Gu Yanshu stood still for a moment after the last words left his mouth.
Information was his weakness.
He had already admitted it to himself once.
Now the thought pressed harder because the city in front of them was breaking open with sound, and the only thing louder than the explosions was the feeling that there was meaning hidden inside them.
He looked once more at the route they had just left behind.
The map had named too much.
Library of Learning.
Training area.
Main area.
Side route.
Lower route.
All of it had been written too neatly, too completely, like the map had been made by someone who had already walked every corner of the place and wanted the next person to know where to stand, where to stop, and where to die.
That was the part that made his eyes narrow.
Not the labels.
The intention.
He Mulin noticed the change in his expression.
"Lord?"
Gu Yanshu closed the map.
"We do not move forward yet."
The others stayed quiet.
He continued, "We only came back for the books. We take them. We leave the place as it is. Nothing more."
Qu Yaoyang looked at him carefully.
"That map knows too much."
"Yes."
Gu Yanshu's voice was low.
"I did not draw it. I did not give it permission. It was there already. That means something else knows the layout better than we do. If we keep pushing blindly, we walk into someone else's design."
Lan Wege glanced at the structure ahead.
"This house already has layers."
Gu Yanshu nodded.
"Yes. And some of them do not want to be opened by force."
Yu Chang swallowed once.
"So we take the books and retreat."
"That is all."
The others moved with him at once.
No one argued.
No one rushed.
They entered the broken grounds again with caution, their steps measured, their eyes moving over the walls, shelves, seams, and hidden routes that had already been exposed. The place no longer felt mysterious in the same way. It felt watched.
Gu Yanshu kept the map in one hand and the book in the other.
He did not open either one again.
They gathered the remaining books carefully.
The Library of Learning section held more than they had first taken.
Some of the volumes were old records.
Some were route notes.
Some were sealed volumes that had not been touched in years.
The disciples packed them without disturbing the surrounding structure.
No one broke a shelf.
No one tore a wall.
No one forced a chamber open.
They only took what was already meant to be taken.
He Mulin carried the heavier bundles.
Qiu Weiran checked the labels.
Lan Wege watched for movement in the corners.
Yu Chang moved with a quiet seriousness.
Qu Yaoyang stayed near the front, making sure nothing behind them shifted without notice.
Gu Yanshu looked at the place one more time.
Then said, "Leave it."
The others left the ruins exactly as they had found them in their final state.
The broken walls stayed broken.
The hidden passages stayed hidden.
The chambers stayed sealed.
They took the books and walked out without touching anything else.
Qu Yaoyang finally spoke as they reached the outside path.
"Why did we retreat?"
His tone was controlled, but the question was real.
"Was there something dangerous?"
Gu Yanshu kept walking for a moment before answering.
"Yes."
The others listened.
"The map was already waiting there," he said.
"It named everything. Library of Learning. Training area. Main area. More sections than we had already found. It was too complete. That kind of map does not exist for convenience. It exists to direct movement."
Lan Wege looked at him.
"So it was bait."
"Yes."
Gu Yanshu's face stayed calm.
"If we move forward in the wrong way, we become part of it."
Yu Chang looked uneasy.
"And if we disturb the house too much?"
Gu Yanshu's answer came without hesitation.
"Then we may die for it."
That made the group quiet.
Qiu Weiran looked down at the book he was holding.
"Then we leave it alone."
"Yes."
They moved farther from the structure.
The broken grounds remained behind them.
The books were safe.
The route was not.
Gu Yanshu kept one eye on the path ahead and one on the map in his memory.
Something had already been marked there.
Not by him.
By the place.
That was enough to make him cautious.
He was still thinking about the warning when the city appeared ahead.
Not the outer edge.
The inner section.
Tall structures.
Crowded roads.
A heavier noise than the archive had carried.
Then the explosion started.
It was sudden enough that the group stopped at once.
A bright burst hit one street ahead.
Then another.
Then another.
Dust flew up from the road.
Fragments of stone scattered into the air.
The noise was sharp and repeated, rolling through the city with a rhythm that did not feel accidental.
Gu Yanshu lifted his head.
The others did too.
The explosions were happening near them now.
Not directly on top of them.
Close enough to be impossible to ignore, far enough to still feel controlled.
The group's feet left the ground almost at once.
Not from fear.
From movement.
They rose into the air in one clean shift and looked toward the source of the disturbance.
Qu Yaoyang's gaze sharpened first.
"That word again."
He pointed toward the center of the smoke.
"Listen."
There was only one repeated sound inside the destruction.
One word.
The same word.
Again and again.
Not clear at first.
Then clearer.
"The sin."
Lan Wege frowned deeply.
"That is what they are shouting?"
Qiu Weiran's expression tightened.
"Or what one of them is forcing through the whole place."
He Mulin looked at the smoke and the broken street beneath it.
"This is not random."
Yu Chang's eyes moved across the roofs.
"There's someone inside that."
Gu Yanshu looked toward the sound.
Then the shadow in the smoke changed.
A figure moved through the air above the street.
Large.
Fast.
Sharp in outline.
A pressure followed it, dark and heavy, moving through the dust like it had already decided the whole street belonged to it.
The first of the five powerholders landed in the air above the blast point.
The figure did not walk.
It held itself in the sky.
The others watched.
A second figure on the ground had already been struck down.
The moment the word had been spoken, that person's body had lost power and dropped to the street without resistance.
No one in Gu Yanshu's group spoke for a breath.
Then the first one in the sky turned its head.
It noticed them.
The shadow around it shifted.
A sword formed in one hand.
Then dark force pressed around the blade until it looked heavier than steel.
The figure's voice cut through the smoke.
"Move."
Qu Yaoyang answered first by stepping in front of Gu Yanshu.
"Not happening."
The first one laughed once.
Not loud.
Cold.
"Then you are blocking the wrong path."
It moved.
A beam split the smoke and shot toward them.
Gu Yanshu moved his hand in front of him and a barrier spread out cleanly.
The beam struck and scattered light across the shield.
The force pushed the air back around them.
He Mulin's eyes sharpened.
"Strong."
The first one smiled.
"Of course."
It pushed again.
Another beam came.
Then another.
The sky around it flickered with dark pressure as if it could keep producing force without losing balance.
Gu Yanshu lowered one hand and drew his sword with the other.
The blade came out cleanly.
He removed his gloves and placed them away.
The first one's gaze shifted down to that movement.
Then its smile widened.
"You are the Deadly Traveler."
Gu Yanshu said nothing.
The first one's eyes sharpened with recognition.
"So it is you."
The sword in its hand merged with another streak of dark force.
The weapon changed shape for a breath, then settled into something sharper and heavier than before.
Qu Yaoyang moved to the side slightly, giving Gu Yanshu a better line.
Lan Wege held position with measured calm.
Qiu Weiran watched the airborne figure closely, reading the pattern of its force.
Yu Chang stayed ready, eyes fixed upward.
He Mulin guarded the rear angle.
Gu Yanshu looked up at the first one and said, "Give me information."
The first one laughed.
"No."
Then it added, still grinning, "You might be the one people call Deadly Traveler, but I am not giving you anything for free."
Gu Yanshu lifted the sword slightly.
"Then I take it."
The first one attacked again.
Dark beams cut across the space between them.
Gu Yanshu blocked the first, turned the second, and stepped through the third with a controlled shift in his feet.
The force hit the barrier and cracked it slightly, but it did not break.
The first one moved in closer.
Gu Yanshu's sword flashed once.
Then he cut into the lower part of the figure's movement.
The impact was clean.
The first one dropped a little, then pulled back and regenerated its shape in the air with a violent pulse of power.
Yu Chang's eyes widened.
"It recovered that fast?"
He Mulin's jaw tightened.
"That is too much recovery."
The first one smiled as if it had heard that.
"Strong enough for you?"
Gu Yanshu's eyes stayed fixed.
"Strong enough."
That answer seemed to please it.
The first one raised its blade and let the dark beam wrap around it again.
Then said, almost casually, "You really are the guy. I heard the rumors. Deadly Traveler. Gu Yanshu."
Gu Yanshu's gaze did not move.
"Yes."
The first one's grin sharpened.
"Good. That means you are worth speaking to."
Then it lowered slightly in the air.
"Who are you people really? You were able to stop my path and hit me once. That is already rare."
Qu Yaoyang's voice came out cold.
"We are not here for your approval."
The first one glanced at him.
Then at the rest.
Then smiled again.
"Interesting."
Gu Yanshu did not waste the opening.
"Who said the word?"
The first one's smile held.
"Why should I answer you?"
"Because you already know who I am."
"That is not a reason."
Gu Yanshu's sword moved a fraction higher.
"You want to keep standing. I want information. We can solve this one way or another."
The first one looked amused.
"Then solve it."
It lifted its blade and released a wider burst of dark force.
The blast struck down toward the street below and shattered a section of stone.
The group rose higher to avoid the edge of the shock.
Gu Yanshu used the movement to press closer.
One clean cut.
Then another.
The first one turned its weapon and blocked the line of attack, then forced back with a dark pulse that made the air flare around them.
He Mulin narrowed his eyes.
"It is not just power."
Qiu Weiran nodded.
"It's control over the force shape."
Lan Wege looked at the pattern of the beams.
"And it is fighting without losing balance."
Yu Chang stayed alert.
"If we keep letting it fly, it keeps the advantage."
Gu Yanshu heard all of it.
He cut the next beam in half and moved the battle lower.
The first one smiled wider.
"So you do think."
Gu Yanshu answered coldly, "Speak."
The first one did not.
Instead it shot a narrower beam toward Gu Yanshu's shoulder.
Gu Yanshu twisted aside and countered with a low slash.
The first one regained its distance with a pulse of force, then landed lightly on a broken rooftop nearby.
Its eyes stayed on Gu Yanshu.
"You want to know what happened here," it said.
"Then you came to the right place."
Gu Yanshu's gaze sharpened.
That was the first real answer.
He pressed harder.
"Who is saying the word?"
The first one tilted its head slightly.
"You know part of it already."
Then it glanced down at the knocked-out figure on the street.
"One of mine was near the wrong person. The word worked."
Qu Yaoyang's eyes narrowed.
"Worked how?"
The first one looked at him.
"Like a lock."
The air changed around the group at that answer.
A lock.
A trigger.
A condition.
Gu Yanshu's face stayed still, but his mind was moving faster now.
The second figure had been hit by the word.
That meant the street explosion was not random at all.
It was a test.
A signal.
Maybe even a warning.
The first one watched his expression.
Then laughed once.
"You understand now."
Gu Yanshu spoke immediately.
"Who sent you?"
The first one's smile disappeared for only a moment.
Then came back.
"You ask too quickly."
The rooftop beneath its feet cracked slightly under the pressure of its force.
Gu Yanshu did not move back.
His sword remained up.
"Answer."
The first one looked at him a long moment.
Then spoke.
"Not here."
The answer was short.
Clean.
Enough to matter.
Lan Wege's eyes sharpened.
"So you are avoiding the place too."
The first one gave a faint smile.
"I avoid stupid questions."
Yu Chang's face tightened.
"This is getting nowhere."
Gu Yanshu looked at the first one, then at the smoke still rising from the shattered street.
He had enough now to know one thing.
The explosion was a message.
The word was a trigger.
The first one was not the source.
It was the first body strong enough to stand in the middle of the aftermath and force attention away from the real center.
That made his expression settle again.
The first one noticed the change.
Then glanced at the others.
"You are very careful."
Gu Yanshu answered.
"I need information."
The first one nodded.
"That is your weakness."
The sentence struck cleanly.
Not because it was new.
Because it was true.
Gu Yanshu did not deny it.
The first one smiled wider.
"Good. Then you are still alive enough to learn."
It moved back into the air.
Then it said, "If you want the rest, follow the smoke."
Qu Yaoyang's gaze sharpened.
"The smoke?"
The first one's dark blade shifted in its hand.
"Or do not. That choice is yours."
Then it lifted higher into the sky.
The force around it gathered again, but not to attack this time.
To leave.
Before it vanished, it turned its head once more and looked directly at Gu Yanshu.
"You are not the only one searching for the place behind the words."
Then it disappeared into the smoke and higher air, leaving the broken street behind.
No one moved for a moment.
Yu Chang was the first to speak.
"Follow the smoke?"
He Mulin looked toward the shattered street below.
"That sounds like a trap."
Qiu Weiran's tone stayed low.
"Yes."
Lan Wege glanced at Gu Yanshu.
"But it is also a lead."
Gu Yanshu looked at the place where the first one had vanished.
Then he said one word.
"Move."
The group descended back toward the street.
The explosion had already split the road into several broken sections.
Dust still drifted through the air.
The knocked-out figure lay where it had fallen.
Qu Yaoyang looked at it and then at the cracks around the area.
"The word did that."
Gu Yanshu nodded.
"Yes."
He Mulin crouched slightly and examined the shattered stone.
"It was not just force. It was a condition."
Yu Chang stayed close to the edge, looking uneasy.
"So if someone says it again…"
Gu Yanshu answered, "It may happen again."
That made the room around them feel colder.
The street was now quiet enough to hear distant movement from deeper in the city.
Not the explosion itself.
The aftermath.
The sound of people moving somewhere beyond the smoke.
Gu Yanshu looked in that direction.
Then at the figure on the ground.
Then at the place the first one had left behind.
The answer was still incomplete.
But one thing was clear.
Information was his weakness.
That did not mean he had to stay weak.
He looked at the others.
"We follow the lead."
Qu Yaoyang nodded once.
Lan Wege did the same.
Qiu Weiran kept his attention on the route ahead.
He Mulin stood up from the broken stone.
Yu Chang took one breath and steadied himself.
Then the group moved forward into the city, following the smoke trail the first one had left behind, while the shattered street cooled behind them and the word still hung in their minds like a warning that had already begun to work on the world.The smoke did not rise straight.
It bent.
Slow at first, then with more purpose, like something in the air had already decided where it wanted the group to look.
Gu Yanshu watched it from the broken street below while the others stayed close around him.
The first blacker had gone, but the pressure it left behind still stayed in the area. The knocked-out figure on the ground had already been dragged aside by the shock of the earlier blast. The shattered stone, the burnt edge of the road, and the dark traces in the dust all told the same thing.
Something had happened here on purpose.
Not a random attack.
Not a normal fight.
A signal.
Qu Yaoyang looked at the smoke and then back toward Gu Yanshu.
"Are we really following that?"
Gu Yanshu did not answer right away.
He was looking at the direction the smoke had curved toward.
There was a narrow road between two buildings.
Not wide.
Not open.
A path that looked ordinary until one noticed that every nearby wall had been hit by the blast at the same angle.
That meant the force had been directed.
The smoke was not drifting.
It was leading.
"Yes," Gu Yanshu said at last.
"Carefully."
No one argued.
They moved forward as a group, staying low and tight to the route.
The city around them had changed after the explosion.
Some windows were broken.
A few wall panels had cracked open.
The air still smelled faintly burned.
People farther away had already started to avoid the street where the blast had happened, but no one came close enough to stop them.
That gave the group room.
And room mattered.
Lan Wege walked a little ahead, his eyes fixed on the rooftops and wall corners.
Qiu Weiran kept checking the ground markings.
He Mulin stayed near the right side, where the route narrowed near a line of low stone steps.
Yu Chang kept glancing behind them as if he expected the first blacker to return from the smoke at any second.
Qu Yaoyang stayed closest to Gu Yanshu.
Not because he needed to protect him.
Because he knew Gu Yanshu was already measuring the path ahead, and any sudden change in movement could matter.
The smoke marked a turn.
Then another.
Then disappeared into a narrower road lined with old buildings.
Not destroyed.
Not abandoned.
Just older than the rest.
Gu Yanshu stopped at the turn and looked at the wall ahead.
There were marks there.
Thin scorch lines.
Several of them.
All at the same height.
He Mulin noticed them too.
"These are beam marks."
Qiu Weiran stepped closer and examined the edge.
"Not random. Repeated."
Lan Wege's gaze sharpened.
"Someone has been using this street often."
Yu Chang looked uneasy.
"Or something has."
Gu Yanshu touched one of the blackened lines with his fingertips.
It was still warm.
The first blacker had moved through this place often enough to leave traces.
That meant the smoke lead had a real destination.
Not just a bluff.
A route used by someone who knew the city better than he had first assumed.
He looked ahead again.
The street opened slightly farther down, and from there the smoke split into two faint streams.
One climbed upward.
One went deeper into the lower road section.
Qiu Weiran saw it and frowned.
"Two paths."
Gu Yanshu stared for a second longer.
"Only one matters."
He pointed toward the lower road.
"The upper one is a distraction."
Yu Chang looked at the other route and then back.
"How do you know?"
Gu Yanshu turned once, his voice calm.
"The lower road has no pedestrians. The upper road does."
That made the group look again.
A few people were already moving at the upper edge of the street.
Not many.
Just enough to make the route look active.
That made it obvious.
A real lead would avoid attention.
A bait route would invite it.
The group turned downward.
The lower road grew darker as they moved into it.
The buildings here stood closer together, and the light had a harder time reaching the ground. The walls on both sides carried old marks from previous damage, but not enough to suggest collapse. Enough to show that this section of the city had survived many things without being fully repaired.
Gu Yanshu slowed at the next corner.
There was a sound ahead.
Not shouting.
Not footsteps.
A low, irregular scrape.
He raised one hand.
The others stopped instantly.
From around the next building, a faint black residue drifted outward in the air.
Not smoke from fire.
Something denser.
Something built from force.
He Mulin's expression tightened.
"The first blacker was here recently."
Qiu Weiran looked at the road surface.
"There are drag marks too."
Gu Yanshu stepped forward just enough to see the corner.
Then he stopped again.
The road ahead had been broken by a second impact.
Not a blast.
A strike.
The stones were split in a curved line.
That meant the weapon had been swung close to the ground and then lifted.
A controlled attack.
Clean.
Purposeful.
The kind of strike that was meant to force someone into a particular direction.
Yu Chang whispered, "He moved through here like he was steering the whole street."
Gu Yanshu stayed silent.
Then he turned slightly to Qu Yaoyang.
"Look at the walls."
Qu Yaoyang did.
Then his eyes changed.
There were scratches there.
Not from the blast.
Marks.
Short, repeated lines cut into the surface at intervals.
Not random either.
Symbols.
Small enough that someone standing at a distance would not notice.
Qiu Weiran moved closer and bent slightly.
"These are words."
He Mulin looked over.
"What words?"
Qiu Weiran traced the cuts with his eyes.
"Not full characters. Partial ones."
Lan Wege frowned.
"Can you read them?"
Qiu Weiran shook his head once.
"Not from here."
Gu Yanshu looked at the wall for a second longer.
Then stepped closer.
The cut marks were shallow.
But they had been made with care.
Someone had written in the city wall like the walls themselves were meant to remember.
He read one line.
Then another.
The second line was incomplete.
But one phrase stood out.
The sin returns where silence ends.
The others saw his expression sharpen.
Yu Chang noticed first.
"What is it?"
Gu Yanshu did not answer immediately.
He looked farther down the street.
There was another turn.
Another layer of road below it.
The smoke had already disappeared there.
He had found the beginning of something.
A trail.
And a message.
"This is not only a path," he said.
"It is a loop."
Qu Yaoyang looked at the wall writing again.
"Then the first blacker knows where people will move."
"Yes."
Gu Yanshu's voice stayed flat.
"He wrote where the route would be remembered."
That made the group quiet for a second.
The first blacker had not just fought.
He had marked the city.
That meant he was either expecting someone to follow him, or he wanted the city to become a map by itself.
The lower road opened into a wider section.
Not a square.
A crossing point.
The kind where multiple alleys met and then moved apart again.
In the center of that crossing sat a broken cart.
One wheel was still spinning slowly.
He Mulin looked at it.
"Fresh."
Lan Wege scanned the roofs above.
"There could still be someone here."
Gu Yanshu did not reply.
He stepped toward the cart and stopped near the wheel.
The spinning slowed.
Then stopped.
On the side of the cart frame was another mark.
Not a sword mark.
A handprint.
Blackened.
Too deep to be accidental.
Yu Chang stared at it.
"That's from the first blacker."
Gu Yanshu nodded slightly.
Then he looked across the crossing.
A man was lying farther ahead near the edge of the alley.
Not moving.
Not dead in a way that could be seen from this distance.
Just down.
The group did not rush to him.
They watched.
He Mulin looked toward the alley behind the body.
"There's a trail."
Qiu Weiran narrowed his eyes.
"Not blood. Force residue."
Gu Yanshu stepped forward.
The man on the ground wore city guard clothing.
Not official.
A lower rank.
Someone who had likely been in the wrong place when the first blacker passed through.
Gu Yanshu crouched beside him.
The man was breathing.
Shallow.
But breathing.
He Mulin stayed close, ready in case of movement.
Gu Yanshu checked the collar and the side of the neck.
Then looked at the man's face.
The eyes were half-open.
Not focused.
Qiu Weiran asked quietly, "Can he speak?"
Gu Yanshu looked up once.
"We will see."
He pressed two fingers lightly near the man's wrist.
The pulse was weak.
But present.
Then the man's fingers moved.
Just once.
Yu Chang stiffened.
"He's awake."
The man's eyes shifted.
He saw Gu Yanshu.
Then the others.
Then tried to sit up and failed.
Gu Yanshu kept his voice calm.
"Who passed here?"
The man's mouth moved.
At first nothing came out.
Then a rough whisper.
"The one in the sky."
Qu Yaoyang asked, "The first blacker?"
The man's face twitched and he nodded once.
Gu Yanshu kept the question short.
"Where did he go?"
The man swallowed.
Then spoke with effort.
"Down…"
A cough.
Then, "He went down… after the noise…"
Lan Wege narrowed his eyes.
"Did anyone chase him?"
The man shook his head very slightly.
"No one could…"
His voice cut off.
Then he tried again.
"He said… you are the sin…"
The last part came out broken.
Not because the man was lying.
Because he was trying to force his memory through pain.
Qiu Weiran's gaze sharpened.
"He used the phrase again."
Gu Yanshu nodded.
"Yes."
He looked at the man again.
"Did he say anything else?"
The man's eyes drifted, then came back.
"A gate…"
He coughed again.
"Under the city…"
He Mulin leaned in slightly.
"Where under the city?"
The man shook his head.
"Don't know…"
Another breath.
"Too fast…"
Gu Yanshu held his gaze steady.
"Who was he chasing?"
The man hesitated.
Then answered with a weak shake of the head.
"No one… he was looking for something…"
That was enough.
Gu Yanshu stood.
The man had not given them much.
But the little he had said mattered.
The first blacker had been chasing something.
Not someone.
Something.
And he had gone under the city.
Qu Yaoyang glanced down the alley.
"So the smoke was a lead into the lower structure."
"Yes," Gu Yanshu said.
"Now we know that much."
Yu Chang looked uneasy again.
"The city has a lower structure too?"
He Mulin glanced at the street tiles.
"Most cities do."
Qiu Weiran added quietly, "Some more than others."
Gu Yanshu looked at the man on the ground one more time.
Then back at the alley.
The route under the city was the real lead.
The first blacker had only passed through the upper roads to force attention outward.
That meant he was either hiding the path below, or using the street violence to keep people from noticing what was deeper down.
That fit the pattern.
The map.
The archive.
The route.
The hidden books.
Everything kept showing the same habit.
A visible layer to hide the working layer.
He straightened and turned.
"Move."
The others followed.
The alley narrowed again after the crossing.
At the far end, the ground lowered slightly.
Not much.
Enough for the city's old drainage and route lines to show through.
The walls here were older than the road above.
One of them carried a weathered metal plate that had been cut into the stone long ago.
Qiu Weiran bent toward it and wiped some dust away.
Under the dust was a line of characters.
Not a full sign.
Just enough to read.
He stared for a moment.
Then looked at Gu Yanshu.
"This says access to the lower line is restricted."
Lan Wege's eyes narrowed.
"There's a lower line after all."
He Mulin checked the wall join at the left side.
"This plate has been opened before."
Yu Chang looked uneasily at the alley floor.
"So the first blacker went this way."
Gu Yanshu did not answer.
He was already looking at the plate.
The writing was old.
It had been covered over more than once.
And beneath the scratches, one other phrase had been left deeper in the metal.
Not a warning.
A condition.
Qiu Weiran saw it too and read it softly.
"Only those who know the route can return."
That made the alley go quiet.
Qu Yaoyang looked at Gu Yanshu.
"That sounds like the archive."
"Yes."
Gu Yanshu pressed the plate lightly.
No change.
Then he placed two fingers on the lower edge and pushed.
A faint sound answered.
The plate shifted inward.
Yu Chang's eyes widened a little.
"It opened."
A narrow stairway led down beneath the wall.
Dark.
Steep.
Used.
The air rising from below was colder.
And it carried a faint trace of the same pressure the first blacker had left behind.
He Mulin looked down the stairway.
"That's where he went."
Gu Yanshu looked down too.
The steps were worn.
That meant frequent use.
Not recent only.
Repeated.
Qiu Weiran asked quietly, "Do we go in?"
Gu Yanshu did not answer right away.
He listened.
The lower route did not sound empty.
There was a faint resonance deeper inside.
Like the city itself was carrying a second layer of movement below the streets.
He looked at the others.
The first blacker had given them a lead.
Not enough information.
But enough to move.
He had also said one important thing without meaning to.
He had recognized Gu Yanshu.
That meant the name had already begun to move ahead of him.
The Deadly Traveler.
Not a rumor anymore.
A label that could travel.
Gu Yanshu looked down the stairway again.
Then said, "We enter carefully."
No one hesitated.
He Mulin went first.
Then Lan Wege.
Then Qiu Weiran.
Yu Chang followed.
Qu Yaoyao held the rear while Gu Yanshu stayed near the middle, one hand on the sword and the other near the map still folded away.
The stairway below opened into a narrow passage under the city.
The walls were stone.
The floor had a thin line of old water damage along one edge.
The route bent downward, then leveled out.
At the end of the passage was another open section.
A chamber.
Not large.
But wide enough to hold a few carts and a long line of crates stacked against the wall.
And on the floor—
another mark.
This one darker than the others.
A clean black line across the center of the room.
He Mulin stopped.
"This is fresh."
Qiu Weiran looked at it carefully.
"It wasn't here long ago."
Yu Chang stared at the line.
"It feels like a boundary."
Gu Yanshu stepped forward one pace.
The pressure in the room changed.
Not strong.
Exact.
The line on the floor was not decoration.
It was a warning.
Or a trigger.
Or both.
Then, from the far side of the chamber, a small sound came.
Metal against stone.
Once.
Then again.
The group turned.
A figure was standing near the back wall.
Not the first blacker.
Different.
Someone smaller.
Wrapped in a dark cloak.
The face was hidden.
The figure raised one hand slightly, and a low voice came out from under the hood.
"You came faster than expected."
Gu Yanshu's gaze stayed steady.
"Who are you?"
The figure did not answer immediately.
Instead, it looked toward the black line on the floor.
Then back at Gu Yanshu.
"You followed the smoke."
He Mulin's expression hardened.
"So this was the place."
The figure ignored him.
Its attention stayed on Gu Yanshu.
"You're looking for information."
Gu Yanshu said nothing.
The figure's voice stayed calm.
"That is good. Information is expensive here."
Qiu Weiran frowned.
"Then sell it."
The figure gave the faintest sound of amusement.
"Not to all of you."
Yu Chang's hand tightened.
Gu Yanshu took one more step forward, then stopped at the edge of the black line.
The figure's voice lowered.
"Cross that line, and you learn something."
Gu Yanshu looked at it.
"And if I do not?"
The figure's pause was short.
"Then you leave with less than you came for."
Silence.
The chamber held itself still around them.
Then Gu Yanshu asked one question.
"What is below this room?"
The figure's head tilted slightly.
Then it answered.
"A place where the sin is no longer a word."
The room went quiet after that.
Not because the answer was complete.
Because it was enough to change the shape of the next choice.The figure did not move.
The black line between them held the space still, like the room itself had drawn a boundary and was waiting to see who would break it first.
Gu Yanshu looked at the line once.
Then he stepped over it.
No hesitation.
No pause.
His foot crossed, then his full weight followed.
The moment he entered the other side, the air shifted.
Not violently.
Tighter.
More aware.
He Mulin's eyes sharpened at once, but he did not follow yet.
Lan Wege watched the figure.
Qiu Weiran watched Gu Yanshu.
Yu Chang stayed near the edge, his breath slower now.
Qu Yaoyang remained behind, guarding the rear without moving forward.
The figure's head tilted slightly.
"You didn't test it."
Gu Yanshu stood still on the other side.
"There was nothing to test."
The figure gave a small pause.
Then a low sound, almost like a short breath.
"Confidence or calculation."
Gu Yanshu did not answer.
He was watching the room.
The black line behind him had not changed.
The floor had not broken.
The walls had not moved.
But the pressure in the space had focused.
The figure raised one hand again.
A faint click echoed from somewhere deeper in the wall.
Then another.
Behind the figure, a narrow panel slid open.
Darkness beyond.
A deeper passage.
He Mulin spoke, voice low.
"That opened after he crossed."
Qiu Weiran's eyes narrowed.
"So the line was a condition."
Lan Wege added, "A filter."
The figure lowered its hand.
"You came for information."
Gu Yanshu looked at the opening behind it.
"Yes."
The figure stepped slightly to the side.
Not fully clearing the path.
Just enough to show it existed.
"Then follow."
Gu Yanshu did not move immediately.
He looked at the others.
Then gave a small nod.
He Mulin crossed next.
His step was controlled.
The air shifted again, but less than before.
Lan Wege followed.
Then Qiu Weiran.
Yu Chang hesitated for a second.
Then crossed.
Qu Yaoyang came last.
The moment all of them stood beyond the line, the chamber behind them dimmed slightly.
Not darker.
Just… quieter.
As if the room had finished its part.
Gu Yanshu stepped forward.
The figure turned and walked into the opening without looking back.
The group followed.
The passage beyond was narrower than expected.
The walls were smooth stone, but the surface had been cut with long horizontal lines at intervals.
Not decoration.
Markers.
Qiu Weiran traced one lightly with his eyes.
"These are levels."
He Mulin glanced along the wall.
"Depth markers."
Lan Wege stayed silent, scanning ahead.
The passage sloped downward.
Slow at first.
Then deeper.
The air changed with it.
Cooler.
Denser.
Yu Chang swallowed once.
"It feels heavier."
Gu Yanshu walked at a steady pace.
The figure ahead moved without sound.
Step after step.
No hesitation.
No pause.
They reached a turn.
Then another.
Then the passage opened.
A larger chamber.
Wider than the last.
Higher ceiling.
And at the center—
a circular platform.
Stone.
Raised slightly above the floor.
Around it, several thin pillars stood at equal distance, each marked with shallow carvings.
The figure stopped at the edge of the platform.
Then turned.
"This is where information changes value."
Gu Yanshu stepped closer.
"How?"
The figure looked at him.
"Above the city, information is gathered."
A small pause.
"Below the city, it is weighed."
Qiu Weiran's gaze sharpened.
"Weighed by what?"
The figure did not answer directly.
Instead, it gestured toward the platform.
"Stand there."
Gu Yanshu did not hesitate.
He stepped onto the platform.
The moment his foot touched the center, the carvings on the pillars lit faintly.
Not bright.
Just enough to show the lines.
He Mulin's expression tightened.
"It's reacting again."
Lan Wege watched the floor.
"Another system."
The figure spoke again.
"Speak what you seek."
Gu Yanshu stood still.
Then said one word.
"The sin."
The chamber answered.
Not with sound.
With pressure.
A low vibration moved through the platform.
The pillars dimmed.
Then brightened again.
Qiu Weiran's eyes widened slightly.
"It recognized the term."
The figure nodded once.
"That word has weight here."
Gu Yanshu spoke again.
"Who is the first blacker?"
The platform pulsed once.
Then stilled.
No answer.
The figure said quietly,
"Wrong direction."
He Mulin frowned.
"What does that mean?"
The figure looked at him.
"You are asking for identity."
A pause.
"This place answers function."
Gu Yanshu understood.
He shifted the question.
"What does the first blacker do?"
The platform reacted again.
Stronger this time.
The pillars glowed brighter.
Then one line formed across the surface of the stone beneath his feet.
Faint.
But readable.
It marks.
The glow faded.
Yu Chang stared.
"That's it?"
Qiu Weiran shook his head slightly.
"No. That's the answer."
Lan Wege's eyes narrowed.
"It marks."
He Mulin looked toward Gu Yanshu.
"The city… the walls… the paths…"
Gu Yanshu stepped off the platform.
"It marks the route."
The figure gave a small nod.
"Closer."
Gu Yanshu looked at it again.
"The sin."
The figure did not move.
Gu Yanshu continued.
"What does the sin do?"
The platform reacted before he even stepped back onto it.
A stronger pulse.
The pillars lit fully this time.
The chamber tightened.
Then—
a new line appeared.
It returns.
Silence followed.
Yu Chang's voice lowered.
"Returns… where?"
Qiu Weiran's expression changed.
"The wall writing."
He Mulin nodded.
"The sin returns where silence ends."
Lan Wege looked toward the deeper passage beyond the chamber.
"So something is repeating."
Gu Yanshu turned back to the figure.
"What is below this?"
The figure held his gaze.
Then answered.
"The place where the return completes."
That was enough.
Gu Yanshu stepped off the platform fully.
The lights faded.
The chamber returned to its earlier state.
Still.
Quiet.
Controlled.
He looked at the figure once more.
"You brought us here."
The figure did not deny it.
"Yes."
"Why?"
A short pause.
Then—
"Because you could reach it."
No more explanation.
No extra words.
Gu Yanshu accepted that.
He turned toward the deeper passage.
The one beyond the platform.
Darker.
Narrower.
More final.
He started walking.
The others followed without hesitation.
The next passage felt different from the others.
Less structured.
The walls were rougher.
The floor carried deeper marks.
Like something had been dragged through here more than once.
Yu Chang noticed it first.
"These lines…"
He Mulin looked down.
"Weight marks."
Qiu Weiran added quietly,
"Something heavy passes here."
Lan Wege kept his eyes forward.
"Recently."
The air grew colder again.
The passage bent once.
Then opened.
Another chamber.
Larger than expected.
The ceiling rose high above.
The walls curved slightly inward.
And at the center—
a pit.
Not wide.
But deep.
Dark.
No visible bottom.
Around the edge of the pit were several metal frames fixed into the stone.
Old.
Worn.
Used.
Gu Yanshu stopped at the edge.
He looked down.
No light returned.
Just depth.
Behind him, the figure spoke one last time.
"This is where the sin returns."
Gu Yanshu did not turn.
He was already looking at the pit.
The marks around it.
The frames.
The worn edges.
Everything pointed to one thing.
Something came here.
Again and again.
Not to be stored.
To be sent.
Or to fall.
Or to return.
He Mulin stepped beside him.
"This isn't just a pit."
Gu Yanshu nodded slightly.
"No."
Qiu Weiran's voice lowered.
"It's a gate."
Lan Wege added,
"A vertical one."
Yu Chang swallowed.
"What comes out of it?"
No one answered.
Because the question had already been answered earlier.
The sin returns.
Gu Yanshu stepped closer to the edge.
The air from below moved slightly.
Not wind.
Not heat.
Movement.
Slow.
Measured.
Rising.
He stood there.
Watching.
Waiting.
Then—
from deep below—
a faint sound reached them.
Not a voice.
Not a scream.
A single impact.
Far down.
Then silence again.
Gu Yanshu did not move.
His eyes stayed on the darkness.
The path had led here.
From the archive.
To the city.
Through the routes.
Into the lower layer.
Everything had been guiding toward this point.
Not by chance.
By design.
He said quietly,
"This is where it begins."Gu Yanshu looked down into the pit.
The air moved again from below.
Slow.
Measured.
Like something deep underneath had shifted its weight and was waiting to see who would answer first.
He Mulin stepped closer to the edge.
His eyes stayed fixed on the darkness.
"This goes down farther than I expected."
Qiu Weiran looked along the rim and then at the metal frames set into the stone.
"These frames are for descent."
Lan Wege lowered his voice.
"They were used often."
Yu Chang stood a little behind the others, his attention split between the pit and the passage behind them.
"Someone built this to move through the city from below."
Gu Yanshu kept his gaze on the darkness.
The pit carried old pressure.
The kind that stayed in stone for a long time after the people who built it had gone.
He heard a faint sound from below.
A slow metal tap.
Then another.
The figure behind them spoke once.
"This is the place."
Gu Yanshu turned his head slightly.
"You brought us here."
The figure stayed where it was.
"Yes."
Qu Yaoyang's eyes narrowed.
"Why?"
The figure's hood shifted a little.
"Because you asked the right question."
Gu Yanshu looked back at the pit.
The right question.
That was all the answer he needed for now.
The lower city had already shown him a pattern.
The first blacker moved through force.
The mark in the wall carried a route.
The smoke lead pointed toward a layer below.
This pit matched the same shape.
He stepped to the nearest frame and tested it with one hand.
Solid.
Old iron.
Still fixed into the stone.
He Mulin moved beside him.
"The wall here can support a climb."
Qiu Weiran checked the next frame lower down.
"These are aligned."
Lan Wege looked into the pit again.
"If we go down, we'll enter a deeper route."
Yu Chang's face stayed tense.
"That route leads to the sin chamber."
Gu Yanshu nodded once.
"That is where the information is."
He did not wait any longer.
He grabbed the first frame and lowered himself down.
The others followed in sequence.
He Mulin went second.
Then Qu Yaoyang.
Then Lan Wege.
Then Qiu Weiran.
Yu Chang came after them, keeping his eyes upward until the last second.
Gu Yanshu kept one hand on the frame and one on the wall as he descended.
The pit was deep.
The farther down he went, the colder the air became.
The stone held old moisture.
The silence changed too.
Above, the city noise had already faded.
Below, the darkness carried a faint resonance that seemed to answer each movement of the group.
The frames went down for a long stretch.
Then ended at a ledge.
Gu Yanshu stepped onto it first.
A narrow landing stretched ahead.
The stone floor had shallow grooves cut into it, all running in the same direction.
He Mulin stepped onto the ledge and looked at the grooves.
"Route lines."
Qiu Weiran crouched and touched one with his fingers.
"They're recent enough to still hold shape."
Lan Wege looked forward.
"There's a chamber ahead."
Yu Chang came off the frame last and looked back at the pit above.
"It seals from above."
Gu Yanshu turned toward the corridor ahead.
The passage was narrow.
The walls were close.
The same shallow grooves continued along the floor, guiding the way down and then forward.
No decorations.
No signs.
Only direction.
The group moved in silence.
The corridor bent once, then again, and opened into a larger chamber with a low ceiling.
The room had stone pillars arranged in a rough ring.
At the center stood a square platform, and around the edge of that platform lay broken chains, discarded rings, and two collapsed lantern supports.
He Mulin looked at the broken pieces.
"This place was used for holding someone."
Qiu Weiran stepped toward the center and frowned.
"Or something."
Gu Yanshu looked around the chamber slowly.
The walls carried old cut marks.
Many of them.
Thin grooves that formed a repeating pattern.
Not words.
Routes.
A system of movement, force, and return.
Yu Chang's eyes stayed on the floor.
"There are footprints."
Lan Wege moved closer to inspect them.
"Several people came through here."
Qu Yaoyang looked at the ring of pillars.
"Some were standing still."
Gu Yanshu looked at the broken chains.
Then at the middle platform.
A stain had remained on the stone there.
Dark.
Old.
Dry.
Something had been kept on that platform for a long time.
He Mulin noticed the way Gu Yanshu was looking.
"Lord, this room has been used for judgment."
Gu Yanshu answered, "Yes."
He walked to the platform and stopped at its edge.
The center of the stone had a shallow carved circle.
Inside the circle were three names.
The cut marks were older than the rest of the room, but they had been traced more than once after the first carving.
Qiu Weiran bent closer.
"These names were kept visible."
Yu Chang frowned.
"Why would anyone leave names like that here?"
Gu Yanshu stared at the circle.
"Because they matter."
He crouched and read the names one by one.
The first had been scratched and recut so many times that the lines looked dark with age.
The second had been crossed once and then carved over.
The third was shallow and clean.
He stood again.
"They are not dead names."
Lan Wege looked at him.
"What are they then?"
Gu Yanshu turned slightly.
"Markers."
Qu Yaoyang's eyes sharpened.
"For what?"
Gu Yanshu looked along the wall grooves again.
"Return."
A faint sound moved through the chamber.
Not from the door.
From deeper inside.
The figure in the hood had followed them down the route and now stood near the corridor entrance, half in shadow.
Its voice came calmly from behind them.
"You found the first chamber."
Gu Yanshu did not turn all the way around.
"How many chambers are below this one?"
The figure answered at once.
"Enough."
He Mulin's hand moved slightly toward his weapon.
Qiu Weiran watched the figure with hard focus.
"Speak clearly."
The figure's hood shifted.
"You came for the path. The path answers in layers."
Gu Yanshu looked at the three names on the platform again.
Then he stepped off the stone and moved toward the far wall.
There, barely visible, another seam.
Lower than the others.
Set into the stone behind one of the pillars.
He stopped there.
The wall felt different.
Colder.
Thicker.
And faintly hollow behind the surface.
He pressed the seam.
A soft click answered.
The stone shifted inward by a fraction.
He Mulin stepped closer.
"There's another room behind it."
Gu Yanshu pressed again.
The wall opened wider.
A narrow passage appeared.
The air from inside had a different weight.
It carried dust, iron, and something faintly burnt.
Lan Wege's eyes narrowed.
"That smell is the same as the street."
Qiu Weiran looked into the opening.
"So this leads to the first blacker's trail."
Gu Yanshu stepped inside first.
The others followed.
The new chamber was longer.
Lower.
The ceiling sat close enough to make the room feel compressed.
Along the walls stood rows of stone shelves.
Most were empty.
A few held dark slabs with route inscriptions on them.
Several long wooden boards leaned together at the far side of the room.
The boards were marked with black lines and names.
Yu Chang looked at them and swallowed lightly.
"What is this place?"
Gu Yanshu moved toward the nearest board.
"It stores route records."
Qiu Weiran stepped beside him and read the top line.
"These are city movement boards."
He Mulin checked the shelf lines.
"And this room was active for a long time."
Lan Wege ran his gaze over the slabs.
"Some were taken out."
Gu Yanshu picked up one of the boards.
It was heavier than it looked.
The surface had dozens of shallow marks cut into it.
Names.
Locations.
Times.
Some had been crossed out.
Some had been recarved.
He read the first few entries.
Then his eyes tightened.
The board recorded movement through the lower city.
It also recorded restrictions.
One line had been cut repeatedly until the words had become deep enough to feel with a thumb.
The sin line opens when the marked phrase is spoken.
He looked at it again.
Then moved to the next board.
This one had the same layout.
Different names.
Different timings.
And one phrase written at the bottom.
The dead traveler does not stay above long.
He Mulin saw the shift in Gu Yanshu's face.
"What did you find?"
Gu Yanshu held the board out slightly.
"Someone has been tracking movement here."
Qu Yaoyuan looked at the phrase.
"The first blacker."
"Yes."
Gu Yanshu turned the board and looked at the reverse side.
There was another set of marks there.
A route diagram.
He traced it with his eyes.
It led down from the chamber they were in.
Past two lower levels.
Then into a final node.
Yu Chang saw the route and frowned.
"This goes deeper."
Gu Yanshu nodded once.
"It goes where the city keeps its core records."
Qiu Weiran looked up.
"You mean there is a record room below the lower city."
"Yes."
The hooded figure spoke again from the doorway.
"You understand better than most."
Gu Yanshu looked at it.
"You brought us to a record room."
The figure gave a small pause.
"It is a threshold room."
He Mulin asked, "Threshold for what?"
The figure answered, "For what the city remembers."
That made the chamber go quiet.
The boards in Gu Yanshu's hand felt heavier now.
The lower city had become clearer piece by piece.
Not a random underlayer.
A memory system.
Gu Yanshu set the board back onto the shelf and looked at the route lines again.
Then he spoke.
"The first blacker came through here."
The figure did not deny it.
"Yes."
"He marked the city."
"Yes."
"He was chasing something."
The figure's hood shifted slightly.
"Yes."
Gu Yanshu kept his voice steady.
"What?"
The figure did not answer immediately.
Then said, "A name."
The chamber became still.
Yu Chang's eyes widened.
"A name?"
Qiu Weiran's brows drew together.
"What name?"
The figure looked at Gu Yanshu.
"The one that makes the lower route open."
Lan Wege stared at the boards.
"So the city only reacts when the name is found."
The figure gave a slow nod.
"Or spoken."
Gu Yanshu looked down at the route board again.
The sin line.
The dead traveler mark.
The city movement records.
The lower route node.
It all fit too well.
He Mulin looked at the boards too.
"This room is part of the pattern."
Gu Yanshu nodded once.
"Yes."
The figure raised one hand and pointed deeper into the chamber.
"There is a gate at the end."
Qu Yaoyuan's gaze sharpened.
"What gate?"
"The one the first blacker used."
That made the group move immediately.
They crossed the chamber to the far end.
There, beneath a hanging curtain of old metal strips, stood another door.
Thicker than the others.
Bound with layered iron bands.
The surface had old route marks cut into it, and in the center sat a square slot.
Not a lock.
A reader.
Qiu Weiran stepped in close and examined it.
"This needs a marker."
He Mulin looked at the slot.
"A route token."
Lan Wege glanced at Gu Yanshu.
"The board?"
Gu Yanshu looked at the route board in his hand.
Then at the slot.
The fit was clear.
He slid the board into the center.
A hard click sounded.
Then another.
The iron bands shifted.
The door did not open fully.
It gave a slow release and pulled inward just enough to reveal the next room.
The air that came through carried a deeper cold.
The figure behind them stepped back and stayed at the threshold.
"You can go in now."
Gu Yanshu looked at it once.
Then stepped through with the others.
The room beyond was wider than the route chamber.
The ceiling was higher.
The walls carried more marks.
And at the center of the room stood a long stone table with a single black ledger laid open across it.
Gu Yanshu walked toward the table.
The ledger's pages were filled with dense names and route entries.
Not only routes.
Events.
Triggers.
Deaths.
Word triggers.
He read the first few lines.
Then stopped.
One line had been underlined several times.
The phrase had been carved into the page with such force that the letters looked nearly torn.
When the sin is spoken, the lower gate listens.
He turned the page.
Another line.
The return point opens after the first silence.
He stared at the ledger.
The system here was larger than the lower chamber.
This was a record of cause and response.
A map for what happened when words met the right route.
He Mulin looked over his shoulder.
"This is how the first blacker moves."
Gu Yanshu nodded.
"Yes."
Qiu Weiran turned another page.
"There are dates here."
Yu Chang looked at the page.
"Recent ones?"
Qiu Weiran's expression tightened.
"Yes."
Lan Wege moved to the side and looked at the wall marks.
"These aren't only records."
He pointed to one line carved into the stone.
"Someone was checking them often."
The hooded figure remained at the doorway.
Its voice stayed level.
"Now you know why I brought you."
Gu Yanshu looked up from the ledger.
"To read the city."
The figure nodded.
"And to learn what reaches the lower gate."
Gu Yanshu turned one more page.
Then froze.
A name had been written there.
Not the first blacker.
Not the city guard.
His own name.
Gu Yanshu.
The room did not move.
No one spoke.
The page sat open in his hand.
His name appeared once.
Then again on the next line.
Then on the next.
Qu Yaoyuan saw it first.
His voice lowered.
"Lord…"
He Mulin stepped in closer.
"That name was written before we came."
Qiu Weiran bent toward the page.
"The record knew you were coming."
Yu Chang stared at the ledger.
"How far does this go?"
Gu Yanshu kept his hand on the page.
The lower city had already answered him once.
Now it had done something worse.
It had named him inside its own record.
He looked at the line above his name.
A route note.
The Deadly Traveler reaches the threshold and brings the others with him.
Then another line.
The first blacker waits at the return point.
Gu Yanshu lifted his gaze from the page.
The chamber around him had changed again.
The cold had deepened.
The air had become still in a tighter way.
The gate behind them gave one faint sound.
Not open.
Ready.
Gu Yanshu closed the ledger halfway.
Then said quietly,
"He is here."Gu Yanshu closed the ledger halfway.
Then said quietly,
"He is here."
The chamber held still for a breath.
Then the air changed.
A low pressure moved across the stone floor, slow and certain, as if someone had stepped into the lower city from another path and the room had already recognized the weight of it.
He Mulin turned toward the doorway at once.
"The first blacker?"
Gu Yanshu looked toward the gate behind them.
"Yes."
Qiu Weiran's fingers tightened around the edge of the ledger table.
"The record was right."
Lan Wege's eyes moved across the room, then to the far wall, then back to the gate.
"He came here before us."
Yu Chang shifted a little toward the rear line.
"That means he knew the route."
Qu Yaoyang held his stance near the side of the room, calm and ready.
"Then we are in his space now."
The hooded figure by the entrance gave a small movement.
It did not leave.
It only turned its head slightly, as if listening to something farther down the route.
Gu Yanshu stepped away from the ledger table.
The page he had opened still sat in his hand.
His own name remained visible on the line.
Then the next line below it.
The Deadly Traveler reaches the threshold and brings the others with him.
He looked at it once more.
The words sat too cleanly on the page.
Too exact.
As if the lower city had already decided what his arrival meant.
Then another sound reached them.
A scrape.
Very faint.
From behind the sealed gate at the far end of the chamber.
He Mulin turned his head sharply.
"There."
The others listened.
The sound came again.
Metal against stone.
Slow.
Measuring.
Qiu Weiran lowered his voice.
"He is moving behind the gate."
Gu Yanshu held the ledger tighter.
Then he moved first.
No rush.
Just forward.
The others followed him in a tight formation.
The gate at the far end was the same one they had seen from the lower chamber.
Iron bands.
A square reader slot.
Old route marks cut into the frame.
But now the pressure behind it had changed.
It no longer felt sealed.
It felt occupied.
Gu Yanshu stopped in front of it.
The hooded figure stayed near the side wall.
It did not speak.
It only watched.
He Mulin looked at the door and then at Gu Yanshu.
"What do we do?"
Gu Yanshu did not answer at once.
He looked down at the ledger in his hand.
Then at the reader slot.
Then at the lines carved into the floor near the base of the gate.
They were the same route marks he had seen earlier.
But there was one line cut deeper than the others.
A pressure line.
A waiting line.
He raised the ledger.
Then turned it slightly.
The page with his name was still open.
The lower city had already recorded him.
That meant the gate accepted the record, or wanted to.
He slid the ledger back against his sleeve and looked at the others.
"Stay close."
That was all.
Qu Yaoyang nodded once.
He Mulin moved up one step.
Lan Wege shifted to the left side of the door.
Qiu Weiran stayed ready beside the wall.
Yu Chang held position near the rear edge.
The hooded figure remained in place.
Still.
Watching.
Gu Yanshu reached into the slot at the center of the gate and placed the route board against it.
A click sounded.
Then another.
The iron bands on the gate loosened.
The stone frame gave a long dry sound, and the door began to open inward by a narrow line.
Cold air came through first.
Then a deeper smell.
Burnt stone.
Old dust.
And something metallic underneath it.
He Mulin's eyes sharpened.
"That smell again."
Gu Yanshu looked through the opening.
The chamber beyond was larger than the one behind him.
Much larger.
The ceiling rose into darkness.
Several stone pillars stood in uneven rows.
The floor had a long crack running from the threshold toward the center of the room, and along both sides of the crack were old marks cut into the ground in repeated intervals.
Lan Wege looked through the opening.
"This place was used for holding movement."
Qiu Weiran's gaze moved over the pillars.
"Or directing it."
Yu Chang swallowed lightly.
"There are carvings on the floor."
Gu Yanshu stepped through first.
The others followed.
The chamber beyond felt wider in every direction.
At the center stood a broken ring of metal supports.
Some had fallen.
Some remained upright.
The floor around them carried dark scorch marks, as if force had moved through here many times and left the stone worn in the same pattern again and again.
The first blacker stood at the far side of the chamber.
He was not flying now.
He stood on the ground with one foot on a low stone slab, the other planted on the floor.
A dark blade rested in one hand.
The other hand carried a loose thread of black force that drifted around his wrist like smoke with shape.
He looked at them one by one.
Then smiled.
"You came."
Qu Yaoyang stepped forward half a pace.
"You said the route would lead somewhere."
The first blacker gave a small laugh.
"It did."
He turned slightly and tapped the blade against the stone slab under his foot.
This chamber answered with a faint hum.
The sound ran along the floor and disappeared into the walls.
Gu Yanshu looked at the slab.
Then at the black force in the first blacker's hand.
Then back at the marks on the floor.
"You marked this room too."
The first blacker's smile stayed.
"Yes."
Qiu Weiran looked at the floor marks and frowned.
"These are formation lines."
The first blacker glanced at him.
"Close enough."
He Mulin looked at the far wall.
"There's a second gate there."
There was.
At the back of the chamber, half hidden behind one pillar, stood another iron frame.
Thicker than the first.
Lower.
But built in the same style.
Lan Wege's eyes narrowed.
"This room opens twice."
The first blacker looked at him.
"Only if the right people enter."
Yu Chang stayed silent for a breath.
Then asked, "What is behind it?"
The first blacker's grin widened.
"That depends on what you brought down here."
Gu Yanshu's gaze sharpened.
"You want the ledger."
The first blacker did not deny it.
"I want the part with your name."
The chamber stayed quiet after that.
He Mulin moved slightly closer to Gu Yanshu.
Qiu Weiran kept his eyes on the first blacker's hand.
Lan Wege watched the rear gate.
Yu Chang looked between the black blade and the floor lines, uneasy but focused.
Gu Yanshu spoke.
"What does my name do?"
The first blacker laughed once.
"Good question."
He lifted the blade slightly.
"The same question the lower city asked before you entered."
That made the room feel colder.
Qiu Weiran's gaze changed.
"The ledger was prepared before we arrived."
The first blacker nodded.
"Yes."
Gu Yanshu looked at him.
"Who wrote it?"
The first blacker's smile faded by a fraction.
Then he turned his blade and pointed it toward the floor.
"Someone who knows the lower gate."
He Mulin's face tightened.
"That answers nothing."
"It answers enough."
The first blacker took one step forward.
The black force around his wrist tightened and spread down the blade.
A beam line formed along the edge.
Sharp.
Controlled.
Ready.
He looked at Gu Yanshu directly.
"You came here for information."
Gu Yanshu said nothing.
The first blacker continued.
"So did I."
Qu Yaoyang's tone stayed level.
"Then speak."
The first blacker gave a short laugh.
"You think I brought you here to chat?"
Yu Chang's hand tightened.
"Then why?"
The first blacker's eyes shifted to Yu Chang.
"Because the lower city reacts when the wrong name is brought inside."
Gu Yanshu stepped one pace forward.
"What name?"
The first blacker did not answer immediately.
Instead he looked at the ledger in Gu Yanshu's hand.
Then at the open page.
Then back up to Gu Yanshu's face.
"Your name."
No one spoke for a breath.
Then Qiu Weiran said quietly, "That line was written before we entered."
"Yes."
The first blacker turned the blade in his hand once.
"The lower city has a habit. It records the ones who can reach the threshold. It records the ones who can move through the route. It also records the ones the route wants to keep."
Lan Wege looked at him.
"Keep for what?"
The first blacker smiled again, but this time the expression held less amusement.
"Ask the gate."
He moved his blade toward the rear frame.
The second gate behind him gave a low sound.
Not opening.
Answering.
He Mulin's eyes narrowed.
"It knows you."
The first blacker shrugged slightly.
"It knows the route."
Gu Yanshu looked from the gate to the blacker.
Then said, "You said you were looking for something."
The first blacker's eyes sharpened.
"Yes."
"What?"
The first blacker did not answer right away.
The black force in his hand spread a little farther, then drew back into the blade with a faint hiss.
Then he said, "A return point."
That phrase landed hard in the chamber.
Qiu Weiran's eyes moved quickly.
"The ledger mentioned that."
The first blacker nodded once.
"The lower city has one. The archive had one. The route has one. Every structure you have entered leaves a point where movement must come back through."
Yu Chang looked at the rear gate.
"And this is one of them."
"Yes."
Gu Yanshu held the ledger tighter.
Then he looked down at the page where his own name still sat in the middle of the line.
A return point.
A name on record.
A gate behind a chamber.
The first blacker waiting in front of it.
He raised his head.
"You said my name was already inside the system."
The first blacker gave a slow nod.
"It was there before you came down. That means you were marked earlier than you thought."
The room tightened after that.
He Mulin looked at Gu Yanshu.
"Lord…"
Gu Yanshu did not answer yet.
He was reading the shape of the chamber.
The first blacker had not attacked immediately.
He had waited.
That meant the gate mattered more than the fight.
The ledger mattered more than the fight too.
And the name on the page mattered most.
The first blacker saw the shift in his eyes.
Then grinned.
"You are thinking now."
Gu Yanshu looked at him.
"Speak the rest."
The first blacker's expression cooled.
"If I do, you will want to open the gate."
Gu Yanshu said nothing.
The first blacker took another slow step forward.
Black force moved around his feet and cut a thin line in the dust.
"Your ledger is not complete," he said.
"The page you hold only records one side."
Qiu Weiran's gaze sharpened.
"One side of what?"
The first blacker looked at him.
"Movement."
Lan Wege's eyes narrowed.
"There is another side."
"Yes."
He pointed with the black blade toward the rear gate.
"Return."
That word landed in the room and seemed to fit the chamber too well.
He Mulin looked toward the back of the room.
"Then the gate behind you is the return point."
The first blacker smiled.
"Now you are catching up."
Yu Chang stared at him.
"And what happens there?"
The first blacker did not answer directly.
He lifted the blade slightly and glanced at the floor marks under his feet.
Then at the pillars.
Then back at Gu Yanshu.
"Something walks back when the right name is read."
The chamber went still.
No one moved.
Qiu Weiran looked down at the ledger.
Gu Yanshu looked at the page.
The line with his name sat there in plain view.
Then the line below it.
The Deadly Traveler reaches the threshold and brings the others with him.
Yu Chang's voice lowered.
"That sounds like a trap."
The first blacker's smile returned.
"It is a gate."
He Mulin's hand moved slightly toward his weapon.
"The same thing can be both."
The first blacker gave a short breath that almost became a laugh.
"Good answer."
Then he raised his blade and pointed it at the ledger in Gu Yanshu's hand.
"If you want the rest of the route, place the book on the floor."
Gu Yanshu looked at him.
"You want the record."
"I want what opens it."
Qiu Weiran's brows drew together.
"The name line."
The first blacker nodded once.
Gu Yanshu looked at the chamber again.
The rear gate.
The floor lines.
The black slab under the first blacker's foot.
The metal supports at the center.
The whole room was built around a choice.
The gate had already reacted once.
The chamber had already been prepared.
He looked at the blacker again.
"What happens if I do not?"
The first blacker's expression changed.
Only slightly.
Then he answered.
"The gate stays closed."
That was enough to show the real shape of the moment.
The room was waiting for a decision.
The first blacker wanted the ledger.
The lower city wanted the name.
The gate behind him held the return point.
Gu Yanshu did not move yet.
He looked at the others.
Qu Yaoyang's face stayed calm.
He Mulin was ready.
Lan Wege watched the rear gate.
Qiu Weiran stayed focused on the page.
Yu Chang's breathing had slowed again.
Then Gu Yanshu set the ledger down on the floor.
The chamber answered at once.
A low tone moved through the stone ring at the center.
The pillars around the room lit faintly.
The rear gate gave a hard click.
Then another.
The first blacker's smile changed.
"The room heard you."
Gu Yanshu kept his eyes on the ledger.
It sat flat against the stone.
The page with his name remained open.
Then the first blacker spoke one word.
Not loud.
Clear.
"Sin."
The chamber changed.
The black line under the floor began to glow in thin strips.
The stone on the far wall shook once.
The rear gate gave a deeper sound than before.
Yu Chang took a sharp breath.
"He triggered it."
He Mulin shifted.
"Lord—"
Gu Yanshu held up one hand without looking away from the gate.
The floor under the ledger moved.
Just a little.
The page with his name turned on its own.
Qiu Weiran's eyes widened.
"That page is moving."
The first blacker took one step back.
His face had changed.
No smile now.
Only focus.
The ledger page turned again.
Then stopped.
A new line appeared beneath the name.
One that had not been visible before.
Return point accepted.
The room held itself still for one long breath.
Then the rear gate began to open.
Not wide.
Just enough to show a line of darkness beyond it.
Cold air moved through the chamber.
The blacker's eyes tightened.
He Mulin stepped closer to Gu Yanshu.
"Do we stop it?"
Gu Yanshu stared at the opening.
No answer yet.
The page on the floor shifted again.
Then another line appeared below the first one.
One name remains unread.
The chamber went silent.
Yu Chang looked at the ledger.
Qiu Weiran froze.
Lan Wege's eyes sharpened.
The first blacker stepped forward a fraction.
His voice lowered.
"That line was not there before."
Gu Yanshu looked at the page.
The chamber held.
The rear gate stood half open.
The darkness beyond it moved once.
Very faintly.
As if someone or something had taken one step closer from the other side.
Then the ledger page turned one more time.
And the unread name appeared.