The drop into the Undermarket was roughly fifteen feet, straight down a slick, moss-covered brick shaft. Kaelen landed with a heavy splash, ankle-deep in a sluggish stream of foul-smelling, iridescent water. The stench was immediate and overpowering—a putrid blend of decaying organic matter, stagnant moisture, and the sharp, metallic tang of raw, unfiltered mana.

He remained crouched for a long moment, letting his eyes adjust to the gloom. The only illumination came from patches of glowing, bioluminescent fungus clinging to the arched ceiling of the massive sewer tunnel. The pale green light cast long, distorted shadows across the wide, brick-lined walkways that flanked the central drainage channel.

This was exactly how he remembered it. The Undermarket was a vast, labyrinthine network of forgotten infrastructure, sprawling beneath the pristine streets of Aetheria. To the Overseers, it was an empty, unrendered space, a digital blind spot in the Starting City’s design. To Kaelen, it was a goldmine.

He stood up, shaking the gross water from his boots, and adjusted his grip on the duct-taped chef's knife. The weapon was already heavily chipped from the Hobgoblin encounter, its edge dulling rapidly. It wouldn't last much longer.

"Menu," he whispered.

He double-checked his status screen. His Agility was a towering 25. His Vitality sat at a respectable 15. The rest of his stats were barely above human baseline. He was essentially a glass cannon—incredibly fast, capable of dodging almost anything a low-level mob could throw at him, but if he took a solid hit, he was dead.

A high-pitched, chittering sound echoed from the darkness ahead, accompanied by the wet slap of bare, callous feet on slick stone.

Kaelen slunk into the shadows hugging the curved wall, his breath slowed to a silent rhythm.

From around the bend in the tunnel, three figures emerged into the dim green light. They were bipedal, standing roughly four feet tall, covered in patchy gray fur. They had elongated, rat-like snouts, beady red eyes, and long, naked tails that dragged behind them. In their clawed hands, they held crude weapons made from rusted pipes and sharpened bone.

Ratmen. `[Level 2-4]`.

They were the bottom feeders of the Spire's ecosystem, pathetic scavengers that existed only to clean up the refuse of the higher floors and provide easy experience points for terrified, low-level players who mistakenly wandered down here.

Kaelen didn't feel a shred of pity. He felt only predatory anticipation.

He didn't need to use his `[View Hex Code]` skill. He didn't need to drain his sanity for these trash mobs. With 25 Agility, they were moving in slow motion.

He lunged from the shadows.

The closest Ratman only had time to widen its red eyes before Kaelen’s chef's knife was buried hilt-deep into its throat. He twisted the blade and yanked it out, using his forward momentum to tackle the second Ratman to the wet stone floor.

The creature shrieked, thrashing wildly, trying to bring its rusted pipe down on Kaelen's head. Kaelen easily batted the clumsy strike aside with his left arm, his duct-tape bracer deflecting the blow entirely. He drove his knee into the Ratman's chest, pinning it down, and brought the knife down in a swift, brutal arc.

`[Target Eliminated: Ratman Scavenger (Lv. 2)]` `[Target Eliminated: Ratman Scavenger (Lv. 3)]`

The third Ratman, witnessing the instantaneous slaughter of its companions, rightfully panicked. It dropped its bone knife and turned to flee back into the darkness.

"Oh no, you don't," Kaelen muttered. He was fast, but sprinting blindly into an unmapped section of the Undermarket was a good way to fall directly into a breeding nest.

He needed to end it quickly. It was time to test his new toy.

"Minor Reality Edit," he whispered.

The immediate, stabbing pain behind his eyes was familiar, a sharp reminder of the cost of breaking the System's rules. The world overlaid with its wireframe matrix.

He focused his gaze not on the fleeing Ratman, but on the brick floor roughly ten feet ahead of the creature’s path. The red collision lines of the stone were solid and dense. Kaelen extended his hand, visualizing the Z-axis coordinates of those specific bricks.

*Raise. One foot.*

He didn't physically touch the ground. He simply willed the code to change.

With a grinding, unnatural sound—like digital static tearing through physical space—a heavy block of the brick flooring abruptly snapped upward, forming a perfectly sheer, one-foot-tall step that entirely defied architectural logic.

The fleeing Ratman, completely unequipped to handle suddenly mutating terrain, slammed its foot directly into the lip of the glitched stone. Unseen physics threw it forward in a hard, violent tumble. It crashed face-first onto the wet bricks, a sickening crack echoing through the tunnel as its snout broke.

Kaelen casually jogged up to the stunned creature and ended its misery with a quick, efficient stab to the base of its skull.

`[Target Eliminated: Ratman Runner (Lv. 4)]` `[Experience Earned: +25]`

He canceled the skill immediately, leaning against the damp wall as a wave of nausea washed over him. He coughed, a small speck of blood landing on his sleeve.

The feedback from `[Minor Reality Edit]` was significantly worse than `[View Hex Code]`. Altering physical space forced his biological brain to process raw, conflicting data streams from the System's core architecture. It was like trying to download a terabyte of data into a computer built in the 1990s.

"Can't spam that," he rasped, wiping his mouth. "Not unless it's a matter of life and death."

Still, the tactical applications were terrifying. He could literally manipulate the battlefield to his advantage. He could create cover where there was none, trip enemies, trap them in suddenly spawned pit-falls, or force them into lethal bottlenecks. He just had to be incredibly careful not to melt his own brain in the process.

Kaelen knelt beside the dead Ratmen, quickly searching their filthy bodies. As expected, they carried nothing of value. The System hadn't rendered any loot tables for these specific mobs yet. They were placeholders.

He continued down the tunnel, relying on the bioluminescent fungus to guide his way. He navigated the sprawling, intersecting pathways with the confidence of a man who had spent years memorizing architectural blueprints.

He wasn't wandering aimlessly. He was looking for a specific marker—a subtle glitch in the environment design that he had discovered entirely by accident in his previous life.

Ten minutes later, he found it.

The tunnel dead-ended at a massive, circular iron vault door, rusted completely shut and covered in thick layers of green slime. To any normal player, it was just a piece of set dressing, an unreachable background element meant to make the Undermarket feel like a real, functioning sewer system.

But Kaelen knew better.

He stepped up to the massive vault door, completely ignoring the heavy, rusted wheel mechanism in the center. He looked at the heavy iron hinges bolted into the stone frame.

"Hex Code," he muttered, forcing himself through the fresh wave of pain.

The wireframe revealed what the System was trying to hide. Behind the impenetrable red collision lines of the vault door was a narrow, perfectly empty corridor leading downward. And at the end of that corridor, a pulsating, golden box of data—a high-tier treasure chest.

This was a Developer Room.

In the early days of the Spire's creation, before the Overseer AIs took over full autonomous control, the original architects—whoever or whatever they were—had left hidden caches scattered throughout the lower floors. These rooms contained items that wildly unbalanced the early game, items meant for testing and debugging, not for regular players.

The System, unable to easily delete these physically rendered spaces without causing massive code conflicts, had simply walled them off, placing impenetrable barriers in front of them.

Kaelen smiled, a thin, feral expression that didn't reach his eyes.

"Impenetrable is just a suggestion," he said softly, pressing both hands against the heavy iron hinges.

It was time to break in.