The Mark-II Sentinel Mech pivoted, its heavy rotary chainguns tracking a phantom echo in the ruins. Its crimson optic sensor swept across the crumbling ferrocrete pillars, completely missing the shadow pressed tightly against the ceiling of the ruined underpass.
Chen Xi clung to the exposed rebar like a bat, his breathing slowed to a near-stop.
He didn't see a terrifying war machine below him. He saw an assembly of parts, governed by strict, inflexible laws of physics. Years spent in the toxic scrapyards of Sector 4 hadn't just taught him how to strip a chassis; they had forced him to memorize the operational manuals of thousands of Old Era machines.
The Mark-II, Chen Xi thought, his eyes tracking the mech's heavy steps. Mass: 4.2 tons. Center of gravity: dead center of the pelvic chassis. It uses standard gyroscopic balancers. If the external environment shifts its weight distribution by more than thirty percent abruptly, the gyros will overcompensate and lock the knee servos to prevent a catastrophic fall.
He looked past the mech. Hanging precariously above the intersection was a massive, rusted advertising billboard, held up by three thick steel-braided cables attached to a decaying superstructure.
"Sylphe," Chen Xi communicated mentally, his gaze calculating the angles. "What is the structural degradation of the primary load-bearing cable on that billboard?"
"Scanning," Sylphe replied smoothly. "The carbon-steel weave is experiencing 78% oxidative decay. Its current tensile strength is holding approximately 6,000 kilograms of force. It is at the absolute precipice of failure."
Chen Xi smiled coldly. Perfect.
He didn't need to blow the mech up. He just needed gravity to do the math for him. He reached to his shoulder. Wraith, the biomimetic tungsten spider, uncurled its bladed legs.
"Sync optical camouflage to a point-zero-two-second strobe frequency," Chen Xi commanded softly. "Match the refresh rate of the Sentinel's primary optic sensor. Go up, sever the primary and secondary cables at a forty-five-degree angle. Leave the third."
Wraith’s blue eyes flickered as it adjusted its light-bending plating. To the human eye, it became a hazy blur. But to the mech's camera, syncing with the shutter speed meant Wraith literally did not exist in the frames it recorded.
The spider dropped silently to the ground and scrambled up the ruined superstructure with terrifying speed.
Chen Xi dropped from the ceiling, landing softly behind a shattered concrete barrier. He pulled a heavy, cracked iron bolt from his pocket. He didn't use his Kinetic Qi to throw it; he used pure, calculated geometry.
He pitched the bolt in a high arc. It bounced off a rusted metal awning forty yards down the street, clattering loudly into an alleyway.
The Sentinel Mech instantly pivoted toward the sound. Target acquired. Investigating.
It stomped forward, stepping squarely into the center of the intersection. At that exact microsecond, fifty feet above, Wraith drove its tungsten-bladed legs through the decaying steel cables.
SNAP.
The sound was like a cannon shot. The massive, multi-ton billboard swung downward like a colossal pendulum, pivoting violently on the single remaining cable.
The Sentinel's sensors shrieked a proximity warning. Its automated defense protocols kicked in. But just as Chen Xi had calculated, the sheer mass of the incoming billboard triggered the gyroscopic balancers. The mech's knee servos locked into a braced position to take the impact, completely immobilizing it.
The billboard slammed into the mech with the force of a freight train.
Metal shrieked as the 4.2-ton war machine was crushed beneath the rusted iron, its chassis collapsing in on itself. The rotary chainguns misfired into the asphalt before the logic core sparked and died.
To the Academy cameras hidden in the ruins, it looked like a terrifying, spectacular coincidence. A structural failure that crushed a rogue mech just as a terrified cadet was hiding nearby.
Up in the observation deck, Zhao Ming slammed his fist onto the console, shattering the glass. "What the hell was that?! Structural failure? Are you kidding me?!"
"Sir, the Sector is old," the corrupt instructor stammered, sweating profusely. "The vibrations from the mech's footsteps must have destabilized the—"
"Shut up and route the other two Sentinels to his exact location!" Zhao Ming roared.
Down in the ruins, Chen Xi didn't celebrate. His sharp ears picked up the heavy, synchronized thud of two more mechs approaching rapidly from the north. The crash had given away his position.
"They are converging. ETA: forty seconds," Sylphe warned. "You cannot drop another building on them, Chen Xi. It will exceed the statistical probability of a coincidence. The proctors will notice."
"I know," Chen Xi muttered, sprinting toward a nearby sub-basement entrance of a ruined transit station. He kicked the rusted door open and hurried down the stairs into the darkness.
The basement was flooded with a foot of stagnant, oily water. Thick, heavy municipal power cables hung from the ceiling like dead snakes, terminating at a massive, sparking sub-station relay box on the far wall.
This was where Chen Xi’s passion truly lived. He waded into the water, ignoring the foul smell, and ripped the panel off the relay box. He didn't use the Origin Forge. This required surgical, analog precision.
He pulled out his wire strippers and insulated pliers. His hands moved with a furious, loving competence.
"The Academy mechs use Class-4 Surge Protectors," Chen Xi muttered rapidly, stripping a thick copper power line and wrapping it around a secondary grounding node. "If I just drop a live wire into the water, the mechs will detect the voltage spike and ground themselves before they take a step. I have to bypass the protectors."
"By creating an oscillating frequency," Sylphe finished his thought, sounding profoundly impressed. "You are manually wiring an alternating current loop to mimic the diagnostic ping of their own internal batteries. When they step in the water, their systems won't register it as an external threat until the amperage hits the mainboard."
"Exactly." Chen Xi clamped the final wire into place, his hands steady despite the adrenaline. He yanked the heavy primary power cable from the wall and let the exposed end dangle just an inch above the flooded floor.
He scrambled up a rusted maintenance ladder to a catwalk above the water just as the heavy blast doors at the top of the stairs were blown off their hinges.
The two Mark-II Sentinels stomped down the stairs, their chainguns spinning up. Their crimson optics scanned the room, locking onto Chen Xi huddled on the catwalk.
To the cameras, Chen Xi looked like a cornered rat, clutching his multi-tool in absolute terror.
"Please don't shoot! I'm just a logistics cadet!" Chen Xi yelled, putting his hands over his head, an Academy-award-winning performance of panic.
The mechs didn't care. They marched into the flooded basement, splashing through the water, angling their guns upward.
Wait for it, Chen Xi thought, his eyes locked on the exposed power cable dangling near the wall.
Wraith, entirely invisible, dropped from the ceiling and landed on the dangling power cable. With a tiny, precise flick of its bladed leg, the spider knocked the live wire directly into the water.
BZZZZZT!
A blinding flash of blue-white electricity arced across the entire flooded floor.
Because Chen Xi had manually bypassed their surge protectors, the mechs' systems didn't engage their grounding spikes. The massive voltage surged directly through their exposed knee joints, riding the oscillating frequency straight into their logic mainboards.
The mechs spasmed violently. Sparks showered from their chassis as their ammunition belts cooked off, exploding harmlessly inside their armored hoppers. Within three seconds, their crimson optics flickered and died, and both multi-ton machines collapsed face-first into the boiling water, completely fried.
Chen Xi let out a long, shaky breath, letting his shoulders slump in exaggerated relief for the cameras. He slowly climbed down the ladder, carefully avoiding the water, and walked out of the basement.
"Flawless," Sylphe praised, her holographic form appearing on his shoulder, clapping her tiny hands. "You didn't use a single drop of Qi, and you dismantled three lethal war machines with nothing but rust, gravity, and a wire stripper. Zhao Ming must be having an aneurysm."
"He’ll think I'm the luckiest rat in the slums," Chen Xi smirked, retrieving Wraith as the spider scurried up his leg.
But as Chen Xi walked out into the ruined street to find the next broken terminal, the smile vanished from his face. The Stellar Furnace Art circulating in his chest suddenly flared, reacting to a sharp, malicious intent in the air.
"Chen Xi," Sylphe's voice dropped an octave, turning ice-cold. "I am detecting three unregistered biological signatures. They are not wearing Academy transponders. They have bypassed the perimeter lockdown, and they are moving in tactical formation directly toward your position."
Chen Xi stopped in the shadows of an alleyway. He slowly reached down and tapped the release triggers on his wrists. With a soft, metallic snikt, the Viper-Mantis blades extended into his palms.
"Mechs follow logic," Chen Xi whispered, his eyes narrowing into cold slits as his martial arts aura bled into the air. "Assassins don't. The game of hide-and-seek is over."