I Transmigrated Into the Game as the Luckiest Extra

And loopholes were meant to be exploited. His heart didn't just pound; it thrummed a frantic, exhilarating rhythm against his ribs, a war drum heralding not fear, but the thrill of imminent discovery. This wasn't just breaking a rule; it was shattering a fundamental law of reality as this world knew it. The very air in the stone-walled chamber seemed to hold its breath in anticipation.

"System," Kael commanded, his voice a low, steady hum that belied the tempest of excitement within him. "Purchase one empty box. Standard quality. Also, add an isolation spell to the interior."

The system's response was instantaneous, crisp, and clean, cutting through the silence of the dungeon.

Ding! Ding! You have purchased: Empty Box [For Isolation].

Ding! Ding! Isolation Spell has been cast inside the box.

With a deliberate slowness, Kael Vi-rel reached out and picked up the newly manifested item. It was deceptively simple, a plain wooden container no larger than his two hands put together. He turned it over, inspecting every grain of wood, every perfectly joined corner. It felt mundane, yet it held the potential for something truly revolutionary.

[Empty Box – For Isolation] An easily breakable, man-made box with no significant properties. Currently imbued with an Isolation Spell to prevent external interference.

A slow grin spread across his face, stretching his lips until they felt tight. It wasn't a smile of simple happiness but of predatory satisfaction. His eyes, usually a calm and calculating shade, now gleamed with a dangerous, almost manic light. "Hehe… with this, it won't just be a minor error in the system's logic. It'll be a major bug. A glorious, world-breaking loophole that no one else can even dream of exploiting."

The very idea sent a jolt of pure adrenaline racing down his spine, a current of raw power that made the hairs on his arms stand on end. The dungeon around him its cold stone, its faint scent of moss and decay suddenly felt too small, too fragile and mundane, as though he were a giant standing in a dollhouse, poised on the edge of something immeasurably vast.

With his unnaturally potent luck and a relentless determination that bordered on obsession, Kael Vi-rel wasn't just playing the game anymore. He was taking the source code, tearing it to shreds, and rewriting it from scratch.

And Kael Vi-rel had no intention of playing fair.

His hands trembled, just slightly, a minute tremor born from a mix of exhilaration and extreme focus as he guided the roiling, distorted space toward the waiting box. His breath came slow and heavy, a controlled rhythm in his chest, each exhale a conscious effort to steady his nerves. The chamber around him groaned, a low, resonant creak as if the ancient stones themselves were straining under the weight of the warped reality he was forcing into order.

The distortion pulsed like a living, malevolent thing. It was invisible to the naked eye, a void in perception, yet Kael could feel its presence with every fiber of his being. Its sharp, fractal edges brushed against his skin like blades of invisible glass, while shifting currents of force tugged at his fingers like an angry, unseen tide. The air shimmered violently, warping in sickening waves that bent the torchlight into unnatural, kaleidoscopic patterns.

One wrong move, one momentary lapse in his concentration, and the delicate balance would shatter. The entire chamber could collapse into a singularity, and he wasn't entirely certain even his unique [Space Control] skill could save him if that cataclysmic event happened.

"Gently… gently…" Kael muttered, his voice a strained whisper that was nearly swallowed by the oppressive silence. Sweat beaded on his brow, tracing a path down his temple and dripping from his jaw.

The distorted spatial fragment resisted his will like a wild beast unwilling to be caged. It fought back, lashing out with waves of pressure. Kael's entire focus narrowed to a single, razor-sharp point. He clenched his teeth, the muscles in his jaw aching as he reinforced his control with every ounce of concentration he possessed, channeling his will into a tangible force.

"Not yet… hold… just a little more…"

The box before him on the stone pedestal pulsed faintly, the nearly invisible runes etched along its inner surface now glowing with the soft, blue hum of the isolation magic. The containment enchantments were primed and ready all they needed was for him to guide the anomaly inside without letting it tear itself, and him, apart.

His hands moved with painstaking, agonizing precision. Slowly… carefully… He nudged the chaotic energy past the lip of the box.

Click.

The lid sealed shut with a sound that was both utterly final and terrifyingly quiet.

For a single, drawn-out heartbeat, absolute silence fell. Kael froze, his heart hammering against his ribs, every muscle locked tight.

Then—

Ding! [Potion Box with Space] of class [Rare] Grade has been sealed and created.

Ding! Ding! You have achieved a great success!

Ding! [Rare Grade Item Created] Title Acquired: [Rare Grade Creator] A Rare Grade item has been created in a way that has never existed in any setting of the game or this world.

Ding! You have unlocked the Achievement Classification Rating: [History].

The tension snapped. Kael collapsed backward onto the cold, unforgiving floor, his legs giving out from under him. He gasped for air, his lungs burning as if he'd been holding his breath for an eternity. His entire body felt like jelly, every muscle screaming in protest from the monumental strain of the delicate task.

"Phew…! I thought I was going to die of a heart attack if I failed to put it in the box."

For a long moment, he just lay there, the damp chill of the stone seeping into his clothes, staring at the sealed box as though expecting it to suddenly crack open and undo all of his monumental effort. But it stayed shut. Solid. Contained. Perfect.

A laugh bubbled up from deep within his chest, shaky at first, then growing stronger. He pushed himself to his feet, muscles still trembling, and threw his fists into the air with a surge of pure elation.