Silence dominated the absolute white space of the Void Vault.
Near the perimeter of the room, Garrick slept the deep, restorative sleep of the dead.
His breathing was slow but incredibly steady, echoing faintly against the polished marble floor. His surviving crew members lay scattered on conjured cots nearby, equally unconscious. Their battered bodies were desperately recovering from extreme physical exhaustion and total mana depletion, passively soaking in the dense, healing emerald Quintessence that hung thick in the air.
And at the absolute center of it all—
Lencar Abarame stood completely alone.
He was currently functioning on a dangerous, intoxicating cocktail of adrenaline, residual anti-magic stimulation, and an obsessive, burning curiosity.
In front of him, hovering obediently at chest height, his thick, black Logoless Grimoire floated silently. Several newly minted pages were now filled. They weren't filled with standard offensive spells or flashy elemental attacks. They were filled with something far more foundational, and exponentially more valuable.
Structures. Geometric runes. Fragments of an older, purer operating system of reality.
"There is enough data for preliminary testing," Lencar murmured, his voice sounding dry and incredibly loud in the empty room.
He raised his right hand, his bruised, leather-clad fingers twitching slightly. He didn't summon an explosive burst of fire, nor did he conjure a howling gale of wind. He gathered his mana with pinpoint, surgical precision. It was measured. Calculated to the exact decimal.
From the shadowy depths of his dimensional storage, another presence abruptly appeared in the physical world.
It manifested with a heavy, oppressive thud of displaced air, floating horizontally in the space directly in front of him.
It was a sword.
It was massive, broad, and deeply ugly. The metal was black, heavily worn, and caked in centuries of grime and dried dirt that refused to wash off. It looked impossibly heavy, like a slab of dark iron torn straight from the foundation of a ruined castle. Yet, despite its brutal, blunt appearance, it was strangely, terrifyingly silent. It didn't hum with mana like a normal magic item. It swallowed the ambient light around it.
The Demon Dweller Sword.
It was a weapon that simply should not exist within the normal, established logic of the continent's magical paradigm. It was a relic of the ancient Elf Tribe, corrupted by the despair of a devil, and currently bonded to Lencar.
It was a weapon that—even in its currently incomplete, unawakened state—fundamentally broke the rules.
Lencar observed the hovering black blade quietly, crossing his arms over his chest.
He knew exactly what the sword could do in its factory-default state. It could physically nullify and cut through incoming magic. It could absorb residual anti-magic and release it as highly destructive, ranged slashes. And, most uniquely, it could interact with external mana in highly unusual ways.
But for Lencar, a man attempting to rewrite the very fate of the world?
That simply wasn't enough.
Lencar's pale eyes narrowed slightly behind the cracked wood of his mask.
"…There was more to it than just brute-force cancellation."
Fragments of memory from his past life as Kenji Tanaka surfaced in his mind. He wasn't remembering his own experiences, but panels of ink and paper. He remembered observing a recorded, fictional battle that had taken place in a Kiten Dungeon. Asta without a single drop of magic. A Noelle with immense, overwhelming water mana. And this exact sword—
That had connected them.
"It can cause external mana resonance," Lencar whispered, the pieces falling into place.
The Demon Dweller Sword had once drawn massive amounts of power directly from another allied mage. It hadn't done it by force, like a parasite draining a host. It had done it by alignment. It had synchronized with the Noelle's water magic, coating the anti-magic blade in a surging torrent of liquid power. Later, it had done the exact same thing again during an invasion, but at a much larger scale, linking with a Gauche to multiply itself.
"…So the foundational function for storage and connection already exists within the blade's architecture," Lencar concluded, his mind racing. "But it is currently incomplete. It requires specific emotional resonance and a willing ally to trigger organically. I don't have the luxury of waiting for the power of friendship."
Lencar extended his hand toward the floating grimoire.
The heavy book snapped open. The thick parchment pages flipped rapidly before stopping. The glowing, green organic rune he had successfully stabilized earlier—the infinite loop construct—appeared brightly on the page.
"Let's see what happens when I integrate it into the sword."
The rune lifted slowly from the physical page. It didn't manifest as ink, but as a three-dimensional, glowing construct of pure, highly condensed mana structure. It floated gently through the air, moving deliberately toward the heavy black blade of the Demon Dweller Sword.
The sword reacted instantly to the approaching magic.
A deep, violent, grating vibration passed through the heavy iron blade. It sounded like two massive tectonic plates grinding together. The green rune touched the rusted surface of the metal—
And was immediately repelled.
"It was rejected," Lencar noted, remaining perfectly still.
He observed the reaction carefully. The sword wasn't just passively ignoring the structure. It was actively fighting it. The innate anti-magic property of the blade was attempting to violently erase the very concept of the rune before it could bind to the metal.
"It is because of the Incompatibility of format."
The ancient rune had been expressly designed for conventional, natural magic flow. It relied on the push and pull of positive mana. The Demon Dweller Sword—by its very dark, corrupted nature—operated entirely outside of that natural system. It was a black hole.
"Manual adjustment is needed here."
Lencar didn't recall the rune. He modified the structure mid-air. Using his Stage 3 Peak mana like a microscopic pair of tweezers, he began stripping away the unnecessary, outer layers of the spell. He removed the elemental intake valves, leaving only the bare, reinforced skeletal core of the infinite loop.
Then—he tried pushing it into the blade again.
The stripped-down rune merged with the metal.
This time—it held.
For exactly three seconds.
Then—the heavy black sword pulsed violently, a sickening black-red aura flashing across its surface.
CRACK.
The green rune shattered completely, exploding into a shower of magical sparks that instantly dispersed and dissolved into the sterile air of the vault.
"It was catastrophically unstable," Lencar murmured. He didn't flinch. He remained entirely unmoved by the failure. " As expected."
He raised his right hand again. Another, slightly different rune lifted from the pages of his grimoire.
This time—it was a heavily modified structure. Lencar had simplified the geometry, making it far more adaptive and fluid, rather than rigid and demanding.
"Second attempt."
The new rune pressed into the blade. It integrated. The sword vibrated aggressively again, emitting that awful, grinding hum, but it was noticeably less violent than the first attempt.
The loop successfully activated. Lencar could see the faint, glowing lines of the circuit trace themselves along the dirt-caked fuller of the blade. A tiny, microscopic sliver of ambient mana began circulating within the weapon.
"There is finally progress."
But then—just as quickly as it started, the circulation sputtered and died. The loop collapsed inward, erased by the sword's natural aura.
"It still failed."
Lencar's gaze sharpened, his analytical mind kicking into overdrive.
The underlying problem wasn't the geometric rune itself. The problem was the fundamental interaction between the two forces. The Demon Dweller Sword simply wasn't designed to comfortably store mana. Its primary, overriding directive was to reject and cancel accumulation. It was built to act as a void, not a battery.
"…If I can't overwrite the primary directive… then the new function must be layered beneath it."
Lencar's hands moved rapidly. He pulled a second, entirely different rune from his grimoire. It was the fragmented, highly geometric one he had fixed first. The rune specifically designed for structural mapping and recognition.
"If cancellation remains the primary, instinctual action of the blade." Lencar reasoned out loud, his eyes tracking the glowing lines. "…then storage and retention must become a secondary, passive byproduct."