When Lu Chen tucked his left hand back into the sleeve of his coat, his fingers were still trembling.
It was not from terror, but from the strange, uncoiling warmth that had gathered in the pit of his belly, radiating through his cold midsection like an ember banked in dry ash.
He pulled the heavy stone slab shut behind him, cutting off the howling gale and the distant clatter of shovels scraping blood from the courtyard. When he turned, Master Yan’s lone eye was fixed upon him, sharp with the hard suspicion of an old man who had survived forty winters in a penal camp.
"What was it out there?" Yan rasped, his iron pestle resting against the edge of the mortar.
"One of the senior disciples," Lu Chen said, keeping his voice quiet and shaken, the way a frightened apprentice was expected to sound. "His chest burst. They are shoveling the remains over the cliff."
Master Yan let out a long, wheezing breath, the old burn scars across his throat tightening. "Fools," he spat, bringing the pestle down into the lead roots with a dull crunch. "They beat their meat until they cannot bear the pain, and then they gasp for air. That invisible poison in the draft hunts for an open lung. Let it inside, and your bones turn to ash. Now get to the kettle. Ba Shan will be here at dusk, and if his paste is not ready, he will take his temper out on the furniture."
"Understood, Master."
Lu Chen sat on the low wooden stool by the hearth. Before taking up the bellows, his hand crept to his lower stomach, pressing against the hollow beneath his navel.
The warmth was still there.
Ordinary men in this valley considered that space nothing more than empty gristle, a soft spot to protect with layers of hardened hide. Yet deep within that void, the wisp of violet light rested, faint as a hearth spark beneath grey soot. It brought no fever, no sickness; like a smooth river stone warmed by summer sun, it radiated a steady heat that seeped into his chilled bones.
And for the first time since the first frost, his lungs did not burn when he drew a deep breath.
He did not speak another word until the dark fell.
He stirred the black bitumen, weighed the sulfur stone on the balance beam, and worked the bellows until the coals glowed dull cherry-red. By the time the artificial sun flickered out and the valley was swallowed by the black void, two earthenware jars of dark green, caustic Bronze Paste had been set on the cooling bench.
"I am turning in," Master Yan said, rubbing the stiff hump of his spine as he limped toward his sleeping burrow at the back of the cave. "Damp the shale before you sleep. The wind tonight sounds like a pack of wolves."
"Goodnight, Master."
***
Lu Chen’s sleeping quarters were nothing more than a crude stone alcove built against the outer cliff, where the draft whistled through every unmortared seam.
There was no brazier. Only a bed of stiff wolf pelts over the rock, a flickering grease wick in a clay dish, and a rough pine bench where he kept his bone-scrapers and iron pins for dressing roots.
He trimmed the wick, plunging the small room into deep shadow.
Through the crack in the wall, the sky was pitch-black. No stars. The Desolate Void loomed over the world like an open grave, freezing everything it touched.
Lu Chen sat cross-legged on the pelts, pulling his knees to his chest. His joints ached from the cold stone, but his mind was awake with a desperate, fearful curiosity.
He closed his eyes and turned his attention inward, searching for that faint heat in his belly.
When he reached for it with his will, the wisp stirred.
It did not fight him. It lengthened, trailing a thread of violet warmth along his ribs, flowing smoothly into the inner pathways of his chest.
Lu Chen held his breath, fear tightening his throat. If the thread rebelled, his frail chest would tear open just like that disciple on the terrace. But there was no friction. The warmth glided through the stiff, frostbitten vessels of his left arm like hot oil through dry leather, soothing the chronic ache in his wrist bones. When it reached his fingertips, his left hand felt lighter, warmer than it had ever felt in his life.
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"This is not poison," he murmured into the dark, his breath misting before his face. "Their flesh is crude gristle... their channels are blocked with lead and scar tissue. When the breath enters them, it has nowhere to go."
His body, starved and frail as it was, had channels open to the flow.
The wooden door was kicked inward with a violent crash that tore the leather hinges from the frame.
The mountain draft rushed into the alcove, blowing the grease wick out instantly. In the doorway stood a broad, hulking shadow reeking of stale sweat and dried blood.
Ba Shan.
He had thrown a filthy bearskin over his shoulders, his left side swollen and black from the morning drill. Every ragged breath he drew sounded like a saw cutting green wood, his face twisted in raw, bitter pain. In his right hand, he held an iron-framed lantern, casting yellow light across the room.
"Still awake, runt," Ba Shan snarled, his breath pluming in the freezing air. "Is the old cripple asleep?"
Lu Chen scrambled back against the rock wall, his heart leaping into his throat. He kept his hands tucked into his sleeves, his fingers curling tight around the lingering thread of heat in his left palm.
"Master Yan is asleep," Lu Chen said, his voice shaking despite his efforts to keep it steady. "Your paste is cooling on the bench. It will be cured by dawn."
"I am not waiting for dawn!" Ba Shan took a heavy, lurching step into the room, the boards under his feet creaking under his bulk. "My fifth rib is cracked. The bone is grinding with every breath I take. I know the old man keeps a jar of the double-boiled marrow paste in the back. Go get it."
"That paste is locked," Lu Chen whispered, his back pressed hard against the frozen rock. "The master keeps the key on his belt. If I touch it, he will turn me out into the snow."
"You think I care about your skin, rat?!"
Ba Shan lunged forward with a snarl. His heavy hand shot out, thick fingers knotting into the collar of Lu Chen’s tunic, lifting the boy off the pelts and slamming him against the rough timber bench.
The wind was driven from Lu Chen’s lungs with a sickening gasp. The wooden edge cut into his spine, and Ba Shan’s iron-hard forearm pressed down across his throat, cutting off his air.
"Get the jar," Ba Shan hissed, spittle flecking his lips, his yellow teeth bared in a snarl of agony and rage. "Or I snap your arms to match my rib. No one will miss a useless stray like you."
The brute's weight was crushing. Lu Chen’s heels drummed uselessly against the stone floor, his vision blurring as his windpipe closed. Panic, cold and vicious, flooded his mind. He was going to die here, choked to death on a grease bench in the dark.
His right hand clawed frantically across the bench top, his fingers closing around an iron needle used for punching root husks.
Against Bronzeflesh hide, dull iron would have bent like tin.
But as his grip tightened on the shaft, Lu Chen did not think of cultivation or ancient texts. In sheer, blind desperation, he shoved the wisp of violet heat from his chest straight down his arm and into the cold iron pin.
A faint, razor-edged hum vibrated through the metal.
Ba Shan cocked his fist back to strike.
Lu Chen drove the needle upward with all the strength in his starved body, aiming straight for the swollen purple seam beneath Ba Shan’s left armpit—the tender gap where the cracked fifth rib lay exposed.
The needle did not bend.
Carried by the violet hum, the iron point slipped through the dense muscle like a hot wire through cold lard, driving deep into the fractured bone seam.
Ba Shan did not even scream.
A wet, whistling choke caught in the giant’s throat. His bloodshot eyes bulged as the pain shorted out his arm. The cracked rib grated against raw marrow and tender sinew, sending a sickening convulsion through his entire torso. His grip on Lu Chen's collar tore open instantly.
His two-hundred-pound frame went slack as a dropped sack of grain, crashing heavily onto the frozen floorboards. The impact jarred his broken bone again, forcing a ragged, frothing groan from his lips as his left arm twitched with uncontrollable tremors.
Lu Chen rolled off the bench, landing on his hands and knees, coughing violently and gasping for air as he clutched his bruised throat.
On the floor, Ba Shan groveled in the straw, his face drained of color, his chest heaving with terrified, shallow wheezes. The brute stared up at the frail apprentice with raw, animal horror, convinced the boy had driven some deadly apothecary poison into his marrow.
"What... what did you put in me..." Ba Shan wheezed, clawing at the stone floor with his good hand to drag himself backward toward the doorway.
Lu Chen rose slowly to his feet, leaning against the bench to keep his trembling legs from folding under him. His voice was hoarse, raspy from his bruised throat:
"Take the green jar from the bench outside and get out. If you say a word of this... the next pin will not stop at the rib. It will find your throat."
Ba Shan did not utter another sound. Grasping his dangling arm, he scrambled through the broken doorway on his knees, snatched the clay pot from the forge threshold, and fled into the shrieking storm.
The hovel fell silent, save for the bitter howling of the wind through the shattered entrance.
Lu Chen slumped back onto the wooden pallet, his entire body trembling with the aftershocks of terror. His throat throbbed with pain, and his belly was empty of heat once more.
He looked down at the iron needle in his hand. Then his eyes drifted to a rusted bone knife lying among the shavings on the bench.
He had driven an iron pin through Bronzeflesh without brute force.
With trembling fingers, Lu Chen reached toward the knife, stopping short of the rusted hilt.
He called upon the faint, dying ember in his core, extending a gossamer thread of warmth through his skin into the cold air.
The thread touched the rusted iron.
The knife shuddered.
And then, scraping softly against the wood, it lifted.
Barely an inch off the tabletop, wobbling against the freezing draft, the rusted blade hung unsupported in the gloom.
Lu Chen watched it hover, the veins at his temples throbbing with strain, before the last wisp of energy gave out and the iron clattered back to the timber.
He fell back onto the wolf pelts, pulling them tight against the bitter draft, his breathing ragged in the dark.
Every man in this valley battered his flesh against stone and broke his bones to survive the winter. They needed mountains of muscle just to live another day.
He did not.
He could make cold iron move without a hand.