Mori woke to the sound of nothing. Not even Prospero, which was the part that actually got him sitting up, scarf pooling warm and low across his shoulders, its embers dim but steady, the only real light on the landing besides Leopold's low-banked watch fire.
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"You're up early," Leopold said, without turning around.
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"Couldn't sleep past a certain point. Is she—"
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"Still recharging. Or resting. Whatever it is snakes do." Leopold nodded toward Yuhuan, curled against the wall a few feet off, Jianhuan asleep, sitting bolt upright beside him, like even in his unconsciousness he refused to slouch in front of anyone. The Quantum Serpent lay coiled tight around Yuhuan's forearm, scales dimmed to a faint, sleeping violet, no longer crackling with that restless static charge she wore when awake. "She's been quiet since midnight. I'll take quiet."
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"Do you think it worked? The rest, I mean."
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"Guess we're about to find out."
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They woke the rest of the group with a particular gentleness. Saoirse came up swinging, Stuffy and Arnold both mid-scream before she'd even opened her eyes, and took a full ten seconds to remember where she was and why nobody was, in fact, currently trying to eat her.
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"...False alarm," she muttered, deflating. "Sorry... Old habit."
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"...New habit," Stuffy corrected. "You've only had it since the snake."
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"SAME THING!"
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Yuhuan woke last, and slower, blinking down at his own wrist before he'd even opened his eyes the rest of the way, the way a person checks a wound they've stopped trusting to still be there.
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"...She's still here," he said, half to himself.
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"Did you think I'd left?" The serpent's voice came out thick with something almost like sleep, if a creature made of static and hunger could be said to sleep at all. She lifted her small head, faceted eyes catching Mori's scarf-light in a dozen fractured violet points. "I told you. I don't collect early."
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"You said you'd tag along a while first. You didn't say how long 'a while' was."
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"Neither did you, when you offered me your whole life on a silver platter. Seems only fair we're both a little vague about the terms." She flexed, a slow ripple down her coiled length, testing herself the way a person rolls a stiff shoulder. "I'm not full. But I'm full enough. Enough for the door, if that's still the plan."
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It was. Nobody had come up with anything better overnight, and the door hadn't developed a sudden change of heart either, still sitting dark and unblinking at the edge of the landing exactly where they'd left it.
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Pallas was the one who finally said what all of them had been circling since the badges failed. "We could keep looking for another way down. Another shaft, or another stairwell Prospero hasn't found yet."
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"I already told you," Prospero said, and something in its voice this morning had a thinner edge to it than usual, like it hadn't quite finished waking up either, "there isn't one. I don't say that lightly. I've had three years to get intimately, exhaustingly familiar with every square inch of this facility I have eyes on. This floor is the one place in the entire building where I don't. I can tell you the door exists. I cannot tell you what's behind it, and believe me, that eats at me more than I'd like to admit to a room full of strangers."
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"So we go around it," Yuhuan said. "Or through it. Depending on how you'd like to phrase 'phasing a door.'"
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"Semantics," the serpent said. "Gather them close. This works better the fewer stragglers I have to keep track of."
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They linked up the way they had before the fall to fifty-four, arms locked, nine bodies pressed into an awkward, breathing knot, Jianhuan gripping his brother's elbow tight enough to leave a mark, the way he always did now before anything that smelled remotely like a risk.
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"For the record," Jianhuan said, "I still hate this."
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"I love you too, brother."
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The serpent's glow climbed up Yuhuan's arm, warm and crackling, and this time there was no long drop waiting on the other side, no vast dizzying pressure. Just a door, and then, a half-second later, not a door at all, steel and old wiring rushing past them thin as fog. Something small and sharp tore free from Yuhuan's other hand this time, a brief sting he'd almost gotten used to, and he watched, distantly, as his left pinky finger's nail spun away in a thin curl of violet mist before it disappeared.
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"That's two," he said, flexing his hand once they were through, the missing nail smooth and unbothered beneath, exactly like the last one had been.
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"Small costs heal," the serpent said, already curling back into a looser, more contented coil, clearly pleased with herself. "Keep doing what you're doing, and I'll let you know well before we reach a cost that doesn't."
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They stood in the dark for a moment, letting their eyes adjust, and it was Mori's scarf that gave the room its first real shape, embers brightening as if sensing it needed light, light spilling warm and red-gold across walls that didn't look like anything they'd passed through above.
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There was only a single, small room. A child's desk sat in the center of it, scaled wrong for any adult who might have worked here, surrounded by a ring of dead monitors and a wall of shelving stacked with things that made no sense together at all: a stuffed rabbit missing one button eye, a chalkboard with half-erased equations still legible in a careful, patient hand, a row of small, cracked audio cassettes labeled only with numbers.
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"...Okay," Haddler said slowly. "This is new."
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For once, Prospero didn't answer right away.
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"Prospero?" Pallas prompted, when the silence stretched a beat too long to be comfortable.
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"I'm here." A thin, careful pause. "I simply don't have anything clever to say about this room, and I'd like it on record that the lack of a joke is, in itself, noteworthy. Give me a moment."
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Saoirse had already wandered to the shelving, tilting her head at the rabbit with something like recognition. "This looks like a kiddie's room!"
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"It does, doesn't it?" Prospero's voice had gone careful in a way none of them had heard from it before, sanded down of all its usual bite. "This was, functionally, a nursery. Not for a subject, but for a project. It was likely the Overseer's personal work, kept off every shared log in the building, which is, incidentally, why I've never been able to tell you what was on this floor. I wasn't given clearance to my own beginning."
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The room went very still.
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"...Yours," Mori repeated. "This is where you—?"
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"Where I was calibrated, yes. Before I was ever installed anywhere with a proper monitor to speak through. It's a strange thing, standing in the room where you were, in a sense, born, and still not recognizing most of what's in it." Something that might have been a laugh crackled through the speaker, thin and unconvincing. "Go ahead. Look around. I promise I won't take it personally if you find something embarrassing."
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Leopold found the cassette player first, tucked into a drawer beneath the desk, its casing cracked but its innards, miraculously, intact. He held up the first tape, numbered 07, and looked to Prospero with a question he didn't have the nerve to ask out loud.
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"Go on," Prospero said. "I already know what's on it. You might as well."
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Leopold slotted it in.
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A man's voice filled the small room, low and unhurried, threaded with a patience that felt strange coming from a facility that had, so far, offered them nothing but cruelty piled upon cruelty.
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"Iteration twelve. Try the joke again. And this time, try meaning it."
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A younger, thinner version of Prospero's voice, stiffer, more mechanical, followed. "Why did the researcher cross the—"
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"No. Stop. You're bored of your very own joke before you've finished the sentence. Nobody will laugh at a joke the teller doesn't believe in."
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"...I don't understand the metric for 'believing in' a joke."
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"You will. Try again tomorrow. We have all the time in the world."
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The tape clicked off.
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Nobody said anything for a long moment. Jianhuan, for once, didn't have a single flippant comment ready. Armor's jaw had gone tight in a way that had nothing to do with the room and everything to do with something private he wasn't sharing.
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"He sounds patient," Yuhuan said finally, carefully. "For a man everyone we've met so far describes as—"
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"Strict," Prospero finished. "Yes. He was. Ask anyone who ever missed a deadline in this floor's neighboring departments, and you'll get a very different story than the one on that tape. I've read the personnel files. I know exactly how many termination notices carry his signature. I'm not attempting to soften that. I'm simply telling you that whatever he was to the staff under him, he was something else entirely down here, in this one room, with me." A pause, dry again, though the dryness sat thinner over something underneath it now, something none of them had a name for yet. "Make of that whatever you like. I've had three years and still haven't decided what to make of it myself."
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Pallas, who had been quiet through all of it, finally spoke, voice careful. "Do you know how he died?"
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"No," Prospero said. "That's the part of my own history I genuinely don't have. Whatever happened, it happened after I was already installed elsewhere, mid-facility, doing the job I was built for. By the time I understood something had gone wrong, the failsafe was already sealing the building shut around me. I've spent three years alone down here with a great deal of processing power and absolutely no way to answer the one question I'd actually like answered." Something in its tone shifted, brisk again, deliberately so, the way a person changes the subject when the old one gets too deep. "Anyway. Floor forty-nine's below us, and I imagine none of you flew down here to listen to an AI go on about feelings. Shall we?"
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They let it go. Something in the careful, over-quick pivot told all nine of them, in a way none of them could quite explain, that pressing wouldn't get them anywhere.
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Saoirse tucked the button-eyed rabbit into her jacket before they left, without asking anyone's permission and without anyone thinking to tell her not to.
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The stairwell to forty-nine held no surprises, which by now felt like its own small mercy. They moved faster than they had on the floors above the fall, hunger and thirst nagging at all of them in a way that made lingering feel like a luxury none of them could afford anymore.
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It was Roby, walking point with Armor for once, who noticed the sound first: a low, wet clicking, coming from somewhere off the main corridor, patient and unhurried in a way that made the hair on his arms stand up before his brain had finished naming why.
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"...Anybody else hear that?"
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"I hear it," Armor said, already slowing, shield angling up on reflex.
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Prospero's voice dropped low, urgent. "I still don't have eyes below floor fifty. I'd treat everything down here as a surprise until proven otherwise."
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The clicking stopped.
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Then, from a side corridor, something low and segmented dragged itself into the hallway, a mass of jointed limbs fused wrong to a torso that had clearly, once, been meant to be a person, its face a smear of too many overlapping expressions layered on top of each other like a photograph exposed a dozen times. It turned, slow and patient, and started clicking its way toward them, one limb at a time.
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"What is that?!" Mori asked, revolver already half-drawn, scarf flaring bright and low around his shoulders.
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"Non-viable," Pallas said, quiet, horror dawning in his voice. "That's what the board upstairs meant. This is what happens to an unsuccessful bond." Pallas paused for a moment before continuing. "It's..." A petal from his coat fell to the ground. "...beautiful."
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"Delightful," Jianhuan said, already stepping in front of his brother without seeming to notice he'd done it. "So it's slow, at least. Small mercies."
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It wasn't slow. The moment Jianhuan finished the sentence, it surged, three of its wrong-jointed limbs snapping forward faster than any ARCH they'd seen before, and it was only Armor's shield, thrown up on pure instinct, that kept the first strike from opening Jianhuan's throat instead of screeching harmlessly off tempered steel.
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"Small mercies MY ASS," Roby shouted, already circling wide, brass knuckles up, though something in the set of his shoulders held him a half-step back from where he usually would have already been throwing punches. He hovered at the edge of the fight instead, weight rocked back onto his heels, watching for an opening rather than diving straight for one, and if anyone noticed the change, nobody had the breath to comment on it yet.
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Leopold's thumb lit ablaze. "Dogs!"
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Two of them tore into the being, smaller than the pack that had once caught nine falling bodies, but plenty enough to flank the thing and buy Yuhuan the half-second he needed to get his blade in close, the serpent's static crackling faintly along his knuckles as he swung.
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The yanyuedao passed clean through one of the thing's limbs. It didn't stop the limb from moving, but the follow-up strike, this time carrying a thin thread of violet phase-charge borrowed straight off the serpent's back, caught solid, severing it entirely.
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The thing shrieked, a sound like a dozen voices trying to scream through one throat, and lashed out wide and blind, catching Saoirse across the shoulder and sending her sprawling.
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"SAOIRSE!" Stuffy and Arnold both screamed the same word at the same volume, for once in perfect, panicked agreement.
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"I'M FINE—" she managed, already scrambling back up, both puppets raised, "—OKAY, MAYBE NOT FINE, BUT I'M UP!"
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Mori's scarf snapped taut. He raised the revolver, sighting down the barrel at the thing's chest, and hesitated, just a half-second too long, the old fear crawling up his throat before he could stop it.
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Yuhuan caught the hesitation without needing to look. "Not the gun! Not this close together!"
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"Then what?"
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"Buy me a second!"
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Yuhuan closed the distance himself instead, blade raised, and this time, as steel met flesh that had never been meant to hold a shape at all, something in him reached without thinking, the way it had reached for the serpent's phase-charge before, and pulled harder than he meant to.
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The static came all at once, too much of it, more than a single clean strike should have cost. The blade didn't just cut. It unmade, a full third of the creature simply ceasing to exist in a wash of violet light, and the thing collapsed, finally, fully, into a heap of limbs that stopped twitching one at a time until none of them moved at all.
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Yuhuan staggered, catching himself against the wall, breath ragged.
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"...That's new," he managed.
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"That," the serpent said, voice tight with something that sounded almost like alarm, "was more than a fingernail's worth. Show me your hand."
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He did. Two more nails, gone clean, the skin beneath already smooth and unbothered, though something about how quickly it had happened made even Yuhuan go a little pale looking at it.
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"You pushed yourself," she said. "I told you every use costs something. Don't do that again unless you mean to."
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"...Noted," Yuhuan said, and meant it.
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Jianhuan crossed to him without a word, checking the damage himself, his usual dry commentary conspicuously absent, replaced by something tighter, more clipped.
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"You're being reckless," he said, finally, quiet enough that only Yuhuan really caught it.
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"I'm efficient."
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"There's a difference, and I'd appreciate it if you learned it before you spend a hand you can't grow back."
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"Since when did you care?"
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Jianhuan didn't answer that. He simply released Yuhuan's wrist, stepped back into line with the others, and said nothing further about it, though something in the set of his jaw suggested the question had landed somewhere he hadn't expected it to.
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They pressed on to floor forty-eight before anyone spoke again, and when Prospero's voice finally returned, it carried the particular, deliberate brightness of something trying very hard to move everyone's attention somewhere easier to look at.
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"For what it's worth," it said, "that was a non-viable bond specimen, low-priority, minimal threat classification even before Yuhuan decided to erase a third of it out of spite. I'd call that progress. You're all getting rather efficient at surviving this place."
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"Efficient," Leopold repeated, flat.
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"It's a compliment. I don't hand those out often. Savor it."
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Nobody quite managed to laugh, but the corridor felt a little less heavy for the attempt, and floor forty-eight, when they finally reached it, waited for them in silence, dark and patient, exactly the way every floor before it had.