A Shadow Game

The gunpowder smoke in the tunnel had yet to disperse. Lin Xiu pressed his back tightly against the twisted rail wreckage, the shoulder plates of his Nano Armor still hissing with blue smoke. The air reeked of scorched metal.

The Oracle System's tactical grid flickered across his retina, red markers showing that the Iron Shadow Squad's flashlight beams had closed to within thirty meters.

The faint white light pierced the darkness, casting swaying shadows across the walls.

Meanwhile, the abnormal ionosphere fluctuations at the far end of the tunnel were intensifying—J-09 clearly would not send only one Rift Hunter.

"Oracle, analyze the Iron Shadow Squad's movement patterns." He lowered his voice. The tiny microphone at his throat relayed the command into the armor's core, his tone deep but carrying a faint tremor of tension.

The Nanite Swarm seeped from his fingertips into the ground, weaving imperceptibly thin silver threads through the gaps in the rails. Like a spiderweb, they spread silently, trembling slightly as they sensed every footstep.

"The four targets are advancing in a fan formation. Thermal imaging sensitivity is moderate. Sonic positioning devices are not active." As the mechanical voice fell silent, the Tesseract fragment in Lin Xiu's palm suddenly grew hot. Divine-metal debris burrowed into the wristguard interface like living things, and a faint current ran across his skin. "Energy Resonance detected. Immediate execution of the camouflage plan is recommended."

His pupils contracted slightly, his heartbeat quickening in his chest. All he could hear was his own heavy breathing and the approaching footsteps in the distance.

When he triggered quantum entanglement at Brooklyn Laboratory three days ago, he never could have imagined that the experimental core once used to verify nanoscale self-assembly would become his trump card for surviving in the cracks of the Marvel universe.

He tapped his shoulder plate with a fingertip, and the Nanite Swarm hidden within the armor's patterns moved at once—half slithered across the Rift Hunter's remains, consuming the remaining Chitauri alloy; the other half rapidly climbed the tunnel wall, gathering around the bend twenty meters away into a hazy human silhouette.

"Heat source at the bend!" The Iron Shadow Squad's captain shouted, raising his thermal imager. When its beam swept over the false silhouette, the device emitted a shrill buzz, like both an alarm and a frantic heartbeat.

All four agents raised their guns at once. The white beams of their tactical flashlights tore through the darkness, revealing the combat uniform patterns of one of their own—S.H.I.E.L.D. special-operations markings precisely replicated by Lin Xiu's Nanite Swarm, down to the fabric's sheen and folds.

"Hold your fire! Friendly!" The deputy captain's voice trembled with tension, his tone full of hesitation and unease.

Lin Xiu watched the flickering markers in the tactical grid, a nearly imperceptible curve touching his lips.

The agents' breathing was accelerating, and their heartbeats came clearly through the Nanite Swarm's vibration sensors—fear was easier to manipulate than bullets. Every breath echoing through the depths of the tunnel only magnified their anxiety.

"Move!" The captain kicked aside a piece of metal debris and charged toward the bend, the sound of his boots striking the rails echoing endlessly through the narrow space.

The footsteps of the four men stirred up echoes in the tunnel and gradually faded away.

Taking the chance, Lin Xiu rolled into the drainage ditch beside the tracks. Cold water instantly soaked his pant legs, and the stench of mildew mixed with rust hit him in the face.

The Nanite Swarm spread into a thin membrane behind him, instantly concealing his heat signature.

"Mia Chen's location?"

"Southeast, seventy-two meters away. She is moving toward the ventilation shaft." The Oracle's report made Lin Xiu's fingers pause.

When the blast had knocked off her cap earlier, he had caught a glimpse of the S.H.I.E.L.D. imprint on her tactical vest—a former agent now appearing here as an independent consultant. That could not be a coincidence.

A metallic scraping sound suddenly came from the other side of the tunnel, sharp as fingernails dragging across steel.

Lin Xiu looked up just in time to see Mia crouching as she crawled into a ventilation duct. The hem of her trench coat was stained with purple energy residue from the Rift Hunter, faintly glowing.

Her movements were swift but cautious, her right hand constantly resting at her waist. The bulge there did not look like an ordinary weapon—it might have been a signal jammer, or perhaps a recording device.

"Melvin Carson has left the ventilation shaft." The Oracle's notification tightened Lin Xiu's nerves once more.

That hacker had remained hidden by the vent recording throughout the battle. By now, the footage had probably been uploaded to the dark web.

He touched the miniature receiver implanted behind his ear and, sure enough, heard a dark web forum notification—the post titled Mystery Warrior vs. Chitauri Invader was being reposted like mad. In the attached preview, the moment his lightsaber pierced the Rift Hunter's core had been clipped into an animated image, with battle sparks still flickering at the edges.

"Deal with what's in front of me first." Lin Xiu ground his molars and crawled deeper into the tunnel along the drainage ditch.

The entrance to the maintenance passage was hidden beneath the third section of track. During his survey of the subway system three days ago, he had used the Nanite Swarm to corrode the cement seal.

Now, under the swarm's gnawing, the metal cover quietly loosened. Mildew and rust rushed out at him, carried by damp air thick with dust.

"Low-Grade Tesseract energy fragment detected." The Oracle's voice abruptly rose, and the energy bar on his retina began jumping wildly.

Following the signal, Lin Xiu brushed away the accumulated dust. A thumb-sized diamond-shaped crystal was embedded in a crack in the wall, its surface flowing with an eerie blue radiance. It resonated at the same frequency as the fragment in his palm, buzzing and trembling like some kind of summons.

He took a deep breath and pressed the crystal against the energy interface on his wristguard.

The Nanite Swarm surged out like a tide, instantly enveloping the crystal. Golden patterns spread from the interface across the entire armor, gathering at the shoulder plates into the shape of Norse runes that radiated faint warmth.

"The fourth stage of Tactical Form has been preliminarily activated—swarm units can simulate light defensive structures." The Oracle's message made Lin Xiu's heartbeat skip.

The last time his form had upgraded was when he fought the first Chitauri scout. But this time, he could clearly feel the Nanocore becoming more tightly entangled with Tesseract energy, as though an invisible thread were dragging him into a much larger game.

"Warning: Three energy sources detected approaching." The Oracle's red alert suddenly covered the entire tactical grid.

Lin Xiu spun around. Footsteps sounded from the other end of the maintenance passage—it was the Iron Shadow Squad. They had clearly realized they had been fooled and switched to cross-pattern infrared scans. Static crackled from the ventilation ducts, which was likely Mia. But what made the hairs on his neck stand up was the familiar ionosphere fluctuation at the end of the tunnel—J-09's second wave of attacks had arrived.

"Having fun?" The sudden male voice made Lin Xiu's pupils shrink.

He turned and saw the Iron Shadow captain standing at the entrance to the maintenance passage with a sonic positioning device in hand. His silhouette was clearly displayed on its screen. "Thermal imaging can fool rookies, but not us."

Lin Xiu's fingers tapped rapidly over his armor as the Nanite Swarm climbed the walls toward the tunnel's overhead lighting system.

The next second, every bulb flared to life at once, then went dark within 0.3 seconds. This repeated three times.

As blinding light and darkness alternated, the shadows cast by the tunnel pipes stretched into twisted human shapes, as if ghosts were watching from the corners. It sent a chill down the spine.

"Back off!" The deputy captain pointed his gun at the shadows, his voice shaking visibly.

Taking the opportunity, Lin Xiu slipped out through a ventilation opening beside them. As he passed the captain, he lowered his voice and said, "You're not my match."

When the Iron Shadow Squad's flashlights came on again, only fragments of the Nanite Swarm remained scattered across the tunnel floor, arranged into a taunting smiling face as though still mocking their failure.

At the same time, a new message popped up on an underground dark web forum.

Melvin Carson stared at his computer screen as a private message from an anonymous buyer appeared in the chat window: "One hundred thousand dollars for his facial data. Biological information preferred." He licked his dry lips and replayed the battle footage. In the recording, at the moment the mysterious warrior turned, half of a face seemed to be reflected in the visor's glare.

In an apartment somewhere in Brooklyn, Mia Chen tucked her earphone wire into her ear. Her phone was repeatedly playing the Chitauri transmission she had intercepted while fleeing: "Homologous energy carrier successfully located. Prey retrieval priority upgraded to Class A..." She stared at the words "energy carrier" on the screen, her fingers slowly clenching. The miniature tracker in the inner pocket of her trench coat flashed red—it was something she had modified from Nanite Swarm fragments while Lin Xiu was not paying attention.

The alarms in the tunnel gradually faded, and the subway system's emergency lights came back on, their soft, cold glow spilling across the empty tracks.

A battle video uploaded by an anonymous account was spreading wildly online, titled A Mysterious Warrior Appears Beneath New York: He Looks More Like the Future Than Iron Man.

The likes in the comments section skyrocketed like fireworks. No one noticed that in the shadows of the video's final frame, a pair of golden eyes was staring into the camera—the mark of Balder Armor's Oracle Form, and a sign that the web of fate was tightening.