The air changed first.

  Elias noticed it as they climbed the transition stairs between Floor 2 and Floor 3—a sharpening in the atmosphere, an acrid bite that caught in his throat and made his eyes water. The Skin Flats had smelled of copper and meat, organic but tolerable. This was something else entirely. This was chemical.

  "Daddy, it hurts to breathe."

  Lira flickered beside him, her form destabilizing with each step upward. She didn't need to breathe—not technically—but the memory of breathing was woven into her existence, and whatever corrosive element saturated the air was affecting her manifestation.

  "Shallow breaths," Elias said, pulling his shirt up over his nose and mouth. "Don't take in more than you need."

  The stairs ended in a membrane—thicker than the one at the Tower's entrance, yellowed and opaque like infected tissue. Elias pushed through it and found himself in a world that bore no resemblance to the floors below.

  The Pore Tunnels.

  Gone were the open expanses of the Skin Flats and the cratered terrain of Floor 2. Here, the Tower's flesh had folded in on itself, creating a labyrinth of narrow passages that wound through the organic structure like capillaries through tissue. The walls glistened with moisture—not blood, but something thinner, more caustic. Where droplets fell to the floor, they hissed and smoked against the keratin surface.

  FLOOR 3: THE PORE TUNNELS

  AMBIENT THREAT LEVEL: HIGH

  ENVIRONMENTAL HAZARD: Acidic secretions (contact causes tissue damage)

  PRIMARY FAUNA: PORE CRAWLER

  NOTE: Visibility limited. Sound carries. Stealth recommended.

  "I don't like this place." Lira had dimmed herself to near-invisibility, her instincts—or whatever ghosts had instead of instincts—telling her that light was dangerous here. "It feels wrong. More wrong than before."

  Elias agreed, though he didn't say so. The tunnels pressed close on every side, the ceiling low enough that he had to duck in places, the walls near enough to brush his shoulders. Claustrophobia wasn't something he'd ever suffered from, but the Pore Tunnels tested that resilience with every step.

  The floor was treacherous—slick with secretions, pocked with small holes that might have been drainage vents or might have been something worse. He moved carefully, testing each step before committing his weight, his spear held close to avoid scraping against the walls.

  Light came from bioluminescent nodes embedded in the tissue at irregular intervals, casting everything in a sickly yellow-green glow. The illumination was just enough to see by, but it created shadows that moved and shifted in ways that made Elias's combat instincts scream.

  Vitality: 100/100

  Full health, but that could change quickly in an environment like this. One wrong step, one splash of acid, one encounter with whatever "Pore Crawlers" were, and he'd be fighting for survival with compromised resources.

  They moved deeper into the tunnels.

  The passages branched and reconnected in patterns that seemed almost deliberately confusing—a maze designed by something that didn't think the way humans thought. Elias tried to maintain a mental map, tracking their progress by the position of the bioluminescent nodes, but after the first hour, he had to admit that he was navigating by instinct more than knowledge.

  "Do you hear that?" Lira's whisper was barely audible, even to him.

  Elias stopped, listening. At first, there was nothing—just the drip of acid and the distant pulse of the Tower's heartbeat. Then, slowly, he became aware of another sound.

  Clicking.

  It came from ahead of them—or maybe from the side; the tunnel acoustics made direction difficult to judge. A rhythmic, chitinous sound, like mandibles scraping together. Like something hungry testing the air for prey.

  He pressed himself against the wall, gesturing for Lira to dim herself further. She complied, fading until she was little more than a suggestion of presence.

  The clicking grew louder.

  Elias saw the first Pore Crawler thirty seconds later, and he understood immediately why the System had recommended stealth.

  It emerged from a side passage with horrible fluidity—a creature the size of a large dog, but built nothing like one. Its body was segmented, armored in overlapping plates of the same keratin that made up the tunnel floors. Six legs propelled it forward in a scuttling motion that was somehow both mechanical and organic. Its head—if it could be called a head—was dominated by mandibles the length of Elias's forearm, curved and serrated, designed for cutting through flesh.

  But worst of all were the eyes.

  Dozens of them, clustered across the creature's face like blisters, each one reflecting the bioluminescent light with cold, alien intelligence. They swiveled independently, scanning the tunnel in all directions at once.

  THREAT DETECTED

  CLASSIFICATION: PORE CRAWLER (SCOUT)

  THREAT LEVEL: MODERATE (INDIVIDUAL) / HIGH (SWARM)

  NOTE: Pore Crawlers communicate through pheromones. Killing one may attract others.

  The Crawler paused at the intersection, mandibles clicking as it tasted the air. Elias held his breath, pressing deeper into the shadows, praying that the creature's many eyes couldn't penetrate the darkness where he hid.

  It turned toward him.

  For one terrible moment, Elias was certain it had seen him. Those compound eyes seemed to focus, those mandibles spreading wide in what might have been anticipation. He felt his muscles tense, preparing to fight, preparing to—

  The Crawler turned away.

  It scuttled down the opposite passage, the clicking of its legs fading into the distance, and Elias allowed himself to breathe again.

  "It didn't see us," Lira whispered, relief evident in her flickering form. "We were lucky."

  "That wasn't luck." Elias's mind was racing, processing what he'd observed. "It's hunting by scent and vibration, not sight. Those eyes are for detecting movement, not detail."

  "So if we stay still..."

  "It's not that simple. We're moving through its territory. Eventually, we'll make a sound it can hear or leave a scent trail it can follow." He looked down the tunnel where the Crawler had disappeared. "We need to be smart about this. Fast when we can be, silent when we can't."

  "What about fighting?"

  "Last resort." He thought about the System's warning—killing one might attract others. In an enclosed space like this, swarmed by creatures with those mandibles... "We kill what we have to and avoid the rest."

  They continued through the tunnels, moving with exaggerated care. Elias counted the Crawlers they encountered—one more scout, then a pair moving together, then a larger group of five clustered around something that might have been food or might have been a nest. Each time, they waited, watched, and found alternate routes.

  The fifth encounter was unavoidable.

  The tunnel narrowed to a chokepoint—a section where the walls pressed so close together that Elias had to turn sideways to pass. On the other side, two Crawlers blocked the only forward path, their bodies filling the passage completely.

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  There was no way around.

  "Daddy," Lira breathed. "What do we do?"

  Elias assessed the situation. The Crawlers were stationary—resting, maybe, or standing guard. Their mandibles were folded against their bodies, their many eyes half-lidded in something that looked almost like sleep. If he was fast enough, precise enough, he might be able to kill them before they could sound an alarm.

  If.

  "Stay here," he whispered. "Don't move until I signal."

  He approached the chokepoint with his spear held low, every step measured, every breath controlled. The tunnel's acoustics worked against him—the slightest sound would echo, would carry, would announce his presence to every Crawler in range.

  Ten feet. Five. Three.

  He could smell them now—a musty, chemical odor, like formaldehyde mixed with something rotten. Their armored bodies rose and fell with slow, rhythmic breaths. Definitely sleeping, or whatever passed for sleep among creatures like this.

  Elias struck.

  The spear punched through the first Crawler's head-segment before it could react, the scalpel-blade finding the gap between armor plates with surgical precision. The creature spasmed once and went still, its death almost silent.

  The second Crawler woke.

  It lunged at him with mandibles spread wide, a screech building in its throat—a screech that would bring every Crawler in the tunnels down on them. Elias twisted aside, letting the mandibles snap closed on empty air, and drove his knife into the creature's compound eyes.

  It thrashed, blind and dying, and he grabbed its head-segment with both hands and wrenched.

  The screech died before it could fully form.

  The Crawler collapsed, joining its companion on the tunnel floor, and Elias stood over them both with blood on his hands and acid burns forming where their fluids had splashed his skin.

  Vitality: 92/100

  HARVESTING AVAILABLE

  DECEASED TARGETS: 2

  ESTIMATED YIELD: 0.6 L

  He harvested quickly, ignoring the way the creatures' blood hissed against his knife, ignoring the way their bodies twitched even in death. Every second spent here was a second that other Crawlers might investigate the interrupted screech.

  "Clear," he called to Lira. "Move fast."

  They squeezed through the chokepoint and kept moving, leaving the corpses behind.

  The tunnels seemed endless.

  They passed through sections where the acid dripped so heavily that Elias had to cover himself with strips torn from his own clothing, accepting the damage to his gear in exchange for protecting his skin. They navigated chambers where the walls pulsed with visible capillaries, blood flowing just beneath the surface like rivers of red wine. They avoided three more groups of Crawlers, slipping past in silence, never staying still long enough to be caught.

  Elias's vitality drained slowly—a point here, a point there, accumulated damage from acid burns and exertion and the constant stress of moving through hostile territory. By the time they reached the transition to Floor 4, he was feeling it.

  Vitality: 81/100

  Floor 4 was more of the same—tunnels and acid and the ever-present clicking of Crawlers in the distance—but the passages were slightly wider here, the air slightly less corrosive. Small mercies in a place that offered few.

  They'd been moving for what felt like hours when Lira stopped.

  "Daddy." Her voice was strange—not frightened, exactly, but alert. Focused. "Someone's here."

  Elias froze, scanning the tunnel ahead. At first, he saw nothing—just more walls, more acid drip, more shadows. Then his eyes adjusted, and he noticed the irregularity.

  A crevice in the wall. Small, barely wide enough for a person. And from within it, the sound of labored breathing.

  He approached with his spear raised, every sense on alert. The crevice was dark, the bioluminescent light not quite reaching its depths, but as he drew closer, he could make out a shape. A human shape.

  A woman.

  She was wedged into the narrow space with her back against the wall and her legs drawn up to her chest, trying to make herself as small as possible. Blood stained her clothing—a lot of it, dried brown in some places, still glistening red in others. Her face was pale, sheened with sweat, and her eyes were fixed on him with the desperate intensity of a cornered animal.

  She held a knife.

  It wasn't much of a weapon—a survival blade, maybe four inches long, its edge dulled from use—but she gripped it like she knew how to use it, like she was willing to do whatever it took to keep breathing.

  "Stay back." Her voice was hoarse, cracked from dehydration and pain. "I'll cut you. I swear I'll cut you."

  Elias stopped, keeping his spear low and non-threatening. "I'm not here to hurt you."

  "That's what they all say."

  "I'm serious. Look—" He took a slow step back, creating more distance between them. "I'm putting space between us. If I wanted to hurt you, I wouldn't do that."

  She didn't lower the knife, but some of the wild tension left her shoulders. "What do you want?"

  "I heard your breathing. Came to investigate." He studied her visible injuries—the blood, the way she held her left arm tight against her body, the swelling along her ribs. "You're hurt."

  "No shit."

  "I can help. I'm a doctor."

  Her laugh was bitter, edged with pain. "A doctor. In here. Sure."

  "Surgeon, actually. Combat medic before that." He met her eyes steadily. "I know what internal bleeding looks like. I know what broken ribs sound like. And I know that if you don't get treatment soon, you're going to die in this crevice."

  For a long moment, she just stared at him, knife still raised, calculation warring with desperation in her eyes. He could see her weighing the options—trust a stranger and maybe survive, or maintain her defenses and definitely die.

  "Why would you help me?"

  It was a fair question. In the Tower, kindness was a liability. Resources spent on strangers were resources unavailable for yourself.

  "Because I can," Elias said simply. "And because I used to believe that meant something."

  The knife wavered.

  "I'm going to approach slowly," he continued. "I'm going to examine your injuries. If at any point you want me to stop, say so, and I'll back off. But you need help, and I'm offering. That's all this is."

  She stared at him for another long moment. Then, slowly, she lowered the knife.

  "Fine. But if you try anything—"

  "You'll cut me. I know."

  He moved forward carefully, telegraphing every motion, giving her time to adjust to his presence. Up close, her injuries were worse than he'd estimated. The blood on her clothing came from multiple sources—a deep gash along her shoulder, a puncture wound in her side, and the internal damage he'd suspected from the way she held herself.

  "What's your name?" he asked, gently probing the wound on her side. She hissed but didn't pull away.

  "Mira."

  "I'm Elias. This is going to hurt."

  He examined her methodically, falling into the clinical detachment that had carried him through a thousand surgeries. The shoulder wound was ugly but superficial—muscle damage, no arterial involvement. The puncture wound was more concerning; it had missed her kidney by millimeters, and the surrounding tissue was hot with early infection.

  The ribs were the real problem.

  "Two broken, possibly three," he said, keeping his voice neutral. "You've got fluid building in your chest cavity. If I don't drain it, you'll suffocate within hours."

  Mira closed her eyes. "That bad?"

  "That fixable. With the right tools." He unshouldered his pack and began extracting supplies—the medical kit from his bunker, carefully rationed and preserved for exactly this kind of situation. "I'm going to need to make an incision. Insert a tube. Let the fluid drain."

  "That sounds terrible."

  "It's going to feel worse. But you'll live."

  He worked quickly, efficiently, his hands finding the muscle memory of countless procedures performed under worse conditions. The Tower didn't have operating rooms or sterile fields or proper anesthesia, but it did have something the old world hadn't: a System that accelerated healing once the immediate damage was addressed.

  He cut. He drained. He stitched.

  Mira endured it with clenched teeth and white knuckles, occasional gasps escaping her control but no screaming, no panic. Whoever she was, she was used to pain. That told him something about her history—nothing good, probably, but useful.

  "You've done this before," she said when he finally sat back, the tube in her side dripping dark fluid into a makeshift container. "Field surgery."

  "More times than I want to remember."

  "Where?"

  "Afghanistan. Syria. The Bleed." He cleaned his instruments with methodical care. "After a while, the location stops mattering. Just the work."

  "You don't seem like the type."

  "What type is that?"

  "The type who climbs the Tower." She watched him with eyes that were sharp despite the pain. "Climbers are desperate. Crazy. Running toward something or away from something. You're too... calm."

  "Calm doesn't mean I'm not desperate."

  She accepted this with a small nod. "Fair enough. Why, then? Why are you here?"

  It was the question everyone asked eventually. The Tower attracted the broken, the grieving, the ones with nothing left to lose. Every Climber had a reason, and every reason was a wound.

  Elias considered lying. Considered deflecting. Considered all the ways he could avoid answering.

  Instead, he said: "Lira."

  "Who's Lira?"

  "My daughter." He turned toward the shadows of the tunnel. "You can come out now, sweetheart."

  Mira's expression shifted—confusion, suspicion, the beginning of fear. "There's no one there."

  And then Lira stepped into the light.

  She emerged from the darkness hesitantly, her translucent form flickering with uncertainty. The bioluminescent glow passed through her, casting strange shadows, making her look even less real than usual. Her eyes—too blue, too bright—fixed on Mira with childish curiosity.

  "Hello," she said. "I'm Lira."

  Mira didn't respond.

  She stared at the ghost—at the impossible apparition of a child hovering in the tunnel, at the father who watched his dead daughter with grief and love and desperate hope in equal measure. Her face went through a dozen expressions in the space of a breath: shock, disbelief, horror, understanding, and finally something that might have been recognition.

  "A Foundling," she whispered.

  "Yes."

  "You're climbing for her."

  "Yes."

  Mira looked from Lira to Elias, from the ghost to the surgeon who'd just saved her life. Whatever calculation she was running, whatever assessment she was making of this strange pair, she kept it to herself.

  She said nothing.

  The silence stretched between them—Elias and his dead daughter and the woman whose life he'd just pulled back from the edge—and the Tower pulsed around them, patient and hungry, waiting to see what they would become.

  "We should move," Elias said finally. "The Crawlers will find us if we stay still too long. Can you walk?"

  Mira tested her weight, wincing but holding. "I can walk."

  "Then we go together. Strength in numbers." He held out his hand. "Truce?"

  She looked at his hand like it might bite her. Then she looked at Lira, still flickering in the tunnel's strange light, still watching her with those too-blue eyes.

  "Truce," she said, and took it.

  They moved deeper into Floor 4, the doctor, the wounded woman, and the ghost—three broken things bound together by circumstance and survival and the faint, desperate hope that the Tower might give back what it had taken.

  Mira didn't speak again for a long time. But every few minutes, Elias caught her glancing at Lira with an expression he couldn't quite read.

  Something like grief.

  Something like memory.

  Something like fear.