the Regency prefers to keep its base close, in a intradimensional time pocket. You're apart from Gallipoli, no longer technically on Earth or in the 1910s. There are multiple segments to this complex base of Regency operations, but you can only really see two places...
THE BRIG
This is your holding cell, a constantly shifting room of indesctructable grey squares. It folds and bends to hold you and your seven companions as you await... something.
There are no guards in this place. There are no bars to look through, or sounds to listen for. You are simply in the box, left to your own devices.
Occasionally, holes will open in the ceiling, and packaged, processed rations will fall from them before immediately closing. This is the only way to measure time. There are always exactly eight bags, each with the name of one captive written on the side in their native language.
Holes will occasionally open in the walls, and they always bring with them a searingly bright light. Sleeping and sitting is difficult on the ever-shifting floors, and when you try, it always seems like a pinhole of light opens right on your eyes. Even leaning on the walls has mixed results.
DON'T GO TOWARDS THE LIGHT
The windows of light that open always stay very small, making it difficult to look through, and always pour radiantly bright, hot light. If you're feeling particularly self-punishing, you might be able to peek at an odd angle and see something of the world outside without being completely flashblinded. The world outside the Brig looks rather like the interior of a Dyson sphere. In the center, a great, bright, hot energy radiates out like a sun, and it reflects off the exterior globe the pocket dimension functions within, illuminating everything from every angle. The Brig floats around it in a slow orbit, as do many other similar looking box-rooms made of similar material, connected by constantly moving tubes and chutes. Some boxes have more chutes going toward them than others. No chutes connect to the Brig, unless someone is about to disappear into the floor...
Getting this view will be difficult, but not impossible; it will just take characters willing to blind themselves with an overabundance of light multiple times until they get the correct angle, allowing them to see outside for roughly a half second before the room shifts to redirect the light back into their eyes.
not so solitary confinement
Occasionally, the cube will split into smaller segments, throwing characters together with others at random in close confinement. This is unpredictable and fast, splitting you off from the whole for what feels like hours at a time, often with only one companion as the cube shifts and squirms around you.
technical malfunction
The power nullification is still in full effect. No magic or special abilities rule this place. Your only master are the walls, undulating with no discernible pattern, always moving.
The Regency has also attempted to break the BCE's translation capabilities, but due to the fact that COST-jailbroken BCEs work on a different system than Regency ones, this is an intermittent problem that occurs sporadically. (ie, have the translation capabilities blink in and out at your discretion.)
THE OTHER PLACE
And then, suddenly, the floor drops out from underneath you. The shifting walls make a hole perfectly your shape and size, and sucks you through. The hole closes neatly, immediately, and you slide along in a world of boxes pressing close to your skin as you are moved from one holding area to another.
When you emerge, you do so in total darkness. Power nullification is still in effect, but even if you can naturally see in the dark, it doesn't matter. All you can see is an endless blackness, and walking doesn't help. You can keep walking for however long; there is nothing to walk to. The floor is perfectly level, but you'll never reach a wall.
Finally, there's light in the distance. A spotlight from nowhere shines down on a person with the head of a jackal. Looking closer, you'll find it's some kind of highly technical mask. They are wearing armor that obscures their exact shape-- no skin shows, no hint of identity or personality, just the cold eyes of the mask. They turn to you, and speak in a voice clear and soothing, almost gentle.
"I am Kebechet. I have been looking forward to speaking with you."
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"We don't know what's useful and what isn't, yet. Could be... to one of us, or later. Why, did you see out there already?"
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"If you actually saw something else, tell me." He's right that it could come in handy later. "I'll help look."
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"... I saw the outline of something. Just something rounded, like a downward-facing curve. Not sure what else."
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What was that about infighting? Mordred looks through the nearest hole that opens, swears, then pulls back, rubbing at her eyes.
"Okay. Maybe there is something there." 'Something' isn't just her being vague; she has no idea what she's looking at, even without the searing brightness. "But whatever it is, it's too damn bright. They should tone it down a bit." Yeah, okay.
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He even reaches out his hand when she appears to be in pain, stopping just short of actually touching her. "Yeah, yeah, they should, but I don't think they're about to. We have to deal with this on our own; I don't think they're gonna' cut us any slack."
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The light? Having to work together with others? Everything? Probably everything.
"Besides, it's weird that we'd see anything. What the hell kind of prison is this?" She's not actually expecting him to know; just venting her frustration. The Holy Grail gave her knowledge of the modern era, so she wouldn't be completely lost — being out of her depth completely is a new experience for her. "Just thinking about it gives me a headache."
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"I'm gonna' give it another go, okay? We can trade off." And sure enough he's punishing himself again with another peer outside, eyes narrowed with a near wince as he tries to pick out any defining features before the light grows too painful and he's forced to jerk back again.
"Fuck... Okay... I couldn't see the curve this time but there was definitely something else floating out there."
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"Okay. I'll look again." And she does, pressing her eye to the next hole that opens. It doesn't work the first time, but she pulls back and tries, tries again, until she finds the right angle for that split second. When she pulls away, she gives Noctis a nod, then hesitates before speaking. "Whatever that crap is, it just looks like more boxes."
'Do they have more cells?' is the question she doesn't ask. Rey was the only one she was with, when they got taken. For all she knows, everyone else is stuck here too, in their own floating hell of boredom. The thought isn't a pleasant one, and she shakes her head as if to forcibly dismiss it.
"Forget it. If more of us were here, we'd know about it by now."
It'd be a prime advantage — almost all of them have some sort of attachment to others in COST. Knowing Ryuji probably got away is one of the few things that makes being here tolerable. Why wouldn't they use that to try and break her?
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"... yeah. You're right. Even if our magic's getting messed with I bet I'd be able to feel Achilles if he were close by. It's just a couple of us that they got." Prompto's safe... Ryuji's safe, Hei is safe, Angel is safe, and so is Midnighter. He can't allow himself to think otherwise.
"They messed up, though, picking some of the toughest people. We should be able to figure out a way out of this. I'm not getting used to slow anyone else down."
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It irks her, being the only Servant captured. Better her than him — that's her duty, after all — but she can't protect him while she's here. Even without the Regency... Gallipoli is a war. A war unlike even the one she fought in. (But then, being trapped this cell is a different kind of battle.)
"We'll show them how strong we are once we bust outta here." Posturing or not, it seems to boost her mood a little. She even manages a grin. "A surprise attack from the inside. There's no way they can guard against that."
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"Just means we have to work together better than they work together, right? Pretty sure we can all manage that..." A pause. "Maybe not Kyle but I think he's got some other stuff on his mind. Rey's cool, and so are Ashitaka and-- uh, the blonde woman."
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Mordred? Petty? Nah. She can agree with the rest of it, though; if nothing else, she's gotten stuck with a mostly decent group. It keeps her at least slightly cooperative, rather than sullen or just plain antagonistic.
"Sooner or later, we'll figure it out." All they need is time, and they have plenty of that. The Regency clearly isn't planning on killing them... at least not yet. "They'll pay for treating me like this. These conditions are unbearable."
And for capturing everyone else, she guesses. But she'd rather whine for a bit.
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"Calling them unbearable means you're not gonna' have a word for it when they really do become unbearable, you know..." Hm. "... I dunno how well brute force is gonna' work when we can't even use our magic. At least I can't; I don't know about anybody else. And it's hard to try to make an appeal to them when we don't know who we're dealing with yet, specifically."
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So much for no insults. Of course she'll change her tune once Kebechet comes along, but even then — she'd prefer to face her opponents, no matter the pain and suffering involved, than just... wait. And wait. And wait. She huffs out a sigh much more obvious than Noctis'.
"I'm strong no matter what." Not as strong, but strong. She was a calamity on the battlefield long before she became a Servant. "They'll screw up eventually. Maybe they'll move us, or try to talk to us. I'll beat them down the moment they show themselves."
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"... okay look, that's a good idea, alright? So we should work together on it."
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And it's their job to get out. Nevermind the fury she'd feel if Ryuji was taken instead; or, honestly, if any of the others were taken in her place. She's grown unexpectedly attached to the whole cell without even realizing it.
"I don't normally work with people." She was working with a team right before she got caught... look, just ignore most of what she says. "But it's the responsibility of a king to look after others. And freedom is a worthy enough prize to fight for."
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"... yeah, you're right. That's the responsibility of a king, so you and I should agree to keep an eye on everybody. We have a duty to everyone else." Somehow it brings him a sense of perspective and he feels he owes her for that.
"If someone comes in here, one of us should focus on distracting them while the other makes a move."
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"I'll fight." If anything goes wrong, that's who they'll blame. She'll say it was all her idea; she's angry and hateful enough that it should be believable. "Distract them with a bad joke or something. Looking at you, I'm sure you can think of one."
Rude... but she says it more nicely than before. Maybe this is just how she shows affection. (It is.)