The darkness of the drainage tunnel offered no safety. It only offered a focal point for the apocalypse happening behind us.

  The Centurion sprinted, its metal feet tearing chunks out of the concrete floor. The V8 engine screamed, pushed to its absolute limit, the sapphire crystals glowing so bright they illuminated the rushing water beneath us in flashes of strobing blue.

  "Faster!" Rax roared, his hands gripping the roll bar until his knuckles turned white.

  "I'm at redline!" I yelled back, my eyes fixed on the tiny prick of moonlight at the end of the two-mile tunnel.

  Then, the Grand Caldera finally breached.

  We didn't hear the explosion first. We felt it. A pressure wave hit the back of the mech like a physical wall of solid iron. The temperature inside the cockpit spiked instantly. The rearview camera feed turned into a wall of blinding white static.

  "Shockwave!" I screamed.

  The physical force of the expanding steam and detonating mana was funneling directly down the tunnel behind us. It was traveling faster than sound. It was traveling faster than we could ever run.

  If I kept the transmission engaged, the sheer concussive force hitting our rear would shear the gears, lock the legs, and crush us into a cube of scrap against our own momentum.

  I didn't try to outrun it. I used it.

  I slammed my foot on the clutch, disengaging the Type-4 transmission completely. I pulled the hydraulic levers back, forcing the Centurion into a rigid, kneeling crouch, maximizing the surface area of our heavy back armor.

  "Brace!"

  The shockwave caught us. The fifty-ton machine was picked up like a child's toy. We didn't run. We were fired out of the tunnel.

  The Centurion skidded forward on its armored knees, metal screaming against concrete. Sparks showered the cockpit in a blinding waterfall of yellow light. The noise was absolute, a sustained roar that vibrated deep in my teeth and rattled my brain against my skull. The heat was suffocating.

  Three seconds. Four. Five.

  We burst out of the tunnel mouth, airborne for a terrifying, weightless moment, before crashing down onto the desolate, slag-covered wasteland outside the industrial zone. We tumbled once, a violent roll that shattered the remaining external sensors, before the Centurion finally ground to a halt, burying its shoulder deep into a dune of black ash.

  Silence.

  A heavy, ringing silence filled the cockpit. I gasped for air, tasting copper and ozone. The emergency lights were flickering. The engine was idling, but it sounded ragged.

  "Status," I croaked.

  "Alive," Amelia whispered. She was trembling, but she was already running her hands over the distributor, stabilizing the mana flow to the engine.

  Rax didn't answer. He just kicked the hatch open. Thick, black smoke drifted into the cabin.

  We unbuckled and climbed out onto the scorching hot armor of the mech. The back plating was warped and blistered, the paint completely burned away.

  We turned to look back.

  The Grand Foundry was gone. In its place, a colossal pillar of superheated white steam and toxic green mana rose into the night sky, blooming into a terrifying, luminous mushroom cloud. The shockwave had shattered the Absolute Defense Barrier, turning its indestructible magical runes into a million pieces of high-velocity shrapnel that had leveled the surrounding assembly lines. Fires raged across a two-mile radius. Secondary explosions popped like fireworks as smaller boilers and mana-reserves cooked off.

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  Rax reached into his pocket with a shaking mechanical hand, pulled out a crushed cigarette, and lit it off a piece of glowing hot slag resting on the mech's shoulder. He took a deep drag and blew the smoke into the black snow. "Kid," Rax said, his voice unusually quiet. "You just wiped out ten percent of the Empire's industrial capacity with a bent pipe."

  I looked down at the ruined, sparking armor of the Centurion. "And it cost us our stealth. We're a beacon now."

  Meanwhile. The Inner City. The Spire of the Arch-Mage.

  The room was a sanctuary of white marble and gold, untouched by the grime of the Rust Yard. Arch-Mage Vane stood by the floor-to-ceiling window, looking south. Even from ten miles away, the green glow of the burning Foundry painted his pristine face in sickly hues.

  The heavy oak doors burst open. A senior Imperial Tribune rushed in, dropping to one knee. His uniform was immaculate, but his face was slick with cold sweat.

  "Report," Vane commanded, not turning around. His voice was smooth, cultured, and devoid of panic.

  "My Lord," the Tribune stammered. "The Grand Caldera is... gone. The primary processing facility is a total loss. Project Chimera's raw material supply chain has been severed."

  Vane frowned slightly. "A dragon? Or has the Northern Rebellion finally deployed a strategic tier spell? Tell me the mana signature of the attack."

  The Tribune swallowed hard. "That... that is the issue, My Lord. The diviners have scanned the epicenter. There is no offensive mana signature."

  Vane turned slowly. His piercing blue eyes locked onto the kneeling man. "A facility protected by a Tier 4 Absolute Defense Barrier does not simply cease to exist without magic. Explain."

  "The barrier was intact until the moment of the internal explosion, My Lord," the Tribune said, his voice trembling. "Initial forensic divination indicates that the primary steam exhaust valve of the Caldera was... physically crushed. And then welded shut. From the outside."

  Vane stared at him. The silence in the room grew heavy, suffocating. "Welded?" Vane repeated the word as if it were an insult. "Someone defeated my finest Abjuration masters... with a welder?"

  "The survivors reported a machine, My Lord. A heavy walker, unshielded, unregistered. It simply ignored the Guard's fire spells, crushed the valve, and left. The resulting thermodynamic overpressure turned the defense barrier into a containment vessel for a steam bomb."

  For the first time in a decade, genuine fear touched Arch-Mage Vane's heart. It wasn't fear of a stronger mage. He understood magic. He could counter magic. He didn't understand this. He didn't understand an enemy that looked at the laws of arcane reality and bypassed them entirely with the mundane laws of physics. It was a paradigm he could not control.

  He turned back to the window, his knuckles white as he gripped his staff. "The rogue student," Vane whispered to the glass. "Julian."

  "My Lord?"

  "Activate the Iron Inquisitors," Vane ordered, his voice dropping to a deadly, cold register. "All of them. I don't care about the collateral damage. I want that machine found, I want it dismantled, and I want its pilot brought to me. Alive, if possible. But bring me his hands either way."

  Sector 9. The Wastelands.

  The Centurion limped. The right knee actuator was grinding, leaking hydraulic fluid into the ash. We were moving at a crawl, heading deeper into the uncharted badlands away from the city.

  We sat in the cockpit, exhausted, battered, but alive. The silence had returned, but it wasn't the peaceful silence of the morning. It was the heavy silence of refugees.

  Amelia was bandaging a cut on my forehead. Her touch was gentle, but her eyes were scanning the dark horizon. "They'll send an army now," she said. It was a fact, not a complaint.

  "They will," I agreed, looking at the blinking warning lights on the dashboard. "We can't fight an army in this. The armor is compromised. The joints are failing. We've pushed the scrap-metal design as far as it can go."

  I reached into the storage compartment and pulled out a rolled-up topographical map of the continent. I spread it over the control console. I drew a line from our current position, far past the Imperial borders, into a vast, blank area labeled Hazardous Terrain - Unclaimed.

  "The era of hiding in sewers is over," I said, tapping a specific coordinate. "We need a forge. We need heavy machinery, raw iron, and a place where the Empire's magic doesn't work well."

  Rax leaned forward, squinting at the map. His mechanical eye whirred. "The Abyssal Digs," Rax read the location. "Kid, that's a graveyard. The old dwarven deep-mines. It's a lawless hole filled with mercenaries, mutants, and toxic gas."

  "It's also the largest unmined deposit of titanium and tungsten on the continent," I said, looking up at them. "And it's completely immune to Imperial surveillance."

  I placed my hand on the cracked dashboard of the Centurion. "We used their train. We blew up their factory. Now, we're going to build our own. We're going to The Digs. And we're going to build a base."