148 - The Northern Current

Chapter 148 — The Northern Current

The flight to northern Japan was shorter than most of their previous international missions, but the atmosphere inside the aircraft was noticeably different.

Subin sat near the window, looking down at the coastline as the aircraft approached its destination. The northern region was covered in forests, mountains, and scattered settlements. From above, everything appeared ordinary, but the Association's mana scanners showed several abnormal concentrations beneath the surface.

Yerin sat beside him, reading the latest report.

"The dungeon has expanded another eight kilometers since yesterday."

Subin looked at the tablet.

"How quickly?"

"Approximately three kilometers every twelve hours."

Min-seok, seated across from them, leaned forward. "That's faster than the Pacific dungeon."

"Not exactly," Subin said.

Min-seok frowned. "Why?"

"The Pacific dungeon expanded through several environmental systems simultaneously. This one is following a specific route."

Yerin looked at the map.

"The underground water system."

Subin nodded.

The dungeon had not simply expanded outward.

It had found an existing underground network of rivers and groundwater channels and was using them to transport mana.

That made the situation more complicated.

If the mana continued moving through the underground water system, the dungeon could influence distant areas without ever physically expanding into them.

Jae-hyun joined the discussion from the opposite seat.

"How far can it travel?"

"We don't know."

"Could it reach a city?"

"If the water system connects to one, yes."

Min-seok frowned.

"Then we should stop it."

Subin shook his head.

"Not yet."

Min-seok sighed.

"You always say that."

"Because destroying something before understanding it can create a bigger problem."

Min-seok leaned back.

"Fine."

Yerin smiled.

"You're getting better at accepting his answers."

"I'm getting tired of arguing."

Ara, sitting behind them, laughed.

The aircraft landed near a temporary Japanese Association facility.

Several local Awakeners were waiting.

The leader stepped forward.

"I'm Takeda Renji, A-rank swordsman and field coordinator."

He was a broad-shouldered man in his early thirties, with short black hair and a calm expression. His sword hung at his waist, but unlike many swordsmen, he didn't carry heavy armor.

Subin noticed his stance immediately.

Renji noticed Subin doing the same.

"So you're Subin Vans."

"Yes."

"I've heard about you."

"I've heard about you too."

Renji smiled.

"Then perhaps we should train later."

"Sure."

Min-seok grinned.

"Another swordsman."

Yerin looked at him.

"You sound worried."

"I'm not."

"You look worried."

"I'm interested."

Subin ignored them.

Renji led the group toward the command center.

The Japanese Association had established a temporary base several kilometers from the dungeon entrance. Researchers were monitoring underground mana movement while local Awakeners were maintaining a safety perimeter.

The dungeon entrance itself was located inside a mountain valley.

It was unlike the traditional dungeon entrances Subin had seen before.

There was no glowing doorway.

No obvious structure.

Instead, a large section of rock had split open, revealing a deep underground passage filled with faint blue light.

Mana flowed through the cracks like water.

Subin crouched near the entrance.

He touched the ground.

The flow was strong.

But it wasn't chaotic.

It was following a pattern.

"How deep?"

Renji answered.

"The initial passage reaches approximately six hundred meters. After that, the terrain becomes difficult to map."

"Why?"

"The passage keeps changing."

Subin looked at him.

"Physically?"

"Yes."

That interested him.

They entered the dungeon shortly after noon.

The first section was surprisingly peaceful.

Blue crystals grew along the walls, but they weren't storing mana.

They were redirecting it.

The team moved carefully.

Several smaller monsters appeared.

They were wolf-like creatures, levels seventy to eighty.

The creatures didn't attack immediately.

Instead, they moved along the underground river.

Subin watched them.

"Don't attack."

Min-seok lowered his axe.

"Why?"

"They're following the mana."

The wolves moved toward a larger crystal formation.

Once they reached it, their bodies began absorbing tiny amounts of mana.

Their level increased slightly.

Seventy-six became seventy-seven.

Then seventy-eight.

The increase stopped.

Min-seok stared.

"They're feeding."

"Yes."

Jae-hyun studied the creatures.

"They're using the dungeon as a natural mana source."

Subin nodded.

The team continued deeper.

After nearly forty minutes, they reached the first major chamber.

An underground river flowed through it.

The water itself was clear, but blue light moved beneath its surface.

The researchers checked the readings.

"Mana density one hundred eighty percent above normal."

Ara looked around.

"It's stable."

Subin nodded.

"More stable than the surface."

Renji pointed toward the river.

"The dungeon's main flow seems to follow this."

Subin approached the water.

He could feel the mana moving beneath it.

The current wasn't simply carrying mana.

It was processing it.

Mana entered through the upper channels, became concentrated, and then moved downstream in a more stable form.

Subin crouched.

"This isn't just transportation."

"What is it?" Yerin asked.

"Filtering."

She looked at the river.

"Like the Greenfall system?"

"Similar."

"But smaller."

"For now."

The team continued along the river.

After another kilometer, they discovered something unexpected.

The underground river split into two.

One branch continued deeper.

The other moved upward.

Renji looked at the map.

"The upward branch wasn't here yesterday."

Subin looked at the surrounding walls.

"What changed?"

"Mana pressure increased."

Subin studied the formation.

The dungeon had altered its internal structure because the main channel had become too saturated.

Instead of allowing pressure to build, it created a new route.

Yerin understood.

"It's regulating itself."

"Yes."

Min-seok looked at the two paths.

"So which one do we take?"

"The deeper one."

They followed the original current.

The passage gradually became wider.

The monsters also became stronger.

A group of Level 96 A-rank Frostscale Wolves appeared near a large crystal pool.

This time, they were aggressive.

Six wolves surrounded the team.

Yerin raised her spear.

Subin held up a hand.

"Wait."

The wolves weren't attacking the group directly.

They were guarding the pool.

Subin observed the crystal beneath the water.

A smaller creature was drinking from it.

The wolves were protecting it.

Min-seok looked confused.

"Why?"

"Because it's part of their territory."

Subin studied the smaller creature.

It resembled a fox, but its fur was covered in thin blue crystal strands.

Its level was only forty-eight.

The wolves could easily kill it.

Instead, they were protecting it.

Ara smiled.

"The ecosystem is forming relationships."

Subin nodded.

He had seen something similar in the Pacific dungeon.

The dungeon wasn't simply creating stronger monsters.

It was changing how creatures interacted with one another.

The team slowly moved around the territory without disturbing them.

The wolves watched but did not attack.

That decision saved them a fight.

After another hour, the environment changed again.

The river became narrower.

The walls became darker.

The blue crystals disappeared.

Instead, thin silver lines appeared across the stone.

Subin touched one.

Mana moved through it.

"This isn't natural rock."

Renji looked at him.

"Then what is it?"

"A mana pathway."

The entire wall was part of the dungeon's circulation network.

Unlike the black crystals seen in Kazakhstan, these pathways had formed directly inside the rock.

They were becoming part of the environment itself.

Subin looked farther ahead.

The path continued.

"Keep moving."

They eventually reached a huge underground cavern.

Everyone stopped.

The chamber was enormous.

An underground forest covered the floor.

Trees grew from stone.

Their leaves glowed faintly.

A river passed through the center.

Small creatures moved between the roots.

Mana flowed through everything.

The dungeon had created an ecosystem.

Not a battlefield.

Not a monster nest.

An ecosystem.

Yerin looked around.

"It's beautiful."

Subin nodded.

"It is."

Min-seok lowered his weapon.

"Now I understand why you don't want to destroy these places."

Subin looked at him.

"They aren't just places."

Min-seok nodded.

"I know."

The researchers began recording data.

Subin walked toward the river.

The mana flow was incredibly stable.

More stable than anything they had encountered in the earlier sections.

But something else caught his attention.

There were no high-level monsters in the central area.

That was unusual.

A place with this much mana should have attracted powerful creatures.

Subin looked around.

"Where are the predators?"

Renji immediately understood.

"There should be some."

Yerin looked at the forest.

"Maybe they're deeper."

Subin nodded.

"Probably."

He didn't feel threatened.

The ecosystem appeared balanced.

But its balance depended on something.

The absence of predators meant something was controlling the distribution of mana.

Subin followed the river.

It led toward the center of the cavern.

There, beneath an enormous tree, was a stone formation.

It looked almost like a natural platform.

Mana entered it from seven different directions.

Subin recognized the structure.

Not the exact formation.

But the principle.

Multiple mana pathways were converging and balancing each other.

"This is the regulator."

Ara approached.

"You think it's controlling the entire chamber?"

"Yes."

Renji studied the structure.

"Can it be damaged?"

"Probably."

Min-seok frowned.

"Then we shouldn't touch it."

Subin nodded.

"Exactly."

The group spent several hours documenting the chamber.

They did not fight anything.

They did not collect valuable mana crystals.

They didn't even attempt to explore the deepest section.

The purpose of the mission had been reconnaissance.

They had achieved it.

When they returned toward the entrance, Renji walked beside Subin.

"You were right."

"About what?"

"This isn't a dungeon in the traditional sense."

Subin looked at him.

"It's becoming something larger."

Renji nodded.

"Do you think humanity should leave them alone?"

"Not completely."

"Then what?"

"Observe. Understand. Intervene only when necessary."

Renji smiled.

"That's difficult."

"Yes."

"Most Awakeners want to kill everything inside."

"They're trained to."

Renji looked toward the distant entrance.

"Perhaps our training needs to change."

Subin nodded.

When the team returned to the surface, the Japanese researchers were already processing the data.

The report would take several hours to complete.

For the first time since entering the dungeon, Subin relaxed.

Yerin approached him.

"You didn't fight anything."

"No."

"How do you feel?"

"Fine."

She smiled.

"You're getting used to peaceful missions."

"Maybe."

Min-seok walked over.

"Renji challenged me."

Subin looked at him.

"For what?"

"Sparring."

"Are you going to accept?"

"Obviously."

Min-seok grinned.

Yerin shook her head.

"You two can't go one day without fighting."

"That's not true."

She looked at Subin.

"Isn't it?"

Subin thought about it.

"Probably not."

They laughed.

That evening, the Japanese Association hosted a small dinner for the international team.

The atmosphere was relaxed.

Renji and Min-seok discussed axe and sword fighting.

Ara and the Japanese researchers discussed the dungeon's mana regulation.

Ethan and Liu Wei compared sword techniques.

Jae-hyun spoke with several local A-rankers about international response teams.

Yerin sat beside Subin.

The conversation around them continued.

Subin listened more than he spoke.

He realized something.

Months ago, a mission like this would have felt incomplete to him.

He would have wanted to fight the strongest monster inside.

He would have wanted a new technique.

A stronger sword.

A higher level.

Something measurable.

Now he could spend an entire day exploring a dungeon without fighting anything and still feel that the mission had been worthwhile.

His definition of progress had changed.

Strength was still important.

It always would be.

But understanding had become another form of strength.

Later that night, Subin stepped outside the building.

The mountain air was cold.

Yerin joined him.

"Can't sleep?"

"Not yet."

She stood beside him.

"Thinking about the dungeon?"

"Yes."

"Something bothering you?"

"No."

Subin looked toward the mountains.

"The dungeon is developing faster than the others."

Yerin waited.

"The internal ecosystem formed almost immediately."

"So?"

"I think we're going to see more of them."

"More evolving dungeons?"

"Yes."

She looked toward the dark mountains.

"Is that bad?"

"I don't know."

Subin smiled faintly.

"But it will make the world more interesting."

Yerin laughed.

"That's exactly what I expected you to say."

They stood together in silence.

Far beneath the mountain, mana continued flowing through the newly formed ecosystem.

The dungeon wasn't waiting for humans.

It wasn't planning anything.

It simply continued to evolve according to the environment around it.

And humanity was beginning to learn that survival in this new world would not always mean destroying what was unfamiliar.

Sometimes, survival meant learning how to live beside it.

The next morning, however, the researchers delivered one unexpected piece of information.

The underground mana river had continued moving during the night.

But instead of flowing deeper into the mountain, a portion of it had changed direction.

It was moving toward the coast.

The Japanese researchers believed the flow would eventually reach the ocean.

Subin looked at the map.

Another dungeon.

Another ecosystem.

Another connection between land and sea.

He smiled faintly.

The world was becoming increasingly interconnected.

And Subin was beginning to wonder how large that network would become before humanity finally understood that Earth itself was changing into something entirely new.