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Kael pushed the blue tarp aside and stepped back onto the concourse.
The seventy people huddled beneath the flickering platform signs were watching him. They didn't have weapons, and they didn't have training, but they had eyes. They had seen the violet light pulsing through the canvas of his coat before he went behind the partition, and they had seen him come out without his torn jacket, wearing only a black undershirt and his combat rig.
The man with the gold chain was standing five paces back, his arms crossed over his chest, but his posture was different. His shoulders were hunched forward, tight with tension.
"What's coming?" the man asked. He didn't yell this time. His voice was lower, raspy from dry air and lack of sleep.
"Water-dwellers," Kael said, stopping in the center of the concourse. "Things that lived in the silt of the Han River before the sluice gates backed up. The excavator we killed below cleared four miles of blocked culvert. The water drained out into the lower basin, which means the dry pipe is now an open highway directly into this station."
The concourse went dead. A woman clutching a child wrapped in a wool blanket let out a stifled sob.
"How many?" Park asked, stepping forward with his galvanized pipe held in both hands.
"A pack," Kael said. "Maybe twenty. Maybe forty. They won't be as big as the excavator, but they'll be faster than the hounds from the supermarket. Their hides will be slick, which means cutting edges will slip off their flanks if you don't strike at ninety-degree angles. Stabs, not slashes. Blunt force to the skull, not the torso."
The man with the gold chain let out a dry, rattling breath. "We can't fight forty of those things. Look at us. We've got two pipes, three kitchen knives, and a dozen broken broom handles."
"You're not fighting forty," Kael said, his dark eyes locking onto the man's face. "I am. Min-Jae is. You are going to hold the secondary gate."
"What's your name?" Kael asked.
The man blinked, taken aback. "Bae. Jin-Hyuk."
"Jin-Hyuk. You used to manage people before this, didn't you?"
"I ran two karaoke bars and a private loan office in Yeouido," Jin-Hyuk muttered.
"Then you know how to organize men who don't want to do what they're told," Kael said. "Take six of the biggest men who aren't currently guarding their children. Go to the maintenance room at the north end of Platform 1. There are four heavy steel fire barriers rolled up into the ceiling recesses. Find the manual chain hoists. You pull the chains until the iron slats drop to waist level. You do not weld them shut. You do not lock them down. You leave a three-foot gap at the bottom."
Jin-Hyuk frowned, his forehead wrinkling. "Why leave a gap? If we drop them all the way, it blocks the entire corridor."
"If you drop them all the way, they pile against the metal, their combined weight buckles the track pins, and sixty of them spill into this room at once while you have your backs turned," Kael explained, his voice even and instructional. "If you leave a three-foot gap, they have to crawl on their bellies to get under the iron. When an animal crawls on its stomach, its cervical spine is parallel to the floor, its eyes are looking down, and its jaw is pinned against the concrete."
Jin-Hyuk's eyes widened slightly as the geometry of the tactic clicked into place. "They can't bite while they're crawling."
"They can't bite, and they can't leap," Kael said. "You put two men on each side of the gap with crowbars. As soon as a snout comes under the metal, you drive the iron into the back of the neck. You don't try to be heroes. You don't look at their faces. You just hit the joint between the skull and the spine like you're driving a tent stake into hard dirt."
Jin-Hyuk swallowed hard, his Adam's apple bobbing above his tarnished gold chain. He looked back at the cluster of frightened office workers and shop clerks sitting by the ticket booths, then turned back to Kael.
"What if one gets through the gap?" Jin-Hyuk asked.
"Then the men behind you use the fire axes to finish it before it stands up," Kael replied. "And if you break your line, Min-Jae and I won't have a rear to retreat to when we fall back from the lower tunnel."
Jin-Hyuk stood there for three seconds, his jaw working silently. Then he nodded once, a sharp, nervous jerk of his chin.
"Hey," Jin-Hyuk barked, turning toward three men who were sitting near the dead vending machines. "You three. Get up. You heard him. Move your legs before I drag you by your shirts."
Kael didn't watch them go. He turned toward the southern stairwell where Min-Jae was already waiting, the aluminum bat resting across his shoulders like a yoke.
"How are the hands?" Kael asked, walking up the steps.
Min-Jae opened and closed his right palm. The newly formed skin was pink, smooth, and slightly shiny under the yellow emergency light, but there was no trembling.
"They feel cold," Min-Jae said quietly. "Like I've been holding an ice pack for three hours. But they don't hurt. The grip feels... heavier."
"That's the residual energy from Yuna's healing. It forces the cellular matrix to compress tighter than normal tissue. It will feel stiff until your core circulates enough blood to match the density."
Min-Jae looked down at the dark mouth of the southern service stairwell. "Hyung. When that centipede dropped earlier... I thought my ribs were going to cave in just from the wind of it."
"Your ribs didn't cave in," Kael said, drawing his carbon-steel tanto from its sheath and checking the edge with his thumb. "And you didn't drop the bar."
"I wanted to," Min-Jae admitted, his voice barely louder than the hum of the transformer above them. "My legs felt like water. When it shrieked, I couldn't see straight for five seconds. I thought about dropping the crowbar and running back up to Miss Yuna."
"Why didn't you?"
Min-Jae looked at his sneakers, then up at Kael. "Because you were standing directly under its mouth, holding a four-inch blade, and you didn't even blink. I figured if the guy with the knife wasn't running, the guy with the crowbar looked like an idiot if he took off."
A faint, dry twitch pulled at the corner of Kael's mouth—the closest thing to a smile he had shown in four days.
"That's called tactical anchor," Kael said. "In a firefight, ninety percent of men don't shoot because they want to kill the enemy. They shoot because the man next to them is shooting, and they'd rather die than let him see them crawl under a truck. Use it. When you feel your knees shaking, look at my back. As long as my shoulders are squared, you stay in your stance."
"And if your shoulders drop?"
"Then you swing the bat as hard as you can at whatever is standing over me," Kael said, stepping through the fire door into the stairwell. "Because if I go down, you have about four seconds before it turns around to eat you."
---
They took their position at the junction sixty yards south of the concourse, right where the narrow service tunnel widened into the vaulted brick drainage line.
The air had changed again.
The chemical sulfur reek of the excavator had washed away, replaced by the suffocating, organic rot of river bottom. It smelled of stagnant pond weed, dead carp, industrial chemical runoff, and wet, decaying silt.
From the darkness of the lower culvert, the sound was no longer rhythmic thuds.
It was a wet, chaotic chorus of slithering, skittering clicks.
*Clack-clack-clack-clack.*
Webbed claws with long, needle-like talons scraping frantically against the damp brick floor. Hundreds of individual impacts echoing up the curved tube, overlapping until it sounded like a flash flood tearing through a gravel bed.
"Min-Jae," Kael said, dropping into a low, forward-weighted stance. His right hand held the heavy tanto in a reverse grip; his left held a standard eight-inch drop-point combat knife.
"I'm ready," the boy whispered. He stood two paces to Kael's left, the aluminum bat raised near his right ear, his elbows tucked tight, his cleats dug into the ballast stones between the rails.
"Let the first three past the threshold," Kael said, his voice dropping into the icy, mechanical cadence of a man clearing a breach room. "They'll be blinded by the transition from total darkness to the ambient light of the junction. When their eyes contract, they'll hesitate for half a second. That's your window. Don't aim for the back. Hit them right where the neck joins the skull."
The first creature burst out of the culvert mouth.
It wasn't a hound, and it wasn't an insect.
It was a grotesque, mutated amphibian the size of a large mastiff. Its skin was translucent, grayish-blue, covered in a thick layer of glistening, viscous slime that dripped from its flanks in long, rubbery strings. It had no neck; its wide, flattened head merged directly into a powerful, muscular torso supported by four splayed, webbed legs tipped with three-inch black talons.
Its eyes were milky, white spheres without pupils, and its mouth was an immense, horizontal maw lined with four rows of needle-like, backward-curving translucent teeth.
As it hit the junction floor, its milky eyes caught the faint, dusty yellow reflection of the distant halogen lamps. It hissed—a wet, bubbling sound like water boiling in a clogged pipe—and paused, its claws skidding on the slick concrete.
"Now," Kael murmured.
Min-Jae stepped forward with the full rotational torque of his hips.
*CRACK.*
The aluminum barrel struck the side of the creature's skull with a sound like a wooden plank snapping in two. The beast's head caved inward with a sickening crunch of cartilage and fluid; the sheer kinetic force flipped its hundred-pound body sideways, slamming it into the brick pillar where it twitched twice and lay still, black, watery fluid pooling from its ruptured eye sockets.
Before Min-Jae could recover his stance, three more burst through the archway in a tangled, thrashing mass of blue skin and snapping jaws.
One lunged directly for Min-Jae's throat, its webbed feet pushing off the ballast stones with explosive speed.
Kael didn't wait for it to land.
He stepped inside the beast's attack arc, his left forearm driving upward to catch the underside of its jaw.
*BANG.*
The creature's heavy, slimy jaw snapped shut on empty air an inch from Kael's ear. With his right hand, Kael drove the carbon-steel tanto straight up through the soft, fleshy palate beneath the lower jaw, punching through the roof of the mouth and burying the four-inch blade directly into the brain cavity.
The beast went rigid instantly.
Kael didn't pull the knife out. He used the embedded blade as a lever, spinning his entire upper body and hurling the hundred-pound carcass directly into the chest of the second charging creature.
The two bodies collided with a wet *thud*, tangling in the shallow drainage ditch.
The third river-stalker veered toward Kael's flank, its four rows of needle teeth opening wide, snapping toward his exposed thigh.
Kael's newly adapted reflexes fired before his conscious thought caught up.
The enhanced bone density and thickened muscle tissue in his legs allowed him to pivot on his left heel with terrifying speed. He brought his right combat boot down like an executioner's axe, driving the heavy rubber heel straight onto the creature's snout as it lunged.
*CRUNCH.*
The beast's upper jaw was driven into the concrete track bed, the needle teeth shattering like glass. Kael drove his left blade down into the base of its skull, twisted the hilt ninety degrees, and tore the knife free in a single, fluid motion.
"Hyung! Two more on the left wall!" Min-Jae shouted, swinging his bat in a tight, defensive arc that clipped a charging stalker across the snout, sending it skidding across the wet tiles.
"Hold the center!" Kael ordered, his breath coming in steady, controlled bursts. "Don't let them flank into the service stairs!"
More poured out of the culvert.
The narrow tunnel mouth became a slaughterhouse.
The air grew so thick with the smell of boiled river silt, sulfur, and hot, metallic blood that Min-Jae had to breathe through his teeth to keep from gagging. The floor became dangerously slick, coated in a layer of clear, acidic slime and thick, black blood that hissed faintly as it trickled into the ballast stones.
Min-Jae fought with mechanical desperation. Every swing of his aluminum bat was fueled by the cold adrenaline coursing through his newly healed hands. He didn't think about his ruined baseball career. He didn't think about his mother in Incheon. He only saw the white, milky eyes, the snapping rows of translucent teeth, and the rhythm of Kael's boots shifting through the gore three feet to his right.
*Swing. Crack. Step back.*
*Block with the barrel. Pivot. Drive the heel.*
A stalker managed to bypass Min-Jae's guard, its claws raking across his lower leg. The heavy denim of his school trousers tore open, three thin lines of red springing across his shin, but the blow lacked the leverage to sever the tendon.
Min-Jae didn't scream. He let out a low, guttural grunt, dropped his center of gravity, and drove the end of the bat like a spear straight down into the creature's open maw, punching through the back of its throat until the aluminum jammed against the vertebrae.
To his right, Kael was a machine of cold, brutal efficiency.
He didn't waste movement. Every stab was lethal; every parry redirected an attack into another monster's flank. His reinforced forearms absorbed the impact of snapping jaws and thrashing talons, the hardened, leather-like skin beneath his undershirt turning aside blows that would have shredded normal human flesh.
When a particularly large stalker—nearly six feet long, with thick, calcified ridges along its spine—lunged from the ceiling arch, Kael didn't try to block it.
He dropped flat onto his back, letting the beast's massive weight sail over him. As it passed inches above his chest, he drove both knives upward, burying the blades into its soft, unarmored belly and ripping them down the entire length of its torso as its momentum carried it forward.
The creature crashed onto the concrete behind him, its internal organs spilling onto the track in a steaming, foul-smelling heap.
Kael rolled back to his feet in a single, continuous motion, his blades dripping with dark fluid, his dark eyes scanning the culvert mouth.
The sound of skittering claws had stopped.
The heavy, splashing rush from the deep pipe was gone, replaced only by the slow, rhythmic dripping of bloody water from the vaulted brick ceiling.
Silence reclaimed the junction.
Around their boots lay the mangled carcasses of fourteen river-stalkers, their gray-blue bodies twitching occasionally in the dark as their nervous systems died.
Min-Jae was leaning against the concrete pillar, his chest heaving violently, his forehead dripping with sweat that washed clean tracks through the black grime on his face. The aluminum bat in his hands was warped, the barrel dented and smeared with gray tissue and blue slime.
"Is that... all of them?" Min-Jae wheezed, wiping his bloody shin with the hem of his torn blazer.
Kael didn't answer immediately. He stood in the center of the kill zone, his head slightly tilted, his enhanced auditory senses filtering through the subterranean gloom.
Forty yards up the northern service line, he heard the dull, metallic *THUMP* of a fire barrier rattling against its frame, followed by a muffled shout from Jin-Hyuk: *"Down! Drive the iron down! Don't let it turn!"*
Then came the wet, crunching sound of a crowbar hitting bone, followed by silence.
"The gate held," Kael said, his voice level, completely devoid of the ragged breathlessness racking Min-Jae's lungs. "Jin-Hyuk killed the two that bypassed our flank."
Min-Jae slid down the pillar until his rear hit the wet concrete, letting his bat clatter to the stones beside him. "God... Hyung. My shoulders feel like they're on fire."
"Stand up," Kael said.
"Just... thirty seconds, Hyung. Please."
"Stand up, Min-Jae," Kael repeated, his tone firm but not angry. "If you sit in the blood while your body cools down, your muscles will lock up from the lactic acid. Stand up, walk in a small circle, and draw your utility knife."
Min-Jae grimaced, but he forced his legs under him and pushed himself off the pillar, wobbling slightly before finding his balance on the slick ballast. He pulled his four-inch utility blade from his belt with stiff, aching fingers.
"We harvest now?" Min-Jae asked.
"We harvest now," Kael said. "Fourteen bodies. The cores are smaller than the excavator's, but they're Grade 1 high-density. If we leave them in the meat for more than twenty minutes, the residual bio-energy disperses into the bone marrow and becomes useless."
Kael knelt beside the first carcass. With two clean, practiced incisions, he split the cartilage behind the creature's neck and dug his fingers into the cavity.
He pulled out a smooth, oval-shaped core.
It wasn't amber, and it wasn't violet. It was a pale, icy cyan, glowing with a soft, steady luminescence that smelled faintly of cold water and ozone.
He dropped it into the canvas bag at his waist and moved to the next body without pausing.
"Min-Jae," Kael said as he worked.
"Yeah?"
"You didn't drop your hands when the three came through at once. You kept the bat high."
Min-Jae stopped his knife above a carcass, looking over his shoulder. "I was terrified, Hyung."
"Fear is a biological mechanism designed to flood your muscles with oxygen," Kael replied, extracting a second cyan core with a wet *pop*. "Panic is what happens when you let that oxygen run your mouth instead of your arms. You didn't panic. That means you get to see tomorrow."
Min-Jae stared at the glowing cyan stone he had just pulled from his first kill. The light reflected in his tired, bloodshot eyes, painting his bruised face in cool, pale blue.
"Tomorrow," Min-Jae murmured, closing his fingers around the cold crystal. "What happens tomorrow, Hyung?"
Kael stood up, wiping his blood-slick blades on the dead beast's flank before sliding them back into their sheaths with a crisp, dual *click*.
He looked past the pile of corpses, into the black, silent throat of the culvert that led four miles south toward the open ruins of the Han River basin.
"Tomorrow," Kael said, "we stop waiting for them to crawl up our pipes. We go down to the river and we take the gate."