The gathering at the Gu Clan's main gate was a display of inefficient energy expenditure. Dozens of disciples stood in neat rows, their chests puffed out, radiating their Qi in a flashy, wasteful aura intended to impress the visiting Elder from the Iron-Fist Hall.
Gu Xian stood at the very back, in the shadow of a stone lion. He wore simple gray robes that absorbed the light rather than reflected it.
His eyes, silver-violet and unblinking, dissected the scene.
Target: Elder Tie (Iron-Fist Hall).
Bone density: High. Likely reinforced with a metal-based cultivation art.
Respiratory rate: 12 breaths per minute. Too fast for his cultivation level. Signs of heavy metal poisoning in the lungs.
"The breathing technique of the Iron-Fist Hall creates toxic byproducts," Gu Xian murmured to himself, his voice barely a breath against the wind. "He is dying by degrees. A structural flaw."
"Gu Xian."
The voice was deep, booming like a war drum. It was his father, Gu Tian. The Patriarch stood on the raised dais, his gaze sweeping over the assembled sons. When his eyes landed on Gu Xian, they held no warmth, only a weary resignation.
"You will accompany the third team," Gu Tian ordered. "Your constitution is weak. Do not attempt to mine the Spirit Ores. Simply carry the baskets and observe. Perhaps the air of the mines will... wake you up."
"Understood," Gu Xian replied. His tone was flat, devoid of the shame or anger his father likely expected. To Gu Xian, carrying baskets was simply an exercise in load-bearing mechanics.
Gu Reng, the hot-headed fourth brother, snorted from the front row. "Don't drop the basket, Fifth Brother. It might be heavier than you."
Gu Xian didn't respond. He was busy calculating the tensile strength of the bamboo basket he had just been handed.
The Dead-Zinc Veins were located in a rift valley three hours north of the clan estate. It was a place where the earth seemed to have rotted away; the soil was a sickly gray, and the air tasted of sulfur and rust.
As the expedition descended into the mouth of the mine, the light of the sun vanished, replaced by the flickering, uneven glow of torches and glowing moss.
The other disciples rushed forward, their eyes greedy for the glitter of "Spirit Iron" or "Jade-Core." They struck the walls with pickaxes, shouting whenever they found a rock that glowed.
Gu Xian walked slowly. He let his hand trail along the damp, rough walls of the tunnel.
Geological Stratum: Metamorphic.
Composition: Silicates, trace amounts of zinc, high concentrations of... Aluminum Oxide.
He stopped.
To his left, embedded in a layer of mud that everyone else had ignored, were dull, gray, hexagonal stones. They looked like river rocks—ugly, opaque, and spiritually inert. No Qi radiated from them.
"Trash," a disciple muttered as he squeezed past Gu Xian. "Move, Fifth Young Master. The good ore is deeper in."
Gu Xian ignored him. He knelt down and pried one of the gray stones loose. It was heavy, cold, and hard enough to scratch steel.
Corundum, Gu Xian analyzed. Crystalline form of Aluminum Oxide. On Earth, when transparent and blue, it is Sapphire. When red, Ruby. Here, in its raw, opaque form, it is just 'gray rock' to these fools.
He didn't need pretty gems. He needed the Hardness. Corundum was a 9 on the Mohs scale, second only to diamond.
If I pulverize this into a micro-powder and ingest it with a highly acidic solvent to aid absorption... Gu Xian's mind raced through the chemical equations. I can begin the restructuring of the ribcage. Sapphire-infused bone marrow will withstand 300% more impact force than standard calcium.
He quietly placed the "ugly rocks" into his basket, covering them with a layer of actual dirt to avoid questions.
He continued deeper. The air grew thinner. The pressure increased.
Suddenly, his internal biological alarm triggered.
auditory anomaly detected. Infrasound. Frequency: 17 Hertz.
It was a vibration too low for the human ear to hear, but Gu Xian felt it in his teeth. It was a rhythmic thrum, like a heartbeat buried under miles of rock.
He stopped again. The other disciples were busy fighting over a vein of low-grade Spirit Iron fifty meters ahead. They felt nothing. They lacked the sensitivity.
Gu Xian turned down a narrow, abandoned side-tunnel. The ground here was slick with black sludge. The infrasound grew stronger, vibrating his diaphragm.
He found the source in a pile of collapsed rubble.
It wasn't a treasure chest. It wasn't a glowing sword. It was a lump of metal, roughly the size of a fist, covered in heavy, flaky rust. It looked like a piece of mining equipment that had been left to rot for a century.
Gu Xian reached out.
Magnetic field intensity: Abnormal.
As his fingers brushed the rust, a jolt of pure, cold electricity shot up his arm, bypassing his flesh and striking directly into his nervous system. It wasn't Qi. It was Bio-Electricity.
Gu Xian didn't pull back. His eyes widened slightly—the only sign of emotion he had shown all day.
"A lightning-struck lodestone," he whispered. "Compressed by tectonic pressure for a thousand years. It acts as a natural capacitor."
He grabbed the rusty lump. It was incredibly heavy, far denser than lead.
This is not garbage.
If he could surgically implant shards of this metal into his nervous system, or perhaps dissolve it into a solution to coat his meridian channels, he could increase his reaction speed from "human" to "instantaneous." It was the key to the Thunder-Walking techniques he had theorized but never attempted.
"What are you doing?"
Gu Xian stood up, sliding the rusty lump into his wide sleeve with a fluid, practiced motion. He turned to see Gu Reng standing at the entrance of the tunnel, holding a glowing piece of Spirit Iron.
"I am collecting samples," Gu Xian said, his voice flat.
Gu Reng laughed, kicking the basket at Gu Xian's feet. The gray Corundum stones rattled. "Samples? You're picking up river rocks and rusty junk. Father was right. You really are broken."
Gu Reng stepped closer, his presence imposing, heat radiating from his skin—the sign of inefficient energy containment.
"Throw that trash away," Gu Reng commanded. "We need the baskets for real ore."
Gu Xian looked at the basket of Corundum. Then he looked at Gu Reng.
Calculated probability of conflict: 98%.
Gu Reng's stance: Off-balance. Heavy weight on the left foot.
Solution: Minimum effort.
"No," Gu Xian said.
Gu Reng blinked, stunned by the refusal. His face flushed red. "You useless—"
He reached out to grab Gu Xian's collar.
Gu Xian didn't dodge. He simply shifted his center of gravity two inches to the right and tapped Gu Reng's wrist at a specific angle—the exact point where the ulnar nerve was exposed.
It wasn't a strike. It was a biological hack.
Zap.
Gu Reng's hand went numb. His grip failed before it even connected. He stumbled, his own momentum carrying him past Gu Xian, where he tripped over the very basket he had kicked earlier.
Gu Reng crashed into the mud, face first.
The tunnel went silent.
Gu Xian picked up his basket of "rocks," his sleeve heavy with the rusty capacitor.
"The friction coefficient of the mud is quite low," Gu Xian observed, looking down at his brother. "You should adjust your stance."
He walked past Gu Reng, heading back toward the surface. He had the Sapphire components. He had the Bio-Electric capacitor.
The Expedition was a success. The restructuring of the vessel could now proceed to Phase Two.