The emergency stairwell on the 45th floor was eerily silent, bathed in the sickly crimson glow of the backup lighting. Arthur Vance sat on the concrete landing, his back resting against the heavy steel door that separated him from the enraged, bellowing Orc War Chief. Every so often, the heavy thud of the boss’s battleaxe smashing into the impenetrable barrier vibrated through the steel, shaking dust from the ceiling.

Arthur didn't care. The barrier was an absolute absolute state generated by the Eternity Engine. Unless the boss fulfilled its defeat criteria, or Arthur triggered another spatial overflow error, neither could cross that threshold.

He crossed his legs, placing the `[Corrupted Dev Tool Fragment]` on his lap. It was little more than a jagged shard of obsidian glass, its surface cracked and bleeding erratic lines of luminous red code.

Arthur’s heart hammered against his ribs. In his previous life, he had spent a decade climbing to the absolute zenith of the System hierarchy. He had acquired legendary artifacts, slain world-ending calamities, and commanded magic that could reverse time itself.

But he had never held a piece of the System’s base architecture.

"Let's see what you can do," Arthur whispered, his voice hoarse.

He reached out and tapped the cracked glass surface. It felt warm, almost humming with latent, unstable energy. As his skin made contact with the item, a tiny, translucent gray window popped up in front of his face. It wasn't the standard blue or gold System prompt. It looked archaic, like a command prompt from an operating system built in the 1990s.

`[C:/ETERNITY_ENGINE/FRAGMENTS/DEV_INTERFACE.EXE]` `[INITIALIZING...]` `[WARNING: MISSING CORE DIRECTORIES. FUNCTIONALITY LIMITED TO 0.0004%]` `[AWAITING TARGET SELECTION]`

Arthur let out a slow, breathy laugh. Functionality limited to 0.0004%. To a normal Player, this item would be worse than useless—a corrupted piece of junk that took up inventory space and attracted elite Sentinels. But to Arthur, an analyst who had dedicated his original life—and his current regression—to dissecting the System’s underlying logic, that fraction of a percent was a master key.

He needed a target to test it. He looked around the stairwell. Lying a few feet away, discarded by some unfortunate maintenance worker before the Integration, was a simple, flathead screwdriver.

Arthur picked it up. In the context of the Eternity Engine, it was classified as a `[Poor Quality Tool]`, utterly useless for combat, boasting maybe 1 point of durability before it would shatter against a monster's hide.

He held the screwdriver in his left hand and pressed his right thumb against the red, bleeding code of the Dev Tool Fragment.

"Select target," Arthur commanded.

The archaic gray window flickered. A scan line of pale light washed over the screwdriver.

`[TARGET ACQUIRED: 'FLATHEAD SCREWDRIVER']` `[CLASSIFICATION: NON-LIVING MATERIAL/BASIC]` `[OPENING HEX EDITOR...]`

Suddenly, the space around the screwdriver distorted. A torrential cascade of glowing, green hexadecimal characters—zeros, ones, and letters from A to F—spilled out into the air, wrapping around the tool like a digital cyclone.

Arthur squinted, his mind racing to translate the raw code into functional mechanics. He had spent years analyzing the System's structural logic, but seeing it laid bare in its most primitive form was dizzying.

"Line 0x0A4B," Arthur muttered, his eyes darting across the floating text. "That's the entity identifier. Line 0x22FC... material density array. And there... Line 0x88AA."

He reached out with a trembling finger, not touching the physical screwdriver, but gently tapping the floating green hexadecimal string at `[Line 0x88AA: 00 00 00 01]`.

That was the item's durability value. One. Meaning one strike, one use, and the item would break, registering a 'Destroyed' state in the System's garbage collection loop.

With the Dev Tool active, Arthur found he could interact with the string. It was sluggish, resisting his input as the corruption within the glass shard fought his commands, but he forced his will upon it.

He concentrated, his mind wrestling with the raw data. He didn't try to change the item's classification to a `[Legendary Sword]` or alter its damage output. Doing so would initiate a cross-reference check with the System's main servers, flagging the massive discrepancy and summing an Executioner Sentinel directly to his location.

Instead, he aimed for a logic loop. An integer underflow.

He pushed his finger against the `01` in the durability value. He didn't try to increase it to `99`. He attempted to subtract 2.

The gray window blared a harsh, momentary warning.

`[WARNING: INVALID OPERATION. VALUE CANNOT REVERT PAST ZERO.]` `[FORCING OVERRIDE...]` `[FATAL EXCEPTION AT LINE 0x88AA]`

The hexadecimal string violently glitched, flashing bright white before stabilizing. The value `00 00 00 01` had been forcefully inverted through a basic data overwrite, snapping to the maximum possible value for a 32-bit integer.

`[NEW VALUE: FF FF FF FF]`

Arthur immediately severed the connection, yanking his thumb off the Dev Tool. The floating green text vanished instantly, sucking back into the physical form of the screwdriver.

Arthur let out a massive sigh of relief, his heart pounding in his ears. The air smelled faintly of ozone and burning plastic. He looked down at the screwdriver. It looked exactly the same. No magical aura, no glowing runes.

But when he mentally triggered the System's basic observation skill, the item's parameters were vastly different.

`[Glitched Flathead Screwdriver]` `[Classification: Error]` `[Durability: NaN / ∞]` `[Description: This item has suffered a fatal data corruption. Due to an integer overflow in its structural variables, the System cannot calculate its degradation algorithm. It cannot be broken. It cannot be destroyed.]`

Arthur grinned, a wide, genuine smile breaking across his grim features. "An unbreakable lockpick, prybar, and chisel. Not bad for two minutes of coding."

He stood up, slipping the modified screwdriver and the Dev Tool Fragment into the inner pockets of his ruined suit jacket. He was a Level 0 NPC with absolutely zero combat stats. But he possessed infinite durability and the ability to read the matrix.

It was time to leave the building.

The sudden, deafening blare of a planetary alarm system shattered the silence of the Seattle sky. It wasn't a human siren; it was a deep, resonant hum that seemed to echo from the clouds themselves, vibrating in the chest of every surviving human on the planet.

A colossal, glowing blue text box materialized in the sky, large enough to be seen from the stratosphere.

`[GLOBAL ANNOUNCEMENT]` `[THE TUTORIAL PHASE ONE: CULLING, HAS CONCLUDED.]` `[PHASE TWO: MIGRATION, BEGINS NOW.]` `[SAFE ZONES HAVE BEEN GENERATED. PLAYERS MUST REACH A DESIGNATED SAFE ZONE WITHIN 72 HOURS OR FACE THE THE OVERRIDE PROTOCOL.]` `[SURVIVE. ADAPT. OVERCOME.]`

Arthur peered through a small, grimy window on the stairwell landing, looking out over the burning city. Massive pillars of golden light were shooting up from various points in the grid—one near the Space Needle, another somewhere down by Pioneer Square. Those were the Safe Zones. Areas where monster spawns were disabled, and the System provided basic trading hubs and healing nodes.

If the Timeline was holding true to his memories, the initial panic of the Integration was over. Now came the brutal, bloody march to the Safe Zones. The streets would be clogged with panicked Level 1 and Level 2 players, attracting roaming packs of tier-one predators: Orcs, Dire Wolves, and worse.

Arthur needed to get to the Pioneer Square Safe Zone. But to do that, he had to navigate forty-five floors of a corporate high-rise currently acting as a highly concentrated monster spawner.

He couldn't fight. He couldn't level up. But he didn't need to. He dragged his hand down his face, wiping off the last remnants of soot and dried blood.

"System," Arthur whispered, taking the first step down the concrete stairwell. "I'm going to teach you a lesson about bad programming."