166 - The River Frontier

Chapter 166 — The River Frontier

The moment the crystalline network reached the river, the nature of the expedition changed. Until then, Subin and the others had been following a moving territory through roads, abandoned irrigation channels, and underground passages, but the river gave the network something it had not possessed before: a continuous route stretching far beyond the area they had mapped. The glowing water carried small crystalline fragments downstream, and wherever those fragments settled, thin branches of black crystal began emerging from the riverbed. Within minutes, the network had established a series of temporary nodes along the banks.

Ara watched the readings from the command vehicle while several screens displayed the river's changing mana concentration. “The main structure isn't moving downstream yet. It's dividing itself. Some sections are remaining here while smaller branches are traveling with the current.”

Subin studied the river. “It's creating checkpoints.”

“That's one way to describe it,” Ara said. “The strange part is that the branches aren't identical. The ones farther downstream are weaker, while the formations around the main node are much denser.”

Yerin joined them and looked over the map. “So the farther it spreads, the weaker the connection becomes?”

“Initially, yes. But the weaker branches are absorbing mana from the river. If they remain there long enough, they may become stable.”

Subin understood the implication. The network did not need to move its entire structure every time it wanted to expand its influence. It could leave behind smaller nodes and use them as anchors. That explained how it had connected the coast, mountain region, and eastern territory without requiring one uninterrupted physical formation.

“It is building a road behind itself,” he said.

Jae-hyun, standing nearby, looked toward the river. “And if the road keeps growing?”

“We may eventually have a network stretching across the entire region.”

Rafael crossed his arms. “Which means every settlement along this river could become part of the territory.”

“That depends on how the network behaves around people,” Subin replied.

Rafael gave him a skeptical look. “We've already seen what happens when people and monsters compete for the same land.”

Subin did not disagree. The South American valley had already shown them that the most dangerous conflict was not always caused by monsters. Humans wanted resources, monsters needed territory, and the newly formed ecosystems were changing the value of land that had once been ordinary.

Before anyone could continue, a warning came from the local command team.

“Movement detected downstream.”

Ara enlarged the map.

Several groups of monsters were traveling along the river, but unlike the earlier migration, these creatures were not moving in one direction. Some were leaving the water while others were entering it. The network was effectively creating a temporary ecological corridor.

Diego looked at the riverbank through binoculars. “There are people ahead.”

The team moved downstream.

They found a small settlement built beside the river, with several dozen houses spread across both banks. The inhabitants had already gathered near the road, watching the glowing water with obvious fear. Local Awakeners stood between the settlement and the river, uncertain whether they should fight the approaching creatures.

A middle-aged man stepped forward when Subin's team arrived. “Are you from the Association?”

“Yes,” Director Kang answered. “Has anything attacked the settlement?”

“Not yet. But the river changed this morning. Then those things started appearing.”

He pointed toward the water.

A group of large creatures was approaching from upstream. Among them were several Riverback Crocodiles, smaller amphibious predators, and a herd of plant-eating beasts that had been altered by the increased mana concentration.

The villagers expected an attack.

Instead, the creatures passed the settlement without even looking toward the houses.

The Riverback Crocodiles entered a shallow section of the river and settled near the bank, while the herbivorous beasts moved into an abandoned field several hundred meters away.

Subin watched the scene carefully.

“They aren't interested in the settlement.”

The local Awakener leader lowered his weapon slightly. “Then why are they here?”

“Because the environment changed.”

Yerin glanced toward the abandoned fields. “And there is enough food and water here.”

Subin nodded. “If we don't disturb them, they may remain there instead of moving through the village.”

The settlement leader looked uncertain. “You're saying we should just let A-rank monsters stay beside us?”

“Not without precautions,” Subin replied. “We establish a buffer zone between the settlement and the new habitat. No one enters the habitat without authorization, and the Association monitors the creatures. If they begin showing aggressive behavior, we respond immediately.”

It was not a perfect solution, but neither was destroying every monster that entered the area. The people needed safety, while the creatures needed somewhere to live. The new frontier demanded compromises that had never been necessary before the invasion.

The local government accepted the proposal after Director Kang explained the Association's monitoring plan.

By evening, the first temporary boundary had been established.

The network, however, continued moving.

Subin's team followed the river for another thirty kilometers, passing through several abandoned agricultural areas. Everywhere the crystalline fragments had settled, the surrounding environment began changing. Plants grew more rapidly, insects became larger, and small mana-sensitive creatures appeared near the water.

The changes were not violent.

They were simply fast.

At sunset, the team established a temporary camp on a raised section of land overlooking the river. The crystalline network could be seen glowing several kilometers away, its dark structures reflecting the last light of the day.

Yerin sat beside Subin while the others rested nearby.

“You've been staring at that river for ten minutes,” she said.

“I'm trying to understand the pattern.”

“You're going to make yourself tired before the monsters do.”

Subin smiled. “That's possible.”

Yerin looked at the distant glowing branches. “Do you think this will keep spreading?”

“Yes.”

“You sound very certain.”

“The network has already connected three territories. Now it has found a river that can carry its branches much farther. Unless something interrupts it, expansion will continue.”

Yerin was quiet for a moment. “And what happens to the people living here?”

“That depends on how we handle it.”

She turned toward him. “You really believe humans can coexist with these territories?”

“I think we can try.”

“That isn't the same as saying we can.”

“No,” Subin replied. “But destroying everything we don't understand won't work either.”

Yerin smiled faintly. “You have changed since the first dungeon.”

Subin looked at her.

“You used to enter a dungeon, defeat everything in your way, collect what you needed, and leave.”

“That worked.”

“It did.” She laughed softly. “But now you're spending half your time protecting monsters.”

“I'm protecting people too.”

“I know.”

Her voice became quieter.

“That's why I said it.”

Before Subin could respond, Ara's voice came through the communication device.

“Subin, we've got a problem.”

He immediately stood.

“What happened?”

“Something has appeared farther downstream. The network is reacting to it.”

Subin and Yerin joined the others as Ara projected the latest map.

A large concentration of mana had appeared nearly fifty kilometers downstream.

But it was not coming from the river.

It was coming from beneath it.

The readings showed a broad underground structure intersecting the river at an angle. Unlike the existing crystalline network, this structure was dense and stable.

Ara continued. “I've compared the readings with the mountain node. The energy pattern is similar, but the structure itself is different.”

“How different?” Jae-hyun asked.

“It doesn't look like a branch.”

The screen displayed a three-dimensional reconstruction.

The underground structure resembled a massive circular formation beneath the river, with several thick channels extending outward.

Liu Wei narrowed his eyes. “Another node?”

Ara shook her head.

“I don't think so.”

Subin studied the projection.

The structure was positioned exactly where several underground water systems intersected. The river above it was only one part of a much larger network.

“What does the system say?” Yerin asked.

Ara hesitated before reading the notification.

“Territory Node Detected. Classification: Regional Junction. Stability: 84%. Connected Waterways: 7. Estimated Influence Radius: 43 kilometers.”

The group fell silent.

Subin looked downstream.

The moving coastal territory had been following water.

But it had not been following the river randomly.

It had been moving toward this place.

The network's smaller branches suddenly brightened along the riverbank.

Then the ground beneath the camp trembled.

The movement was brief, but strong enough to shake equipment from the tables.

Diego immediately checked the surrounding area. “No monster movement.”

Ara looked at the readings again.

“The junction has activated.”

Subin drew Simple Edge.

Not because he expected an attack, but because the entire environment had changed.

Across the river, several crystalline structures began withdrawing from the ground. Instead of spreading outward, they pulled themselves toward the water and disappeared beneath the surface.

The river rose.

A wide section of water began rotating slowly, forming a massive circular current.

Then the underground junction sent a pulse through the river.

Every crystalline node established along the banks responded at the same time.

The network had stopped moving downstream.

It had found what it was looking for.

A regional junction.

The river suddenly split around a newly emerging crystalline structure, revealing a dark stone formation rising from the riverbed. It was not a tower like the coastal structure, nor a core like the mountain node. It was a broad circular platform covered in crystalline veins, with seven channels extending from its center into the surrounding land.

Ara stared at the readings.

“Seven waterways.”

Subin looked at the formation.

“Seven routes.”

Rafael stepped beside him. “Where do they lead?”

Ara expanded the map.

The seven routes spread across the region.

One returned toward the coast.

Another led toward the mountain.

Three moved into populated agricultural districts.

The sixth followed the river toward a large city.

The seventh extended beyond the current mapping range.

The expedition suddenly had a problem far larger than the moving dungeon itself.

The network had reached a junction where one territory could influence an entire region.

Director Kang's expression hardened. “We need to establish control before those routes activate.”

Subin shook his head.

“We don't control it.”

Kang looked at him.

“We decide which routes are safe enough for the network to use,” Subin continued. “If we try to force it to stop here, we may cause the same kind of uncontrolled expansion we've been trying to prevent.”

Jae-hyun looked at the seven channels. “And if we let it choose freely?”

“Then we may have monsters and crystalline territory appearing inside cities.”

Nobody argued with that.

Subin stepped toward the river junction.

“We need to map all seven routes.”

Liu Wei smiled faintly. “That sounds like a lot of work.”

“It is.”

“And I assume you're going to make us do it.”

Subin looked at the team.

“Yes.”

Several members sighed, but nobody refused.

They had started the expedition trying to understand a moving dungeon.

Now they were standing before something much larger: a living territorial network capable of using rivers, underground channels, mountains, and ecosystems to connect distant regions.

The next stage would not be about conquering a dungeon.

It would be about deciding where an expanding world could safely exist.

And beneath the river, the seventh route had already begun to glow.