The heat from Crucible One was not red or orange. It was a pale, blinding violet-white that made the surrounding air hum like a swarm of hornets.
Lin Ke stood at the tapping apron, wearing a thick leather apron and dark quartz goggles to shield his eyes from the heat glare.
Beside him, Meng Shan stood with a sixty-pound iron-faced sledgehammer resting against his boots, sweat cascading down his broad chest into his leather kilt.
“Grade-3 Feather-Pattern Essence Iron,” Meng Shan rumbled, his voice shaking slightly over the fire roar. “Brother Lin, I’ve worked in the foundries since I was seven. I’ve only ever seen the Inner Sect Elder Foundry pour Essence Iron. They use Foundation Establishment True Fire and twenty bushels of sky charcoal for a single twenty-pound bloom. We... We have a coal-dust fire and quarry gravel.”
“Heat is simply striking force passed to core lattices,” Lin Ke said, checking the draft gauges with his brass measuring tongs. “A potion-made True Fire is merely a chaotic, high-energy heat source. If you can achieve the same heat-powered reaction pathway through chemical catalysis and sound shaking, you don’t need a Foundation Establishment core. You need precise process control.”
Lin Ke closed his eyes for a split second.
Tianfu. Branch.
At double test model speed, the phase diagrams calculated with breathtaking rapidity.
To achieve Grade-3 purity (99.9% pure elemental iron with lined up crystal-clear dendrites), traditional smelters used brute heat energy to burn away all carbon, sulfur, and phosphorus inclusions, losing forty percent of the iron volume in the process.
Lin Ke modeled a three-stage catalytic refining cycle:
Stage One: Phosphorus Dephosphorization. Use calcined bone-ash phosphorus not as a contaminant. But as a temporary heat-powered flux. At nine hundred degrees, phosphorus acts as a powerful reducing agent, binding to sulfur dirt and forming volatile sulfur-phosphorus gas that flashes off through the chimney.
Stage Two: Red ink Vapor Catalysis. Inject boiled away red stone flux through the lower tuyeres. The boiled away liquid silver atoms break the water’s skin of the molten iron puddle. It allowed tiny melted rock waste inclusions to float to the surface fifty times faster than in standard static melts.
Stage Three: Sound Dendritic Shattering. The true secret of “Feather-Pattern” iron was crystal-clear grain size. Normal cooling created large, brittle columnar crystals.
If Shen Yue could apply high-hum sound deep ring magic charms to the metal bar molds during cooling, the sonic shakes would shatter the growing crystal dendrites into billions of tiny, linked grains.
The resulting metal wouldn’t just be pure. It would be flexible, shatter-proof, and conduct spiritual intent with zero flow pushback.
Lin Ke cut the mental branch.
He opened his physical eyes. The math had burned up barely three seconds of real time.
He pricked his left thumb against his iron metal pen.
“Branch checked: main.”
He turned to his team.
“Meng Shan. Lower tuyere three. Inject the Red ink-bone ash slurry under three sea-weights of forced draft. Maintain sixty strokes per minute on the backup blower.”
“Understood!” Meng Shan roared, seizing the massive dual-lever air-powered bellows.
“Shen Yue,” Lin Ke pointed to the casting bed, where three chilled iron metal bar molds rested in damp sand. “Take your position at the mold head. When the metal taps, don’t let the heat drop faster than forty degrees per minute. Apply your Ringing Sonic Buzzing magic charms to the outer mold frames.”
Shen Yue stepped forward, her hands steady, her pale face lit up by the fire glare. “I’ve timed together three magic charms with the stone ink, Lin Ke. The master interlocks are holding at four hundred cycles per second.”
“Execute,” Lin Ke commanded.
Meng Shan drove the bellows down.
CHUG-CHUG.
A high-pressure jet of vermilion red stone vapor and calcined bone-ash dust roared into the heart of Crucible One.
Inside the watching port, the boiling liquid iron erupted into a mesmerizing display of chemical transformation.
The dull grey melted rock waste foamed wildly. That turned bright emerald green as the catalytic flux stripped the final sulfur molecules from the metal.
The boiling iron puddle brightened from cherry red, through blinding yellow, into a blazing bright, pure solar white.
Lin Ke raised his brass tapping rod.
He didn’t hesitate. He drove the steel point directly into the clay tap-hole with a single, precise hammer blow.
SHUUUUU!
A blinding, liquid torrent of white-gold metal cascaded down the heat-proof runner into the casting molds.
The air in the ward seemed to drop in sky thickness as the pure metal flowed.
There was no smoke. No sulfur stench. Only the crisp, ozone-rich scent of summer lightning and deep-earth minerals.
“Shen Yue! Engage shaking!” Lin Ke shouted.
Shen Yue slapped three crimson-and-black magic charms onto the sides of the three iron molds.
THRRRRRRR!
A high-pitched, ringing hum sang out from the metal boxes.
The liquid iron inside the molds began to ripple with millions of tiny, nested standing waves, shimmering like liquid silver under a tuning fork.
The rapid surface cooling was disrupted. The growing crystal-clear needles shattered and reformed into dense, interwoven feather patterns that swirled across the freezing metal.
Within two minutes, the surface cooled below its liquidus point.
The white-gold bright glare faded into a deep, mesmerizing slate-grey.
Lin Ke stepped forward with heavy iron tongs, unbolting the mold clamps and tipping the three metal bars out onto the damp sand.
CLANG-TING.
The three metal bars hit the ground with the ringing chime of sky chimes.
Meng Shan dropped his bellows handles, stumbling forward and wiping soot from his eyes.
Shen Yue fell to her knees, breathless, staring at the cooling metal with parted lips.
From the doorway of the tool shed, a dry cough broke the silence.
Apothecary He had arrived twenty minutes ago to deliver fresh bone-soothing salve. The old healer stood frozen on the threshold. His quartz glasses slid down his crooked nose. His gnarled hands grabbed his medicine chest so hard the wood groaned.
“By... By the Ancestors’ tombs,” He whispered, his voice cracking.
He walked over to the sand bed, ignoring the scorching heat that blistered the hem of his robe. He knelt down, pulled out his silver-and-jade test probe. Then he touched the tip to the nearest metal bar.
The white jade sphere didn’t just glow.
It erupted into a brilliant, radiant flare of pale silver-blue spiritual soft glow that lit up every soot-stained corner of the Seventh Ward!
The surface of the metal bar was breathtaking.
It was a deep, lustrous gunmetal grey, covered in delicate, rainbow-bright feather dendrites that looked like frost frozen onto a windowpane.
When the light caught the facets, the metal sparkled with innate, spiritual flow rate.
“Ninety-nine point nine percent pure...” Apothecary He stammered, his fingers trembling as he traced the feathered surface. “Grade-3 Feather-Pattern Essence Iron. Only Foundation Establishment elders... With True Fire... How? How did you pour this with coal tailings?”
“Catalytic reduction and sound grain refinement,” Lin Ke said. He took a pair of measuring tongs to verify the space-folding contraction. “Purity ninety-nine point nine two percent. Production cost: about one-point-two spirit stones per hundredweight.”
“One point two spirit stones...” Meng Shan repeated, his voice hushed with disbelief. “Zhao Wuji’s forward cartel is selling standard refined bloom at ten stones. His retail monopoly sells Grade-3 Essence Iron at twenty-five stones!”
“Twenty-five spirit stones,” Shen Yue laughed, a wild, breathless sound of sheer joy. “Lin Ke, we’re rich! We have three metal bars right here—that’s thirty pounds! Worth seventy-five spirit stones!”
“We aren’t going to sell them for twenty-five,” Lin Ke said, his voice flat as an iron ledger.
Shen Yue blinked, confused. “What?”
“If we sell them for twenty-five, we’re just playing by Zhao Wuji’s rules,” Lin Ke said. “We’re going to sell them on the open spot market for eleven spirit stones.”
Apothecary He looked up from the metal bar, his jaw slacker than an unstrung bow. “Eleven stones? For Grade-3 Essence Iron? Boy, you’ll trigger an earthquake in the merchant guild! Blacksmiths will trample each other to buy it!”
“That’s the objective,” Lin Ke replied. “At eleven spirit stones, Zhao’s guaranteed forward contracts at ten stones become worthless. His buyers will cancel their orders to buy our Essence Iron instead. And under Clause 17.B of his own charter, Zhao will be forced to buy every metal bar we tender at ten stones, or lose his eight-thousand-stone collateral in the Sect Treasury.”
“There’s only one problem,” Apothecary He said, his cynical nature reasserting itself as he stood up and brushed sand from his knees. “You can’t sell this under the Seventh Ward’s name.”
Lin Ke looked at the healer. “Explain.”
“Zhao Wuji has three cousins on the Outer Court Commercial Council,” He warned. He pointed a bony finger toward the mountain peaks. “The moment the Seventh Ward logs a single metal bar of Grade-3 Essence Iron on its official manifest, the Council will slap an immediate Monopoly Injunction and Quality Control Sequestration Order on this ward. They’ll impound the metal, lock Crucible One, and tie you up in office litigation for three years.”
The old man shook his head grimly. “To crash Zhao’s market, you can’t be an assistant clerk in the Seventh Ward. You need a shell proxy. An independent entity with an unbeatable, grandfathered trading charter that predates the Grand Fortune Clan’s monopoly.”
Meng Shan frowned. “Where in the outer sect would we find an unbeatable trading charter?”
Lin Ke didn’t frown.
His eyes shifted to Meng Shan’s weathered face, his mind already parsing the sect’s public historical archives at double test model speed.
“We don’t need to find one,” Lin Ke said, a cold, sharp spark igniting in his eyes.
“We just need to wake up an old corpse.”