Chapter 20: The Fourth Line
The first thing to change was the silence.
Not the ordinary silence of the mountains. Not the unnatural stillness that had swallowed Echo Ridge when spiritual energy vanished from the mine.
This silence was different.
For a few brief moments, the world seemed to forget the distinction between a sound that had already happened and one that had yet to occur.
In a village dozens of kilometers from Echo Ridge, a bell rang before the wind moved its rope.
In Yunhai, an old scribe raised his head at the sound of three knocks on his office door.
No one stood outside.
And beneath the ruins of a structure absent even from the oldest maps, a new line appeared on a stone plate buried for countless years.
The fourth line did not glow.
It released no energy.
It caused no tremor.
It simply appeared—as though it had always been there, and the eyes of every creature in the world had been incapable of perceiving it until that moment.
Then, slowly, the line tilted.
Not upward.
Not downward.
It turned toward Yunhai.
Han Feng did not sleep that night.
His shelter lay on a remote mountainside, protected by irregular rocks and a simple formation that dispersed the surrounding spiritual energy. It would not withstand a determined Gu Master, but it was sufficient to discourage ordinary travelers.
He had chosen the location for its dense vegetation, limited trails, and the ease with which he could detect anyone approaching carelessly.
At least, that was what he had believed before the mine opened.
Now even the stars seemed untrustworthy.
Han Feng sat on a flat stone, studying the metallic fragment he had taken from Echo Ridge.
The object rested before him, wrapped in three layers of cloth and surrounded by a thin film of primordial essence. At first glance, it appeared to be nothing more than a piece of darkened metal, corroded by time and marked with nearly invisible lines.
But since the opening in the mine, the fragment had changed.
One of its lines had become slightly deeper.
Han Feng moved his finger near the surface without touching it.
The Art of the Celestial Veil kept his aura compressed and dispersed, preventing any fluctuation from escaping into the surroundings. Even so, he refused to let his primordial essence come into direct contact with the metal.
He had already seen what happened when the wrong energy touched the wrong object.
He had no intention of repeating the experiment without understanding its consequences.
The instruments used by the Threshold Society were not ordinary tools of investigation. Each object appeared to be part of a system whose original purpose remained unknown.
The ancient workshop had left behind three statements:
The first point recorded.
The second compared.
The third permitted passage.
Those words had been written by someone who understood the mechanism well enough to operate it, yet had admitted to not understanding what they were trying to control.
That contradiction bothered Han Feng more than the symbols themselves.
A person could build a weapon without understanding every property of the material.
But a person who built a mechanism capable of altering space—or something that merely resembled space—should have known what it was meant to do.
Unless the mechanism had been inherited.
Or discovered.
Or reconstructed from fragments by people who had mistaken partial knowledge for mastery.
Han Feng closed his eyes and reconstructed the scene at Echo Ridge.
The Council's formation had not created energy. On the contrary, part of the spiritual energy had disappeared before the opening even manifested.
The negative distance indicated by the instruments had not been a simple measurement error. The space before the wall had genuinely behaved differently.
And the landscape beyond it had not appeared ordinary.
There was no stable horizon. Distances changed when observed from different angles. The movement of distant shapes did not correspond to the movement of the observer.
The Threshold Society believed it was opening a passage.
But perhaps it was merely altering a boundary.
Or worse—
Perhaps it was announcing its own position to something that did not need a passage until it knew where to search.
Han Feng opened his eyes.
"If the opening had been the only problem, everything would have ended when it closed."
The fragment remained motionless.
He leaned forward and examined it again. The newly deepened line did not resemble the marks he had seen on the complete plate from the ancient workshop. It was narrower, almost like an incision made by an exceptionally fine blade.
Han Feng took a small wooden tablet from his storage ring.
On it, he drew the original symbol: three lines crossing at irregular angles, surrounded by an incomplete circle.
Beside it, he reproduced the pattern he had seen during the passage's closure.
A circle with four interruptions.
An additional line.
Finally, he drew the new symbol he suspected was related to the fragment.
When he finished, he leaned back.
The three drawings were not identical.
Yet their structural similarity could not be ignored.
They were not separate symbols.
They were different configurations of the same principle.
As though each represented a stage.
Or a response.
Han Feng covered the fragment again.
He would not test it tonight.
Curiosity was useful when it served understanding. It became a weakness when it led someone to touch what they did not yet comprehend.
In his previous life, he had heard too many stories of cultivators who died because they believed a mystery had to be solved immediately. In the Gu World, the same lesson applied to almost everything.
A rare resource could be an opportunity.
A trap.
Or both at once.
Han Feng rose and looked at the sky.
The stars were normal.
That, by itself, meant nothing.
At dawn, he returned to Yunhai.
Not by the main road, but along a trail used by woodcutters. He approached the northern gate after changing his clothes and further reducing the presence he left in the environment.
To a casual observer, he was merely a discreet young traveler in dark robes, wearing an indifferent expression.
He did not seek Qin Yue immediately.
First, he walked through the streets near the antiquities market. He purchased two old maps, an incomplete commercial register, and a small batch of seemingly worthless documents.
Then he visited a tool shop used by miners and asked about the old transport routes around Echo Ridge.
The merchant, a gray-bearded man, pointed to three paths on a map.
"That road was closed long ago. Landslides, they say. The other still exists, but no one uses it. The third leads to an abandoned quarry."
"And before the closure?" Han Feng asked.
"Before what?"
"The mine."
The merchant raised his eyes.
For a brief moment, his expression changed.
It was not fear.
Han Feng knew fear. He knew how it tightened muscles, altered breathing, and made the eyes search for an escape.
This was something else.
A decision.
The man had recognized a word he had not expected to hear—and had immediately decided that he would not answer.
"I don't know which mine you're talking about."
Han Feng nodded as though he accepted the response.
"Then I won't take up any more of your time."
He left a few coins on the counter and departed.
There was no need to pressure the man. His reaction had already told Han Feng that the mine's history had not disappeared.
Someone was still keeping certain information out of ordinary records.
And the merchant did not seem to belong to the Threshold Society's inner circle.
He had likely been instructed not to answer, perhaps by someone who still held authority over the region.
Han Feng walked two more streets before entering a teahouse.
He chose a table near the window, ordered a simple drink, and listened.
The conversations revolved around familiar topics: prices of Gu materials, disputes between small families, a caravan that had disappeared in the Western Region, and rumors that some cultivators were buying primordial stones in unusually large quantities.
Then, near the entrance, two men began arguing about an old road.
"I'm telling you, the northern route is blocked again," the first said. "My cousin works in transport. He saw people from the Council heading there yesterday."
"The Council? For what?"
"I don't know. But they weren't carrying mining tools. They had long boxes, the kind used to store formation plates."
The second man laughed without humor.
"Maybe they're searching for some ancient treasure."
"If that were all, they wouldn't have driven the residents out of the surrounding area."
Han Feng drank slowly.
The Council had arrived at the mine after the opening.
Now it was moving equipment elsewhere.
The sequence was too clear to be coincidence.
The Threshold Society feared that something might cross the passage, yet the Council seemed determined to continue its experiments.
The two organizations might be cooperating out of necessity.
That did not mean they shared the same objective.
Perhaps the Society wanted to contain the phenomenon.
Perhaps the Council wanted to understand how to use it.
And perhaps there were people within both organizations who did not know what they were truly trying to awaken.
Han Feng left the teahouse without finishing his drink.
His next stop was the archive.
Qin Yue received him after checking twice that the corridor was empty.
She looked more exhausted than during their previous meeting. Dark circles shadowed her eyes, and the hand holding the documents was less steady than before.
"You chose a terrible time to return," she said.
"That means something happened."
"It means people who have never cared about old records are suddenly asking too many questions."
Han Feng closed the door.
"The Council?"
"The Council, several representatives of local families, and two men who presented no official documents. The last pair claimed to be investigating historical forgeries, but they knew exactly which files to look for."
"What did they take?"
"Nothing. Not yet. They only copied references and requested access to records that should be sealed."
Qin Yue placed three sheets on the table.
The first contained a list of locations associated with ancient underground facilities.
The second was a report on the Nine Axes Workshop.
The third showed a series of partially erased names.
"I found these after you left," she explained. "I don't know if they'll help, but there's a note about an observation post east of Yunhai. It was built before the Echo Ridge mine and abandoned decades later."
Han Feng examined the sheet.
The post's name was nearly illegible.
Only two words remained clear:
Return Station.
Below it, a note written in another hand read:
Do not reconstruct the circuit while the response remains without origin.
He read the sentence twice.
"What does 'return' mean?"
"I don't know. The record is incomplete. There are references to three locations, but I haven't found a clear description of their purpose."
"And the station?"
"It was officially demolished. But the demolition report doesn't give its exact location. It only mentions an old stone road east of here, near a valley that disappeared from later maps."
Han Feng did not answer immediately.
A return station.
Not an observation post.
Not a containment site.
Return.
The word suggested that something was supposed to come back the way it had gone.
Or that someone had attempted to make something return.
"There's one more thing," Qin Yue added.
She took a folded piece of paper from inside a book and handed it to Han Feng.
It was a copy of a marginal note written in dark ink. The author had drawn the symbol of three crossed lines and written beside it:
The first point does not perceive what stands before it. It perceives what is missing.
The next sentence was blurred.
Han Feng held the paper closer to the light.
A few words remained distinguishable.
The second does not measure the distance between two places, but the difference between two conditions.
The third sentence was the shortest.
The third does not open.
Beneath it, in smaller letters:
It accepts.
Han Feng felt a faint pressure at the center of his forehead.
It was not a physical reaction. The Celestial Diagram remained hidden in his consciousness, but simply reading those words had provoked an almost imperceptible vibration.
Enough to confirm that the document was related to the same phenomenon.
He folded the paper.
"Have you shown this to anyone else?"
"No."
"Keep it that way."
Qin Yue pressed her lips together.
"Do you know what's happening?"
"No."
The answer was sincere.
Han Feng did not know what lay behind the structures. He did not know what existed on the other side of the passage. He did not know why the Celestial Diagram reacted to those anomalies, nor why two distant presences seemed to emerge whenever the phenomenon reached a certain stage.
But there was a difference between not knowing and being unable to form hypotheses.
"I only know that the people trying to control this don't understand the entire mechanism," he continued. "And now they're accelerating their experiments."
"Do you believe they'll open another passage?"
"I believe they'll do something worse if they think the first attempt was a success."
Qin Yue fell silent.
Han Feng stored the copy in his ring.
"I need the approximate location of the Return Station."
"I can try to find it in the old maps. But if someone else is already searching for the same place, it won't be safe."
"I'm not asking for safety."
He stood.
"I'm asking you not to tell anyone we discussed this."
Qin Yue watched him with an expression difficult to interpret.
"You always speak as though you've already decided what to do before entering this room."
Han Feng stopped at the door.
"Deciding what to do is easy. The difficult part is discovering which decisions will still be available after the others act."
He left without saying anything more.
The Return Station did not appear on current maps.
Han Feng had to compare four different records before finding an area that matched the descriptions. The place lay east of Yunhai, beyond a narrow valley surrounded by pine-covered slopes. The old stone road had been swallowed by vegetation, and sections of it were buried beneath landslides.
He arrived shortly before sunset.
The first thing he noticed was the absence of birds.
There was nothing extraordinary about that. Mountain regions contained countless areas where animals avoided staying, especially near ancient formations or unstable concentrations of spiritual energy.
But the absence here was complete.
No distant calls.
No wings beating between the trees.
Not even the sound of small insects hidden in the vegetation.
Han Feng stopped at the entrance to the valley.
The Art of the Celestial Veil was active. His aura remained so discreet that, unless someone possessed exceptionally refined investigative methods, it would be difficult to distinguish him from the natural energy around him.
He advanced without touching the stones of the road.
After roughly two hundred steps, he found the first trace of the old station: a broken pillar covered in moss, with a symbol carved into its side.
Three crossed lines.
An incomplete circle.
Han Feng did not approach immediately.
First, he examined the ground, the tree roots, and the valley walls. He found no recent footprints, tool marks, or formation residue.
Still, one nearby stone had a surface far too clean for something supposedly abandoned for decades.
Someone had been there.
Perhaps the Council.
Perhaps the Society.
Or someone who belonged to neither organization.
Han Feng circled the pillar and found a descending staircase, partially hidden beneath thick roots. The steps did not lead to a visible building. They disappeared into a narrow fissure in the slope.
He released a thread of primordial essence.
The energy traveled only a few centimeters before dissipating.
Han Feng immediately withdrew it.
This was not the same effect as at the mine. There, energy seemed to disappear at defined points, as though something removed it from the flow.
Here, the primordial essence had been interrupted before reaching the first step, as though the space ahead offered no valid condition for its propagation.
He remained still for a long moment.
Then he took an ordinary stone from his storage ring and threw it down the stairs.
The stone fell.
One second.
Two.
No sound.
Han Feng did not move.
Three seconds later, the stone reappeared at the top of the staircase.
It did not roll out of the fissure.
It was not thrown.
It simply appeared at the same point from which it had been launched, still rotating slowly.
Han Feng narrowed his eyes.
The stone stopped.
He examined it without touching it. There were no cracks or marks.
Yet a small area of its surface was covered with a layer of gray dust that had not been there before.
The Return Station was not merely an observation post.
The mechanism was still active.
And unlike the mine, it did not seem interested in allowing something to pass inward.
It seemed to return whatever attempted to cross.
Han Feng stepped back several paces.
He would not descend that night.
The decision did not come from fear, but from the lack of sufficient information. If the station was functioning, he needed to understand the conditions of its operation before testing its limits.
A mechanism capable of returning a stone might also return a blade, a formation, or even a person.
Or perhaps it would not return the same thing.
The gray dust on the stone's surface was a small but significant alteration.
Han Feng stored the object in a separate container.
Then he examined the symbol carved into the pillar again.
There was a difference.
The incomplete circle now bore a fine stroke that had not appeared in the old markings. It was not a complete fourth line, only a tiny extension from the edge toward the center.
Han Feng felt the Celestial Diagram vibrate.
This time, the reaction was stronger.
For an instant, his perception of the surroundings distorted. The valley seemed to lengthen, the trees moved farther apart, and the pillar before him appeared distant, though it had not changed position.
Han Feng closed his eyes and restrained his primordial essence.
When he opened them again, the valley had returned to normal.
But the sensation did not completely disappear.
He had not felt a presence watching him.
He had felt something trying to establish a direction.
Like a compass whose needle could not find north and therefore spun in search of any reference it could accept.
Han Feng looked at the symbol.
The fourth line at the mine had appeared after the opening. Now, in a much older structure, a similar stroke was beginning to emerge.
Perhaps the phenomenon was not limited to the place where the passage had opened.
Perhaps each attempt altered other points connected to the same system.
And if the Return Station reacted to that change, its function might be exactly what its name suggested: receiving something that returned, or preventing a response from finding its way back to its origin.
Han Feng was not certain.
But for the first time since he began investigating the structures, he had found a location whose apparent purpose contradicted the work of the Threshold Society.
They tried to permit an opening.
The station seemed designed to return whatever came through it.
The question was: return it where?
The answer arrived before Han Feng could leave the valley.
A dry sound echoed from inside the fissure.
A knock.
He stopped.
The knock had not come from the staircase. The sound seemed to emerge from the stone itself, spreading through the slope without traveling through the air.
Han Feng felt the vibration in his bones before he heard it.
Then came the second knock.
The third never arrived.
Instead, the pillar emitted a low noise, like a metal piece being dragged across a rough surface.
The mark carved into the stone changed.
The tiny additional stroke grew by several millimeters.
Han Feng did not approach.
He waited.
The valley remained silent for almost ten breaths.
Then, from somewhere very far away—so far that it could not be physically connected to the fissure—came a fourth knock.
The Celestial Diagram reacted violently.
Han Feng's consciousness was pulled for an instant into a darkness without direction. He saw no face, figure, or landscape.
He saw only the impression of an immeasurable distance, crossed by lines that intersected without forming a complete pattern.
At the center, something changed position.
It did not advance.
It did not retreat.
It simply ceased to be where it had been.
In response, the symbol on the pillar tilted eastward.
Han Feng immediately interrupted his inner perception and retreated beyond the old road. The Art of the Celestial Veil compressed his aura to its safe limit as he observed the valley from a greater distance.
No creature appeared.
No spiritual energy rose.
The pillar became motionless again.
But the fourth line remained.
Han Feng breathed slowly.
Now he had a hypothesis he could not ignore.
Perhaps the opening in the mine had not allowed something to cross.
Perhaps it had merely provided a reference to something that, until then, had possessed no stable direction.
The opening had not been a door.
It had been a signal.
And the Return Station's mechanism might be trying to answer that signal before the connection became permanent.
Han Feng looked toward the darkening sky.
If he was right, the Threshold Society had not merely made a mistake by activating the third point. It had initiated a process that would continue even after every instrument was destroyed and every entrance sealed.
He needed to discover how many structures still existed.
And, more importantly, whether there was a method to interrupt the connection before the lines were completed.
That same night, far from Yunhai, a gray-robed man examined the experiment's results in a windowless room.
Six bronze discs, two cracked plates, and a hastily written report from one of the Council's researchers lay on the table. The ink had not yet dried on several lines.
The man read everything in silence.
When he finished, he placed the report on the table.
"The passage closed," said another man seated across from him.
The Council representative had gray hair and an old scar crossing his eyebrow. His expression showed exhaustion, but no regret.
"The primary phenomenon ceased," the gray-robed man replied.
"Then the experiment was controlled."
"That is not what I said."
The representative narrowed his eyes.
"Are you suggesting the connection remains active?"
"I'm saying we don't know whether it truly ended."
The gray-robed man removed a sheet from the report. It contained a copy of the symbol observed inside the opening: an interrupted circle, three crossed lines, and an additional stroke that seemed to point outward.
"This drawing wasn't in the previous records," he explained. "It appeared after the passage began to close."
"A consequence of instability."
"Perhaps."
The representative extended his hand.
"Give me the complete report. The Council will decide whether there will be another attempt."
The gray-robed man did not move.
"If there is another attempt before we find the other points, we cannot guarantee the result will repeat."
"What do you mean, other points?"
For the first time, the gray-robed man hesitated.
He knew ancient structures existed. He knew the mine was not the only place associated with the symbols.
But the possibility that the points were reacting to one another without an active formation was something even the oldest records did not describe clearly.
"I mean we may have activated one part of a larger system."
The representative became still.
"And you knew this before the experiment?"
"I suspected it."
"And you didn't inform us?"
The gray-robed man held his gaze.
"I had no proof."
The silence that followed was more dangerous than any argument.
Finally, the representative gathered the bronze discs.
"The Council will continue the investigation. If the Society refuses to cooperate, we will find other specialists."
"You don't understand what you're searching for."
"And you do?"
The gray-robed man did not answer.
The representative stood and walked toward the door. Before leaving, he turned back one last time.
"Prepare the Return Station records. I want a team there before dawn."
The door closed.
The gray-robed man remained alone.
For several moments, he did nothing.
Then he removed a small object wrapped in dark cloth from inside his robes.
It was a metal plate, much older than those used in the experiment.
On its surface was a complete circle.
Four interrupted lines.
And at the center, a point that seemed to absorb light.
He placed the plate on the table.
A thin line appeared across its surface.
The gray-robed man went pale.
The plate had never reacted before.
"No..." he murmured.
The stroke moved slowly, tilting east.
Toward the Return Station.
He recoiled as though the small object might attack him.
For the first time in many years, he understood that the ancient records might not have described failed experiments.
Perhaps they had recorded attempts to prevent something that had begun long before any human discovered those structures.
And now, after countless years of silence, the system was responding again.
Han Feng left the valley before midnight.
He did not try to destroy the pillar. He did not touch the staircase, nor did he take any fragment from the station.
He already had enough information to know that a careless intervention could alter the mechanism's behavior.
His priority was to reach Yunhai before the Council's team.
He needed to find Qin Yue, obtain the complete records, and discover whether the Return Station had a corresponding structure somewhere else.
As he walked between the trees, he felt the Celestial Diagram vibrate one last time.
This time, there was no distortion of perception.
Only a distant impression, almost impossible to distinguish from a thought that did not belong to him.
Something had found a direction.
Not a complete path.
Not an open passage.
Only an orientation.
Han Feng continued walking without quickening his pace.
If the phenomenon was searching for a direction, he would not offer it another reference. He would not use the Diagram to probe beyond the boundary, would not try to provoke a response, and would not repeat the procedures he had witnessed in the mine.
His goal was not to discover what existed on the other side at any cost.
It was to understand enough to prevent it from reaching his side.
The difference seemed small.
In truth, it was the only thing separating him from the men who had opened the passage.
Behind him, hidden in the darkness of the valley, the symbol on the pillar remained still.
The fourth line did not grow.
But for the first time, it stopped pointing east.
It turned toward the place where Han Feng had been standing.
And far beyond the limits of anything the Gu World's maps could represent, something that still lacked a recognizable form stopped searching at random.
It began searching for an answer.