The timber gate of the Third Watchtower swung shut behind Lu Chen with a dull, hollow thud, cutting off the shriek of the blizzard.
Inside, the air was thick, suffocating with the greasy reek of burning seal tallow, unwashed wool, and the sour rot of infected flesh. The blockhouse had been hewn from heavy black pine trunks, strapped together with rusted iron bands that wept frozen orange rime in every seam. An open hearth smoldered in the center of the flagstone floor, spitting damp sparks against the blackened rafters.
Around the hearth huddled four perimeter guards in battered hide armor, their frostbitten noses buried in clay bowls of steaming mutton broth.
None of them rose when Lu Chen entered. In the isolated watchtowers along the north ridge, where the wind never ceased and the Desolate Void pressed close enough to freeze a man's spittle mid-air, every breath of warmth was hoarded like silver.
"Who let the draft in?" a harsh, grating voice barked from the rear alcove.
The speaker sat on a heavy pine bench beside a smoldering brazier, his right boot kicked off and his swollen, blackened foot resting on an oily sheepskin.
Captain Wu.
Like the dead Sergeant Zhao, Wu was an Ironbone veteran who had survived twenty winters on You Ming, but there was no swagger left in the man. His hair was grizzled with dry slate dust, his hollow cheeks carved deep with bitter creases, and his right ankle had swelled to the thickness of an ox's knee. Four toes were blackened into dead gristle, oozing foul yellow serum through soaked linen wraps. In his left hand he gripped an iron-banded trench axe, its head scarred from chopping frozen rock.
"The forge," Lu Chen said, keeping his shoulders rounded and his voice hoarse, extending the earthenware crock with both hands. "Master Yan sent the sixty-day bitter-root wash."
Wu’s lone good eye narrowed, flicking from the wax-sealed crock to Lu Chen’s snow-dusted tunic.
"You took your time, runt," Wu growled, his jaw tightening as an involuntary spasm seized his rotting foot. "The muster horn blew half a chime ago. If that old butcher had delayed another dawn, I would have had to chop the toes off with a wood chisel. Hand it over."
Lu Chen crossed the flagstones with measured, shuffling steps, keeping his weight grounded to conceal the uncanny lightness in his thighs. He set the heavy crock on the low table beside the captain’s stool, alongside an iron scraper and a pile of dry moss.
Wu reached down with a soot-stained knife, slicing through the wax seal with an impatient jerk. He pried the clay lid free; a pungent, eye-watering stench of boiled sulfur, lead bloom, and caustic lye rose into the alcove, so foul that the sentries around the central fire turned their heads in disgust.
"Good," Wu grunted, dipping a blunt wooden spatula into the black, tar-like grease. "The old dog still knows how to boil the bite into it."
He paused, the spatula hovering over the crock. His bloodshot gaze flicked upward, fixing onto Lu Chen’s coat.
"The terrace gate was locked down when the horn blew," Wu murmured, his voice dropping into a low, raspy drawl. "Tie’s enforcers have the hoist platforms barred with iron clubs. How did an apprentice cross the gorge with a crock full of oil?"
Lu Chen lowered his eyes, fixing his gaze on the wet floorboards between the captain’s boots.
"Master Yan told me to take the outer sheep trail along the cliff face," Lu Chen whispered, his voice trembling with practiced dread. "He said if the captain’s foot rotted before the muster, the blame would fall on the forge. I crawled on my belly through the ice ruts."
One of the sentries by the hearth let out a short, snorting laugh. "A rat crawling along the sheer face in a gale. Surprised the wind didn't pitch you down into the mist, boy."
Wu spat into the brazier, the tobacco juice hissing against the coals.
"Tie," Wu snarled, his scarred jaw tight with long-nursed hatred. "That grey-bearded bastard sits in the inner garrison with three charcoal pots between his shins, hunting for phantom thieves while the perimeter sentries rot on their posts. A sergeant takes a drunken dive off the chasm, and Tie treats the whole mountain like his personal dog kennel."
The captain shook his head in bitter contempt, completely dismissing any thought of the trail. To an officer on the north ridge, Tie’s discipline purge was nothing more than inner-camp arrogance.
"Hold the foot, boy," Wu commanded, pointing a calloused finger at his swollen ankle. "Keep the heel straight while I scrape the dead meat."
Lu Chen knelt in the grime beside the bench.
He reached out, his calloused hands taking hold of Wu’s thick, iron-hard calf. The skin was dense, tough as cured ox-leather from decades of bone-tempering, but around the blackened ankle, the iron vitality had decayed into cold, sluggish rot. Through his palms, Lu Chen could feel the faint, stagnant pulse of Wu’s battered vessels.
With his other hand, Wu brought the spatula down, smearing the caustic black paste straight into the weeping sores.
The captain’s entire frame went rigid as iron.
A ragged, whistling breath caught in Wu’s throat, his knuckles whitening around the shaft of his trench axe until the wood creaked under the strain. The bitter-root wash did not soothe; it burned with the ferocity of liquid fire, the caustic lye eating through dead gristle to cauterize the rotting marrow within. Black froth bubbled along the edges of the wound, hissing softly against the grease.
Yet through the searing agony, the veteran’s jaw remained clamped shut, veins bulging like cords across his scarred temples.
After ten long heartbeats, Wu let out a shuddering gasp, his head slumping back against the pine wall as the violent throbbing in his foot began to subside into a numb, icy deadness.
"That... that has the teeth," Wu wheezed, wiping a film of cold grease from his forehead with the back of his hand. "Bind it tight with the dry moss. Don't let the draft get into the seam."
Lu Chen worked swiftly and silently. He packed the caustic dressing with clean moss and bound it firm with strips of oiled hemp, tying the knots with the deft efficiency of a forge hand.
When the wrapping was secured, Lu Chen wiped his fingers on his coat hem and stood up. He reached into his belt and produced a small slate tablet bound in hide—the forge’s receipt register.
"Master Yan needs the tallow mark, Captain," Lu Chen said. "For the inventory ledger."
Wu took the iron stylus from the table, pressed it into a cake of hardened red sheep tallow, and stamped his official garrison seal onto the slate with a sharp, heavy click.
He held the slate out to Lu Chen, but he did not release it immediately.
The captain’s grey eye bore into the apprentice, cold and penetrating.
"You have clean hands for a furnace boy," Wu said quietly, his voice low enough that the guards by the hearth could not catch the words. "And you don't wheeze like you used to. Last winter, you couldn't carry a four-pound crucible without spitting black phlegm into your collar."
Lu Chen kept his expression frozen, his pulse steady beneath the discipline of his inner core. "Master Yan brews a lung-clearing tea from the sulfur dregs, Captain. I drink it every dawn."
Wu gave a faint, mirthless grunt. He did not press the matter; in this valley, every slave who survived three winters had some dirty trick tucked beneath his ribs.
"Tell the old man to brew more," Wu murmured, leaning closer as he released the slate. "And tell him to hoard his clean shale. The purge Tie is running today is only the first rake of the comb."
Lu Chen slipped the slate into his tunic, his ears sharp. "The first rake?"
"Aye," Wu rasped, his gaze flicking toward the barred window that looked out over the boundless emptiness of the Desolate Void. "The fifth drift blowout wasn't an accident. The gas broke because the deep formations are decaying. The nine Traitor Elders in the high citadel are growing desperate. In seven dawns, the Leyline Iron Ships arrive from the capital world to collect the seasonal tribute."
The skin along Lu Chen’s jaw went cold as shale, though his expression remained a mask of dull obedience.
*The Leyline Iron Ships.* The massive, void-faring dreadnoughts that chained the nine penal planets to the immortal courts above.
"When the iron ships dock," Wu continued, his voice dropping into a conspiratorial rasp, "the elders will not rely on Tie's clubs. Their disciples will carry the Bronze Harmonic Thrum Mirrors through every quarry and workshop. One flash of that mirror against a man's breast, and if there is a single wisp of unrefined celestial breath or stray Qi hidden in his vessels, his marrow will burn like dry flax right before their eyes."
Wu leaned back against the timber wall, closing his eyes as exhaustion overtook him.
"Tie is looking for stolen picks and dead sergeants. The elders will be looking for souls to crucify before the tribute barges. Tell Yan to scrub his pots. When the bronze mirrors flash, Cold Bone Valley will run red with blood."
Lu Chen bowed low, his heart hammering against his ribs in quiet, desperate realization.
"I will give Master Yan the warning, Captain."
"Now get out," Wu muttered, waving a hand toward the door. "Take the main road down when the third horn sounds. The dogs should have finished their rounds by noon."
"Yes, Captain."
Lu Chen turned on his heel, tucked his sleeves into his coat, and slipped through the timber threshold into the shrieking mountain gale.
Standing on the frozen basalt landing, watching the endless black void beyond the precipice, Lu Chen’s hand crept to his belly.
Seven days.
In seven days, the bronze mirrors would come to Cold Bone Valley, scouring every scrap of flesh for the scent of Qi.
If he remained as he was, the first flash of light would illuminate the revolving vortex in his core, sealing his fate upon the executioner's gallows.
He didn't just need to cultivate.
He had seven dawns to learn how to bury his breath so deep that even the gods' mirrors would see only cold, hollow meat.