Jin Tonghua arrived seven days after his advance relay, which was when he said he would.
He came up the mountain road at the sixth hour of the morning, alone, wearing cultivator travel robes with no insignia — deliberately plain, the kind of clothing that cost money but refused to spend it on display. He was four hundred and thirty years old, which put him at the middle tier of the practitioners Wen Zhao had been dealing with for the past two months. His cultivation was Upper Saint, confirmed by Shen Changtian's arrival report and visible in the way Jin Tonghua moved: the specific efficiency of a practitioner who had been at one level long enough to stop thinking about it.
He looked like someone who had been carrying something heavy for a long time and had grown used to the weight.
Shen Changtian received him at the outer gate. Brief administrative exchange. He was brought to the main hall's formal consultation room.
Shen Moran had the full documentation setup running. Jin Tonghua looked at it. He said: "Central authority relay active."
"Yes," she said. "As specified in the reply relay. All consultations are conducted on documentation record."
He sat. He put a folder of formation records on the table.
"I've been inside the Wuyuan Sacred Ground's institutional structure for sixty years," he said. "I was assigned to the archive access administration forty years ago, which gave me access to the restricted records. I began reading the restricted archive fifteen years ago when I found a reference in the general collection that pointed to a sealed section I hadn't known existed." He paused. "What I found in the sealed section is why I am here."
The household was arranged around the consultation table: Wen Zhao, Shen Moran, Xu Lianhua. He had asked that Xu Lianhua be present specifically. Luo Tianxin was in the adjacent documentation room — technically not present, but present enough that her notation would cover everything.
---
The restricted archive had been built by the Wuyuan Sacred Ground's founding patriarch.
Jin Tonghua laid this out carefully, the way a practitioner who has lived with information for fifteen years lays it out when they finally have the right audience: organized, precise, with the specific weight that comes from having tested every implication.
The Sacred Ground had been founded three hundred and fifty years ago. The founding patriarch — a practitioner whose name appeared in no other major historical record, which Jin Tonghua had found suspicious from the first — had established the institution with an explicit founding charter that included, in its sealed second chapter, a specific purpose that had been kept from every subsequent leadership generation.
The Wuyuan Sacred Ground had been founded to monitor the distributed anchor structure in the Upper Heaven Mountains.
Not protect it. Not maintain it. Monitor it. Measure the qi-leakage rate of the seal's degradation over time and maintain the measurement record so that when the degradation reached a critical threshold, the information would be available.
"The founding patriarch knew about the anchor structure," Jin Tonghua said. "The restricted archive contains his direct account of how he learned about it — a practitioner he encountered in the Upper Heaven Mountains during his early training, who had been studying the valley's formation architecture without understanding what they were looking at. The founding patriarch understood enough to recognize the significance. He built the Sacred Ground's measurement apparatus into the institution's foundation work." He paused. "The Sacred Ground's location in the East Wilds was chosen specifically because it's the optimal position for the formation instruments to read the seal's degradation output."
Xu Lianhua was looking at the formation records in the folder.
She said: "These are the measurement records."
"Three hundred years of them," Jin Tonghua said. "Annual measurements. Consistent methodology. The founding patriarch designed the instruments carefully — they'd have been useless if the methodology drifted."
She read the records. She did not speak while she read.
Jin Tonghua let her read.
After fifteen minutes, she set the records down.
She said: "The degradation rate is not linear."
"No," he said. "It wasn't linear even in the earliest records. The founding patriarch noted this. The degradation rate has been accelerating." He paused. "In the first century, the annual leakage rate was approximately one-half of one percent of the seal's remaining capacity. By the second century, that rate had approximately doubled. In the third century—"
"It doubled again," Xu Lianhua said. She was looking at the records. Her voice was even, the evenness of someone processing information that is significantly worse than what they had.
"Yes," he said.
Wen Zhao said: "What does the current rate calculate to."
Jin Tonghua looked at the table. He said: "The most recent Sacred Ground measurement is from three months ago, before the engagement engagement record was filed. At the current acceleration curve, the seal's remaining capacity is—" He paused. "Not three years. Closer to eighteen months."
The consultation room was quiet.
Shen Moran was writing. Her notation was steady. Hands doing something useful rather than sitting still.
"Eighteen months," Wen Zhao said.
"Between sixteen and twenty months at ninety percent confidence," Jin Tonghua said. "The acceleration curve has some variance. But the central estimate is eighteen months." He paused. "I've been sitting on this for three months. I filed the engagement record acknowledgment and the consultation request the same day I saw that the Azure Void Sect's Patriarch was accessing the pillar's inner layer. The access changed the degradation readout — the rate slowed slightly when the first node opened. I thought you needed to know both pieces together."
---
Xu Lianhua ran her own calculations against Jin Tonghua's records for the rest of the morning.
The household had been organized, before this consultation, around the assumption that the timeline was three years. Not comfortable exactly — the seal's degradation was not a comfortable fact under any timeline — but three years was enough time to work methodically, to process the remaining four sealed impressions in sequence, to find the four missing physiques the system had not yet identified, to develop the active applications that Xu Meilin's breakthrough suggested were possible.
Eighteen months was not three years.
Eighteen months was long enough to do things. But it was not long enough to do them at the current pace.
Xu Lianhua delivered her reconciliation at the afternoon session: Jin Tonghua's accelerating-curve model against her own formation analysis of the anchor's current state. The degradation rate she'd been measuring since arriving at the sect was consistent with Jin Tonghua's records. She had interpreted it as linear. The Sacred Ground's three-hundred-year baseline showed it was not.
Her revised estimate: seventeen to twenty-one months. Most likely range, eighteen to nineteen.
"The physical node openings are producing the rate slowdowns Jin Tonghua observed," she said. "Each node opening reduces the degradation rate slightly. The fourth node, when opened, will slow it further." She paused. "I've been modeling what happens if all six nodes open before the seal's capacity runs out. If the full correspondence is received and the anchor's architecture is optimally maintained—" She looked at the map. "The timeline extends. Potentially by six to eight months. We need the nodes. We need them in sequence. We need them quickly."
Zhan Wudi said: "How quickly."
"The nodes open on their own schedule," Xu Lianhua said. "I cannot accelerate the process. The first node requires the second's processing to be complete before the third loosens, and so on. I've been monitoring the architecture for three weeks. The process is not arbitrary — it's calibrated to the time required for each impression's content to be fully integrated."
"What controls the integration time," Bei Yufeng said.
"The practitioner at the central node," Xu Lianhua said. She looked at Wen Zhao. "You."
He had been sitting through the entire session with his hands flat on the table and the expression he wore when he was processing information from multiple angles and had not finished. He said: "How much does active engagement change the integration time."
"Unknown," she said. "You've been processing each impression as it arrives. If deliberate engagement reduces the integration period — and there's theoretical basis in Wei Shaoran's architectural choices to suggest it might — then active work with the impressions' content could speed the schedule."
"What does active work look like," he said.
"Using the impressions' information rather than holding it," she said. "The second impression told you the anchor structure is a demonstration. You've been working with that understanding — you've applied it to how you respond to the relay inquiries, how you've been thinking about what the sect is. The processing accelerates when the content becomes active rather than stored."
He looked at the map.
He said: "Tell Jin Tonghua his information is accepted and the accuracy of the measurement record is not in doubt." He paused. "Ask him if he's staying."
---
Jin Tonghua was staying.
He'd said this in the consultation — he had requested to remain at Azure Void Sect not as an affiliate representative, not as an institutional observer. He'd left the Sacred Ground two weeks before the advance relay, with the archived records and a private communication to three colleagues he trusted, telling them where he'd gone and why. His position in the Sacred Ground's administrative structure was officially vacant. He did not anticipate reclaiming it.
He was four hundred and thirty years old, Upper Saint cultivation, sixty years of institutional service and fifteen years of sitting on information that needed to be at the right table. He had brought the records to the right table.
Shen Changtian assigned him a residence room in the east wing with the matter-of-fact efficiency of someone who had assigned residence rooms to unexpected long-term guests before.
Jin Tonghua stood in the doorway of the residence room and looked at the south anchor in the cultivation pond, visible from the east wing's window.
He said, to Shen Changtian: "Three hundred years of measurements. Three centuries of patriarchs who didn't know what their institution was actually for." He paused. "I don't know if the founding patriarch expected that. He built it for this moment — built the measurement record so the information would exist when it was needed. He couldn't have expected what the institution would become around the purpose he'd built it for."
Shen Changtian said: "Most things become something other than what they were built for." He paused. "The Patriarch spent fifteen years as the worst cultivator on the continent. He's done reasonably well with different circumstances." He handed Jin Tonghua the residence key. "Breakfast is at the fifth hour. Xu Lianhua will want to run the formation instruments against your archive records in the morning."
Jin Tonghua looked at him.
"She said so before you arrived," Shen Changtian said. "She's been thinking about the measurement methodology for two days."
---
Wen Zhao was at the primary pillar when the fourth node's seal released.
He had not intended to open it that evening. The seal had been loosening, and then Jin Tonghua's information had arrived and the household had spent the afternoon working through the recalibrated timeline, and at some point in the evening the fourth node had loosened past the threshold and done the releasing on its own.
He stood at the pillar in the formation workshop and felt the fourth impression arrive.
It was different from the third. The third had been personal in the way of a practitioner writing something uncomfortable. The fourth was structural — Wei Shaoran back in architect mode, specific and technical. But the specificity of the fourth impression was different from the first two's structural explanations.
The fourth impression was about the anchor's single point of failure.
He stood there for a long time.
Then he went to find Xu Meilin.
She was at the cultivation pond's stone step. She looked up when he came.
He said: "The fourth node opened."
She looked at him. She said: "What does it say."
He sat on the step beside her.
He said: "One corrupted physique breaks the demonstration entirely. Shadow corruption in any of the ten active physiques doesn't weaken the seal. It inverts it. The anchor requires what the physiques are — if one of them demonstrates something that the First Dark *can* corrupt, the seal's proof fails."
She was very still.
He said: "The impression mentions the specific physiques that the shadow corruption is most likely to target. Not all of them are equivalent risks. The jade bone is not on the list."
She said: "I know why."
"Yes," he said.
They looked at the cultivation pond.
She said: "Who is."
He said: "We should tell the household together."
She stood up. He stood up. They went inside.
The fourth impression was still distributing through his cultivation memory, patient and precise. Seventeen months. Possibly. If the fourth node's rate-slowdown held, if the fifth and sixth followed, if nothing in the list of vulnerable physiques was reached before the anchor could be completed.
A lot of conditionals.
He thought: this is the part of the lesson where the exam date moves up and you realize you should have been studying harder since the beginning.
He went to call the household together.
