The Sluice of Red Barley

The limestone floor dropped half an inch under Tan Fenglan's boots, the bronze seal ring at her waist ringing against the stone. She did not reach for the wall. She dropped to one knee, pressed the flat of her bronze sounding rod against the seam between two flagstones, and felt the iron dowels inside the masonry tearing like dry hemp.

"The southern footings are gone," Xie Yunshan said from the edge of the pit. He was wiping black ichor from his bronze pick with a handful of crushed barley chaff. His sleeve was ripped to the shoulder, the skin underneath scored gray by the beast's venomous vapor. "Three hundred paces of dead cedar, split down the grain. If you leave twenty thousand bushels sitting in the ceiling hoppers, the whole floor shears into the chasm before the water-clock clears the third mark."

Fenglan stood. Her fingers were stiff with cold oil and ground copper dust. Across the vaulted chamber, four of Captain Mengze's archers held smoking pitch brands over the central drop-well. Beside them, Bai Tingxu knelt at the rim, his notched butcher's cleaver resting across his knees, watching the black grease bubbling up from the flues.

Below them, eighty cubits down in the darkness, a heavy, wet rasping surged through the masonry. The Alpha had not retreated to the deep earth; it had coiled itself into the bottleneck of the lower hopper, its breathing valves whistling as it drew cold air through the ruptured foundation.

"Those hoppers hold the seed reserve for the northern commanderies," Fenglan said. Her voice was flat, clipped with the cadence of the magistracy. "Seven years of tax tribute. The seals on the release drums bear the third emperor's mark. Break them, and we commit treason before the grain hits the mud."

Mengze leaned against an unbroken granite pillar, wiping soot from his bronze cheekpiece. A thin cut ran along his jaw, leaking dark blood into his collar. "The third emperor died six dynasties ago, Conservator. His bronze seals will make very poor ballast when two hundred tons of masonry drop into your lap." He gestured toward the archers with his chin. "My men have four incendiary bolts left. If that thing clears the vent collar again, we are not shooting at it. We are climbing the hoist ropes to the third tier and leaving you to read your ledgers to the dark."

Yunshan did not look up from the stones. He had taken a chunk of white leveling chalk from his belt and was dragging it across the floor in long, jagged lines. Three intersecting triangles formed on the damp flags, their points converging on the central bronze sluice housing.

"The weight is eight hundred piculs across each bay," Yunshan said, tapping the chalk against the bronze plate. "Twelve bays above our heads. The two western pilings are holding eight times their design load because the southern foundation dropped into the cistern. The cedar is already splintering inside the stone sleeves. Listen to the pitch of the floor."

Fenglan closed her eyes for a second. The deep note was not the groaning of stone against stone; it was a high, singing wire of overstrained copper dowels ready to snap.

Her hands moved before her pride could stop them. "Han Ba," she called out. "Fetch the two-man capstan bars from the winch locker. Mengze, get your archers on the tension chains. If we drop the grain all at once, the recoil will kick the remaining pillars out of their footings. We have to stagger the gate."

"The gate is jammed," Han Ba grunted, hauling two heavy ash beams across the slanting floor. "The counterweights slipped when the worm breached the lower flue. The bronze dog is wedged solid in the ratchet teeth."

Fenglan stepped onto the canted plate of the main sluice housing. The bronze casing had warped under the torque of the settling floor, bending the master release axle three inches out of true. The primary shear-pin, a three-inch bar of cast bronze, was caught between two teeth of the main cog, held fast by twenty thousand bushels of unground grain pressing against the overhead timber traps.

She did not call for a sledge. A hammer strike on the stressed bronze would shatter the teeth and drop the entire payload in a single catastrophic collapse.

She unhooked her sounding rod. The rod was tapered, forged of work-hardened bronze, marked with cubit notches along its length. She slid the narrow tip into the relief slot beneath the locking dog, using the pivot point of the casing as a fulcrum.

"Yunshan," she said. "Put your pick into the secondary pawl. When I lift the housing, the torque will try to spin the axle backward. Catch the third tooth, not the second. If you miss, the handle will break your arms."

"I have caught heavier drops than this," Yunshan muttered, wedging the curved beak of his bronze pick into the bronze gear.

Fenglan planted her heels against the raised lip of the rim plate. She threw her entire weight onto the long end of the sounding rod. The metal flexed, biting deep into the meat of her palms. The copper dowels in the floor groaned in sympathy, a sharp screech of metal under grinding friction.

For three seconds, nothing moved. The strain pulled at her shoulder joints, the weight of a dying empire caught in the bite of a bent bronze bar. Then the shear-pin shifted. A hollow crack echoed inside the casing as the pin popped free of the jammed tooth.

Yunshan shoved his pick into the ratchet. The bronze teeth met with a brutal clang that sent sparks spraying across the flagstones. The axle held.

"Mengze!" Fenglan shouted, her breath raw. "Throw the capstan!"

The captain and Han Ba leaned their chests into the ash bars. Four archers caught the balance chains, throwing their weight downward.

With a shriek that drowned the rasping of the beast below, the twin overhead trapdoors groaned, tilted, and swung wide.

A wall of red barley dropped from the ceiling.

It came down not as loose grain, but as a solid, roaring avalanche, thousands of bushels plunging in a continuous column through the central chute. The air in the chamber vanished, replaced by an eye-stinging cloud of grain dust that swirled in thick, golden billows around the torches. The floor beneath their boots gave a violent lurch upward as nearly five hundred tons of dead weight poured off the upper framework.

Below in the chasm, the roar of the grain met the fury of the beast.

The Alpha screamed. The sound was a muffled, wet detonation, a shriek choked off by twenty thousand bushels of unground grain flooding down its throat, burying its dorsal plates and filling the narrow flue with an impenetrable mass of starch and husks. The violent shudder in the foundations slowed, dampened by the immense bulk of the falling crop.

Mengze dropped his capstan bar and fell back against the pillar, coughing violently into his sleeve. He spit a mouthful of red grain dust onto the stone and looked at Fenglan through reddened eyes.

"Congratulations, Conservator," Mengze rasped, his voice full of sour amusement. "You just buried the winter rations of forty garrisons under thirty feet of horse feed. The Board of Revenue will probably take three days skinning you before they let you hang."

"They will have to find forty unbroken pilings to hang me from," Fenglan said. She wiped her forehead with the back of her sleeve, leaving a streak of sweat and copper powder.

She walked to the edge of the central chute, looking down into the darkness.

The dust was settling, but the expected fire did not rise.

Mengze's archers had loosed two flaming arrows down the shaft during the drop, intending to set the dense cloud of grain dust alight and incinerate the Alpha in the flue. But below, where the barley had settled into the lower cisterns, only a thick, hissing vapor rose. The broken water conduits and fermented blood from the lower vats had turned the bottom of the pit into a freezing, sodden mire. The grain had not ignited; it had formed a suffocating, wet paste that held the Alpha pinned beneath tons of compact mass.

Tingxu leaned over the opening, his nostrils flaring against the sour stench of wet starch and cold blood. "The beast is gorging on the slurry," he said, pointing with his blade toward the dark bottom. "Its lateral spiracles are blocked by wet paste, but the central lung-sac is still pumping. It will digest the hull barrier in an hour and break through the foundation bedrock."

Yunshan stepped to Fenglan's side, looking down at the silent, smoking hole. His hand rested on his pick, his knuckles white against the dark bronze.

"The arrows drowned in the muck," Yunshan said softly. "The air down there is choked with gas and dry chaff trapped between the wet layers. One spark inside the vent will blow the whole flue out. But the spark has to come from the teeth."

Fenglan stared into the pit, where the dark mire shifted with the slow, terrifying rise of the Alpha's back. The silence in the vault was heavier than the stone above them.