The delivery arrived at 3:00 AM, under the cover of a heavy, smog-choked mist.

  There were no formal invoices, no magical seals of approval, and definitely no Academy inspectors. Just a silent nod from two Iron Guild heavy-lifters who dumped a cartload of twisted metal into the back entrance of Sector 4.

  CLANG.

  The sound echoed through the empty warehouse, making us both jump. "It looks like garbage," Amelia whispered, staring at the pile of rusted gears, bent pipes, and corroded plates that now sat on our clean concrete floor.

  "It is garbage," I said, rubbing the sleep from my eyes. I was exhausted, my mana reserves still throbbing with a dull ache from fixing the Crusher earlier that day. "But it's our garbage. And more importantly, it's off the books."

  I walked over and picked up a piece of oxidized copper tubing. It was green with age, brittle, and filled with impurities. If I tried to use this for a high-grade mana conduit, it would explode the moment I channeled a spell through it. It was useless for magic. But for chemistry? It was raw potential.

  "Mark," I muttered, my voice raspy. "[Flag all ferrous materials. Highlight oxidation levels and impurities.]"

  "[Scanning... Material Purity: 42%. Heavy oxidation detected. Refining Required.]"

  "Forty-two percent," I sighed, dropping the pipe back onto the pile. "We have a long night ahead of us."

  "Julian," Amelia asked, picking up a rusted bolt. "How are we going to melt this? The small forge isn't hot enough to process this much bulk. We'd need a blast furnace."

  "I don't have a blast furnace," I said, sitting cross-legged on the floor in front of the scrap heap. I cracked my knuckles. "But I have physics."

  I placed my hands on a rusted iron beam the size of my thigh. "[Skill: Internal Oscillation]" "[Target: Iron Oxide molecular bonds]" "[Frequency: High-Frequency Shear]"

  I closed my eyes and began to vibrate my mana. It wasn't a violent shake. To the naked eye, the beam looked still. But on a microscopic level, I was bombarding the rust with a specific frequency that shattered the bond between the iron and the oxygen.

  A high-pitched whine filled the room, like a mosquito buzzing inside your ear. Slowly, miraculously, red dust began to drift off the metal like snow. The rust flaked away, leaving dull, grey iron beneath.

  Ten minutes passed. Then thirty. The whine became a drill boring into my skull.

  "Julian, your nose," Amelia said, her voice alarmed.

  I touched my upper lip. It was wet. I looked at my fingers—blood. Using my own body as a sonic transducer was taking a toll. My bones ached as if they were vibrating in sympathy with the metal.

  "I'm fine," I gritted out, wiping the blood on my sleeve. "Just... resonance feedback. Keep stacking the clean iron. We can't stop."

  By sunrise, the warehouse looked like a war zone. Red dust covered everything. But in the center of the room, we had three neat piles: Iron, Copper, and Lead.

  "Phase One complete," I rasped, standing up. My legs trembled. "Now, we cast."

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  We fired up the small crucible. Since the metal was now pure, it melted faster. "We need casings," I told Amelia, showing her the blueprint I had drawn on the floor in chalk. "Spherical. Thick-walled. With a reinforced pressure valve."

  "What are we making?" she asked, tilting the crucible. "These look like... ball bearings?"

  "Pressure vessels," I corrected. "For the ammonia."

  Amelia poured the glowing orange liquid into the sand mold I had prepared. The heat hit our faces, dry and searing. We waited for it to cool. I was confident. The math was perfect. The alloy mix was standard carbon steel.

  I picked up the tongs and pulled the first sphere out of the sand. CRACK.

  A hairline fracture appeared down the center of the sphere as soon as the air touched it. "Dammit!" I cursed, dropping it on the table. The metal rang with a dull, hollow thud. Useless.

  "Did I pour it too fast?" Amelia asked, shrinking back.

  "No," I stared at the broken metal, frustration boiling in my chest. I grabbed a magnifying glass. The grain structure of the metal was wrong. It was chaotic, crystallized in strange, swirling patterns instead of a uniform lattice.

  "The mana," I realized, hitting the table with my fist. "The ambient mana in the air. It's interfering with the cooling process. It's shifting the atoms as they settle."

  I rubbed my temples. I had been arrogant again. I assumed earthly metallurgy applied perfectly here, forgetting that Magic was a variable that messed with thermodynamics. In this world, even the air wanted to change the shape of things.

  "We do it again," I said, my voice hoarse. "But I can't do it alone."

  I looked at Amelia. "I need you to cast a shield. Not a physical shield—a mana void. I need you to create a bubble around the mold that blocks all ambient magical energy while it cools. Can you do that?"

  Amelia looked at the mold, then at me. She bit her lip. "A Null-Zone? That's... that's hard to sustain, Julian. It fights against nature."

  "Just for five minutes," I pleaded. "While it sets. Please."

  She nodded, her expression hardening with determination. "Okay. Let's try."

  We poured the second batch. As the iron filled the mold, Amelia raised her hands. A translucent, shimmering bubble enveloped the table. I could feel the air inside go "dead"—the static electricity of the ambient magic vanished.

  Sweat poured down Amelia's face. Her hands shook. "It's heavy," she whispered. " The world wants back in."

  "Hold it," I ordered, watching the metal change color. "Steady... steady..."

  Five minutes felt like five years. "Now," I said.

  Amelia dropped the shield and collapsed into a chair, gasping for air. I reached out with the tongs. I didn't breathe.

  The sphere was smooth. Dark grey. Seamless. I tapped it with my tuning fork. PING. A clear, sustained, beautiful note. No cracks. Perfect structural integrity.

  "It holds," I breathed out, leaning heavily against the workbench, a grin breaking through my exhaustion. "It holds pressure."

  We spent the rest of the day in a rhythm of pour, shield, cool, repeat. We didn't make swords. We didn't make flashy magical staffs. We made seventy-five pressurized canisters, each one filled with the volatile Haber Process ammonia gas we had synthesized.

  To an outsider, they looked like industrial junk. Replacement parts for a steam engine, or maybe weights for a pulley system. Camouflage.

  "Julian," Amelia asked quietly as we packed the last crate, wrapping the spheres in straw. "Will these really stop them? If the High Inquisitor comes back... she's Level 60. She can melt steel with her mind."

  I looked at the heavy, innocent-looking spheres. They weren't magical nukes. Against a Level 60 mage with a shield up, they might only be an annoyance. But physics had a way of bypassing shields if you were creative. And ammonia didn't attack your mana; it attacked your lungs, your eyes, and your mucous membranes.

  "I don't know," I admitted honestly. I wasn't going to lie to her. "If Voss wants to kill us, she can. But these aren't for killing her."

  I picked up one of the canisters, weighing it in my hand. It was cold and heavy, a promise of violence wrapped in steel. "These are for leverage. Mages are used to fighting magic. They shield against fire, against lightning, against force."

  I placed it in the box. "They aren't used to fighting chemistry."

  "[System Alert]" "[Crafting Complete: Volatile Gas Canister (Grade D)]" "[Quantity: 75]" "[Engineering Proficiency: +12%]" "[Mana Exhaustion Warning: Critical.]"

  I closed the crate lid. "We have the ammo," I said, looking at the setting sun through the dirty warehouse windows. The light turned the floating dust into gold. "Now we just need a delivery system."

  "The Golems?" Amelia guessed.

  "No," I smiled wearily, wiping a smudge of soot from my cheek. "Golems are too slow. And they're ground-based. Voss will expect an attack from the ground."

  I looked up at the rafters, where the birds were nesting. "We need something that flies."