Author Note : Lately, I've been going through some serious financial difficulties related to my college expenses. It has been quite stressful for me, and because of this, my chapter updates may become irregular for some time. I truly apologize to everyone who has been patiently waiting and supporting my work.
Writing and sharing these chapters with you all means a lot to me, and I deeply appreciate every reader who spends their time on my stories.
If you would like to read more chapters and support my work during this difficult period, you can visit my Patreon:
patreon.com/otaku_Reader
Any support or donation there would genuinely help me continue writing and managing my college expenses.
Thank you all for your understanding, patience, and kindness. It truly means more to me than you know.
CHAPTER 11 : Burned Metal
They spent four hours in the desert sector.
The first hour was calibration.
He and Sohee moved through the outer ring of the dungeon's terrain in a loose paired formation, him three steps ahead and left, her three steps behind and right, the positioning he'd worked out on the air train that maximized their combined coverage while keeping them close enough for mutual support.
She'd adjusted to it within the first ten minutes without being asked, which told him her spatial instincts were good.
The sand sprouts, once his Thread Perception adapted to reading their specific vibration signature in the substrate, became manageable.
The key variables were: depth, speed, and the two-beat interval between the pre-surface vibration and the actual emergence. He could reliably read the first two within three minutes of initial contact with a new specimen.
The third.... the interval was consistent across all specimens he encountered, and he committed it to memory in the first fight.
Consistent two-beat interval. Consistent three to four centimeter vibration amplitude at emergence distance. Consistently vulnerable in the open mouth is the only unarmored surface on the creature's body.
He killed his first six the same way: Thread Perception identifying the approach, a sidestep to open the angle, a cut aimed at the mouth in the fraction of a second between emergence and the first bite.
It was not elegant. He was cutting at a moving target in a specific direction under time pressure, and his execution was imprecise enough that two of the six cuts missed the mouth and hit the armored exterior instead, which meant two of the six required Sohee's spear to finish.
But his read was accurate on every approach. The sidesteps were correct. He never took a bite.
By the twelfth kill, he'd started to notice the rhythm. The desert dungeon had a rhythm the way an opponent had a rhythm.
Active periods followed by relative quiet, the way a combat exchange had pressure and release phases.
Understanding the rhythm meant understanding when to push into unexplored terrain and when to hold position and let the environment come to him.
"You're very calm," Sohee said during a quiet interval, the two of them standing in the shade of a dune's shadow while she drank water.
"I'm focusing," he said.
"Most people sweat more in their first real dungeon than this."
"I sweat appropriately."
She looked at him for a moment, and he could see the analytical machinery working behind her eyes — she was reading him the way he read opponents, and he let her, because he trusted her conclusions to be fair. After a moment she went back to her water.
"You counted the vibrations before the third one surfaced," she said. "Two beats. You've been using it as a timing signal."
"Yes.".
"Where did you develop that?"
"The VR sessions," he said, which was partly true. The VR sessions had given him Form Three. Thread Perception's environmental extension was something he'd developed in the past two weeks, applying the form's principles beyond combat reads.
"Your technique is strange," she said. It wasn't a criticism. She said it the way she said everything — as an observed fact that might be relevant.
"It's a style built for my capabilities," he said.
"What is it called?"
He thought about this. The Eclipse Thread Art had no public identity — it hadn't been written into this world's martial tradition. Naming it would create a reference point, and reference points attracted questions.
"I haven't named it yet," he said.
She accepted this without pressing.
* * * * * * *
The smell hit them in the third hour.
Burned metal — sharp, industrial, cutting through the dry ambient heat of the desert sector with the aggressive quality of something not naturally occurring.
Sohee registered it at the same time he did; she moved her spear to elevated guard without being told.
"That's not a sand sprout," she said.
"No."
The burned metal smell, combined with the acid undertone that the documentation described, meant a high-concentration acidic environment — either multiple sand sprouts aggregating, which was documented but rare for F-rank dungeons, or something larger.
He was already running Thread Perception on the sand around them.
The vibration was different. Deeper frequency, lower amplitude — not the quick shallow buzz of a sand sprout approaching at speed, but a slow, massive oscillation that moved through the substrate like a tide rather than a wave.
"Back up," he said.
"How far?"
"Twenty meters. Slowly. Don't run."
Running would change the vibration pattern of the surface and telegraph their position to something that was clearly already tracking them.
They moved backward, measured step by measured step, and the deep oscillation followed.
He pulled out his phone. Monster encyclopedia. He searched for the vibration description — deep, slow, massive.
The result came back immediately: Giant Sand Maw. F-rank dungeon boss variant.
Scaled-up sand sprout variant, three to four meters in length, titanium-hard exterior shell, dramatically reduced speed versus standard sand sprouts, extremely high durability.
Noted weakness: same as the standard variant — the unarmored mouth, but scaled — the opening alone was approximately forty centimeters across, which meant the problem wasn't finding the weak point, it was getting close enough to target it safely.
The monster encyclopedia had a note at the bottom of the entry: Solo recommended rank F+ or higher. Party recommended F or higher.
They were one F+ and one F.
"This is the boss," he told Sohee.
She looked at the phone screen. Looked at him. "The core market value for a boss kill is 8x standard?"
"Yes."
She looked at the sand. The deep oscillation was holding position approximately thirty meters out — the boss appeared to be circling, as though trying to determine approach angle.
"We can do this," she said. Not confidently. Analytically. Estimating.
"The exterior won't crack on the first hit," he said. "I've been reading the vibration. It's significantly denser than the standard variant. Sustained impact on a single point is the only approach."
"How sustained?"
"Ren — " he stopped himself.
"The documented method is approximately ten to fifteen minutes of concentrated impact on a single structural point to initiate cracking, then another ten to twenty before the crack expands enough to expose soft tissue."
"Where did you read documented methods?"
"I research extensively," he said.
A pause. The deep oscillation moved closer — three meters, then two. The sand around them was beginning to compact slightly, a precursor to a near-surface pass.
"We need to know when it's about to surface," Sohee said.
"I can handle the sustained impact component — spear reach keeps me farther from the bite radius. But I need to know when it's coming up."
"That's Thread Perception," he said. "I'll call the surface timing. You concentrate the strikes."
"Aim for the same point every time," he added. "Exactly the same point."
She set her spear. "Where?"
"I'll mark it on the first pass." He drew his sword.
"I'll need one cut when it first comes up — before it clears the sand completely. There's a segment junction on the exterior shell approximately twenty centimeters behind the head. That's where the armor is thinnest."
"How do you know that?"
He didn't answer. The oscillation had shifted.
"It's coming," he said. "Three seconds. Directly to your left. Don't move until it's fully out."
Sohee locked her stance.
One. Two. Three.
The desert floor exploded.
To be Continued.
Author Note : Lately, I've been going through some serious financial difficulties related to my college expenses. It has been quite stressful for me, and because of this, my chapter updates may become irregular for some time. I truly apologize to everyone who has been patiently waiting and supporting my work.
Writing and sharing these chapters with you all means a lot to me, and I deeply appreciate every reader who spends their time on my stories.
If you would like to read more chapters and support my work during this difficult period, you can visit my Patreon:
patreon.com/otaku_Reader
Any support or donation there would genuinely help me continue writing and managing my college expenses.
Thank you all for your understanding, patience, and kindness. It truly means more to me than you know.