The "Iron Cathedral" wasn't a church; it was a massive, hollowed-out volcano where the air hummed with geothermal heat. Kaito stood before the Great Anvil, the Dark Nichirin Ore Goro gave him glowing like a dying star.
"I need three hours," Kaito signaled to Ren. His hands were already wrapped in heat-resistant leather. "If the temperature drops, the ore will stabilize into slag. I cannot stop striking until the impurities are out."
Ren looked at the narrow entrance of the forge chamber. Outside, the "Gorges of Great Echoes" were filled with a new, terrifying sound: the high-pitched thrum of vibrating wires.
"Three hours?" Ren unsheathed his needles, his eyes tracking the shadows on the walls. "Fine. But if I die, I'm haunting your new sword, Blacksmith."
The Ambush: The Bleeding Strings
From the darkness, three figures drifted down like spiders. They were the Trio of the Bleeding String. Their fingers were unnaturally long, connected by translucent threads of demon-blood silk that were so sharp they cut the air itself.
"A beautiful rhythm you have here," the lead demon whispered. Its head was tilted at a 90-degree angle. "So steady. So... breakable."
The Battle Begins:
Ren moved first. "Breath of Friction: Second Movement – Searing Cross!" He became a blur of sparks, his needles clashing against the invisible wires. But for every string he cut, two more appeared. The demons weren't fighting him; they were weaving a net around the entire room.
The Forge of Soul
Behind Ren, the sound of the hammer began.
CLANG. CLANG. CLANG.
Kaito wasn't just hitting metal. He was using Breath of the Resonating Metal to pulse his own life force into the dark ore. Every strike sent a shockwave through the room that temporarily disrupted the demons' strings.
Mina stood by the bellows. Her job was the most dangerous: she had to use her "Resonance" to keep the fire at exactly 1200°CIf she faltered, the blade would shatter. Her skin was turning a ghostly, metallic white. She was pushing her demon blood to the limit to protect her brother's work.
The Breaking Point
Two hours in. Ren was bleeding from a dozen shallow cuts. The lead demon chuckled, its fingers dancing.
"Your guard is failing," the demon hissed. "And your sister... her 'song' is fading. Why struggle?"
The demon sent a massive wave of "Scream-Wires" directly at the anvil. Ren was too far away to block. Mina was occupied with the fire.
Kaito didn't look up. He didn't stop his rhythm. As the wires reached for his throat, he shifted his grip on the hammer.
"Breath of the Resonating Metal: Sixth Form – Harmonic Tempering!"
Kaito struck the glowing ore with a force that cracked the anvil itself. A dome of pure, solid sound erupted from the impact. The demon's wires didn't just break—they vibrated into dust.
The Birth of "The Great Bell"
The hammer fell one last time. The light in the room died down, replaced by a deep, pulsing indigo glow.
Kaito didn't have a thin katana anymore. He held a Zanbato-style greatsword—broad, heavy, and etched with the "Sheet Music of the Earth." The blade didn't reflect light; it seemed to swallow it.
Kaito stepped away from the forge, his muscles steaming in the cold air. He looked at the three demons, who were now visibly trembling. For the first time, he didn't look for their rhythm.
He was the one setting the tempo now.
"Ren," Kaito signaled, his eyes cold. "Step back. I want to hear how they sound when they break."
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