The warning came too late to halt the driving force of the math.
Ji Mingchuan’s final jade bead clicked against the upper star-fallen rail with the sharp, decisive crack of a headsman’s axe. The violet stress lines projected from the Nine-Fold Abacus snapped into brilliant, solid posture, slicing through the seventy-two bronze bolts like hot wire through sheep’s fat.
A sound like the shearing of an iron continent tore through the entry hall.
The seventy-arm-length bronze portal shivered. The ancient green rust along its outer edge shattered into a blinding turquoise cloud. Along the central seam, the hairline gap widened by three-eighths of an inch.
Through that tiny fracture, the water hammer arrived.
It wasn’t a gentle rush of liquid. Behind the seventy-arm-length bronze barrier rested forty thousand tons of Primordial Liquid Dao, stacked under forty-two sea-weights of deep water pressure. The salt water escaped through the gap not as water, but as a screaming, cavitating blade of hyper-high-pressure fluid.
Psssshhhhhh-SHRIIIIIEK!
The jet of water whistled across the chamber at the speed of an iron ball fired from a siege bombard. Where the high-pressure stream struck a three-span marble column thirty paces distant, it didn’t splash. It bored straight through the dense stone like an auger, blasting a cloud of crushed chalk and water into the air. The column groaned, its load-bearing flutings crumbling as water carved through thirty arm-lengths of solid rock in less than two breaths.
The sudden drop in pressure behind the gate started a total sound feedback loop. The floor flags beneath their feet began to heave, buckling upward as the trapped air pockets inside the underground channels shrieked in clockwork agony. The water level in the entry hall surged upward by two feet in five seconds, frothing with white cold air foam.
Ji Mingchuan was thrown backward onto his hips, the scummy salt water washing over his chest. His Nine-Fold Abacus slipped from his grasp, splashing into the green water. At the same time, his brass chest gyroscopes whined in blind panic, shaking so hard they tore the seams of his silk tunic.
“The pressure...” the Scholar gasped, his double pupils dilating in sheer, horrified disbelief as he stared at the screaming fissure. “The high-pressure mass... It defies the spatial equations!”
“Get behind the stone temple steps!” Qiao Ming roared.
Qiao Ming did not retreat to the dry stairs. He stepped straight into the boiling surf, his bare, calloused feet planting themselves upon the underwater flat stone slabs of the ninth step. His splayed toes locked into the drainage grooves, using the huge mass of the foundation as his balance weight.
With a fluid, practiced motion born of ten thousand soundings, he uncoiled the sixty-fathom knotted horsehair line from his bone reel.
He didn’t cast the line like an angler seeking fish. He gripped the cord three spans from the end-post knot, allowing the eight-pound six-sided lead bob to swing in a low, swinging weight sweep between his knees.
The soft lead weight, packed with fresh sheep fat at its narrowed base, cut through the spray with a dull hum.
One swing. Two swings.
Qiao Ming pivoted upon the ball of his right foot, throwing his entire torso into a wide, sweeping outward-pulling arc. The eight-pound weight whipped through the damp air at twenty-two meters a second, circling his shoulders in a blurred halo of black stallion hair and dull gray metal.
As the lead bob cut through the air, it didn’t produce the whistle of an ordinary weapon. The ancient tidal trigrams etched into its eight facets caught the draft, shaking at exactly a deep hum—the deepest sound deep ring of the flooded hall.
The sound was not loud, but it possessed a terrifying, low, deep thickness that rang in the hollow cavities of the statues and the bones of the two men.
“Venerable Mother of the Sieve,” Qiao Ming whispered, his breath out perfectly timed with the bottom of the arc. “Clear the deck drains. Quiet the weir.”
On the third rotation, Qiao Ming cracked the line downward.
The eight-pound lead bob struck the water with pinpoint accuracy. It slammed into the exact vortex whirlpool forming above the hidden drainage channel beneath the ninth step.
THUUUUM.
The impact produced a dull, bone-shaking boom that sent a blast wave traveling through the liquid medium. In water, sound travels four times faster than in air, carrying its energy without scattering. It wasn’t a destructive blow. It was a targeted injection of an anti-phase sound standing wave.
The effect was instant and sublime.
The 114.2-hertz shaking traveled straight down the underground drain tube, striking the churning water vortex at the precise ringing angle needed to destroy its smooth-flowing focus. The cavitating whirlpool beneath the ninth step collapsed into frothing, disordered bubbles.
At the same time, the sound blast wave traveled through the flooded floor toward the Great Archival Portal. It struck the thin, screaming jet of high-pressure salt water escaping the bronze seam.
The anti-phase hum canceled the pressure differential.
The screaming blade of water, which had been sawing through marble pillars moments before, suddenly lost its high-pressure focus. It dissolved into a broad, harmless fan of white spray that cascaded down the bronze leaves like rain against a windowpane.
Deprived of the churning pressure drop empty pocket, the huge seventy-arm-length bronze doors shuddered once, their massive weight overcoming the fluid push. With a deep, underground thud that rang through three miles of stone foundations, the gates slammed shut, dropping back into their green rust-crusted seating grooves.
The water hammer died.
The roaring in the channels choked into a soft, gurgling sigh as the seventy-two floor deck drains swallowed the excess surge. Within ten breaths, the surface of the entry hall had flattened back into a calm, emerald-green mirror, rippled only by the gentle falling water drops from the high vault clouds.
Qiao Ming stood on the ninth step, his chest heaving with slow, measured breaths. He retrieved his lead sounding bob hand-over-hand. He wiped the wet horsehair cord against his oilskin apron before securing the weight back to his bridle-leather harness. His hands were steady. Not a single muscle in his face betrayed panic or pride.
Ten paces away, sitting waist-deep in the scummy salt water with duckweed plastered across his chest, Ji Mingchuan stared at him.
The Scholar had retrieved his Nine-Fold Abacus from the water, clutching the black-iron frame to his ribs like a frightened child holding a broken toy. His tall scholar’s crown was tilted askew, his green rust-crusted silver hairpin hanging loose, while drops of muddy salt water dripped from the tip of his high-born nose.
His double pupils had ceased their rapid rotation. They were locked in wide, unblinking horror upon Qiao Ming’s bare, scarred feet.
Ji Mingchuan had spent three hundred years studying the grand martial treatises of the Upper Heavens. He had witnessed Grand Elders cleave mountains with void-swords. He had seen Heavenly Sovereigns burn up starfields with divine fire.
Yet what this barefoot scavenger had just done defied every doctrine of spiritual training.
There had been no spiritual qi in the strike. No dantian training, no immortal essence, no sky dao-spells. The young man had simply swung eight pounds of soft lead on a horsehair string, found the exact sound hum of forty thousand tons of water. Then he canceled a nearby apocalypse with a single ripple.
“What... What manner of beast are you?” Ji Mingchuan whispered, his voice cracking like dry bamboo. He tried to scramble to his feet, but his sodden skirts weighed him down. That forced him to lean against the barnacled stone stand of a seated judge. “There was no qi in that strike. No immortal intent. No core deep ring. How did you command forty thousand tons of Liquid Dao with a lump of lead?”
Qiao Ming looked down at his bone reel, checking the tension of the horsehair windings before looking across at the drenched Scholar.
“I didn’t command the water, honored guest,” Qiao Ming replied, his voice returning to its calm, steady beat. “I merely spoke to it in the hum it understands. Water does not yield to commands. It yields to harmony.”
“A hum...” Ji Mingchuan murmured, his double pupils spinning erratically as he tried to force the concept into his academic models. “An ancient hum. Did you uncover an immortal jade slip in the silt? Did the soul of a Drowned Sovereign impart the sound cipher to you in a dream? Speak! Who gave you the ringing key to the Ninth Step?”
Qiao Ming shook his head slowly. He unhooked a dry linen cloth from his harness and began wiping the fine spray from his brass star-compass.
“No one gave it to me, traveler. The House speaks its key every day, to anyone who cares to listen. When the morning tide fills the under-water gates, the pillars ring like bells. When the ebb draws water through the floor grates, the drains whistle. If you spend forty cycles sounding the depths with a lead line, counting the intervals between the drop of the plumb and the return of the echo, the hum reveals itself. Every chamber has a natural tone, just as an empty clay jug rings when you blow across its rim.”
Ji Mingchuan stared at him, his gaunt face twisting in deep mental sour note.
In the Upper Heavens, knowledge was power, forged in bloody wars and guarded behind ninth-tier sect wards. Fighters spent thousand years murdering their kin to get ancient scripture scrolls. Yet here stood a barefoot land-mapper who had discovered the ultimate secret of water-pressure power simply by sitting quietly in the dark, dropping a lead weight, and listening to the water.
To Ji Mingchuan, that simplicity was more terrifying than any divine spell. It suggested that all the complex mathematics of the Obsidian Scroll hall, all the blood spilled for the Blood-Pact of the Final Ark, was merely the blind thrashing of arrogant children who could not read the stone beneath their feet.
“Madness,” the Scholar whispered, his fingers trembling as he clutched his counting frame against his bruised ribs. “A savage idiot who mistakes routine for enlightenment.”
“You may call it what you wish, traveler,” Qiao Ming said softly, pointing toward the black-iron frame in the Scholar’s lap. “But your counting frame is sitting in the salt water. If you don’t dry the star-fallen wire with sheep fat before third bell, the salt crystals will freeze your jade beads in their tracks. Your next math will fail.”