Chapter 419: The Brain

The first thing Elden asked for was the failure report.

Not the ancient network’s map. Not the energy readings from the approaching signal. Not even the records of the construct that had awakened beneath District Seven.

He wanted to know exactly what had stopped working when the connection failed.

Lily stared at the report displayed between them.

"You’ve been connected to Nexus for six minutes, and that’s your first question?"

"It’s the most important one."

"The ancient network has connections spanning the planet. We have a defense system that woke up after centuries of inactivity, and something unknown is approaching our world."

"And if I don’t understand what failed yesterday, I won’t know how to prevent it from failing again tomorrow."

Elden enlarged the report.

"Now, show me which systems lost communication when the ancient connection was interrupted."

Lily sighed, but began organizing the data.

They were working inside a secured technical chamber near the central network. Elden appeared on a large screen, while his diagnostic interface received carefully limited information through Mythal’s infrastructure. He could observe Nexus’s systems, but he had no authority to issue commands to its defenses.

Kai had insisted on that restriction.

After the incident beneath District Seven, nobody was willing to risk another uncontrolled activation.

Sera stood beside Kai, watching the diagrams develop. Aren had joined them to provide information about the ancient passages, while Gabriel coordinated the Church’s technical archives.

Elden studied the incoming reports.

"Communications failed first. Then the Hunter Association lost access to part of its defensive coordination system. Finally, the emergency administration reported a delay in its district monitoring."

"Three different systems," Sera observed.

"Three different systems that may depend on the same connection," Elden replied.

Lily brought up the ancient network’s integration layout.

"That’s what we’re here to determine. Nexus’s engineers connected the modern systems to the ancient network because it offered faster communication and better coverage. They didn’t have enough information to understand every connection beneath it."

"Which means the integration was built around what they could observe," Elden said. "Not necessarily how the entire system functions."

He examined the layout for another moment.

Then he leaned closer to the screen.

"Who approved this arrangement?"

Lily raised an eyebrow.

"Why?"

"Because I want to know whether someone deliberately connected three critical functions to the same ancient channel, or whether the dependency was hidden."

"It was hidden. The original connections appeared independent until the network synchronized."

Elden nodded slowly.

"Then we aren’t looking at a simple engineering mistake. We’re looking at a dependency nobody knew existed."

That distinction changed the investigation.

They weren’t merely repairing a damaged connection. They needed to understand how the ancient network could affect modern infrastructure before another activation caused a wider failure.

...

Elden spent the next several minutes separating the city’s systems into functional groups.

Power distribution. Communications. Defensive coordination. Emergency monitoring.

He marked each system according to its current connection, its backup options, and the consequences of losing access to the ancient network.

Lily watched as the diagram became increasingly complicated.

Then she frowned.

"Your system is ugly."

Elden didn’t look up.

"It’s functional."

"Barely."

"You’ve known it for twelve minutes."

"Twelve very informative minutes."

Aren chuckled.

Sera glanced at the diagram.

"I’m not sure I want to know what it looked like before Lily started criticizing it."

"Worse," Lily answered immediately. "Some of the connections are labeled incorrectly, and the interface treats several ancient routes as if they’re ordinary power conduits."

Elden finally looked at her.

"They were connected to modern infrastructure before we had the information needed to classify them properly. The labels reflect their observed behavior, not their original purpose."

"Then the labels are misleading."

"Which is why we’re changing them."

Lily seemed satisfied with that answer.

She pointed toward a group of lines branching from the central network.

"These aren’t independent routes. They’re different outputs from the same ancient channel. The network makes them look separate because each output serves a different function, but they’re all dependent on the same underlying connection."

Elden enlarged the diagram.

There it was.

The communication system, part of the defensive coordination network, and a section of the emergency monitoring system all depended on one ancient connection.

If that connection failed, all three could fail together.

"That’s the problem," Elden said. "The system has several outputs, but only one reliable source."

Gabriel looked at the diagram with growing concern.

"So a failure in one ancient connection could disrupt several modern services at once."

"Correct. And the problem isn’t limited to communications. If the same pattern exists elsewhere, we may have other hidden dependencies."

Kai folded his arms.

"Can we separate them?"

"Some of them. We can create independent backup routes using modern infrastructure, but we cannot duplicate every function of the ancient network."

Elden highlighted the affected systems.

"We need to separate the critical functions wherever possible, add redundant connections, and establish safe fallback procedures. If the ancient network becomes unavailable, the city must still be able to communicate and coordinate its defenses."

Lily studied the ancient connections.

"I can identify which outputs can be redirected without interfering with the original system. But some routes are more complicated than they look. If we alter the wrong connection, we could trigger another defensive response."

"Then we don’t alter those routes until we understand them," Elden replied. "We build redundancy around them instead."

For the first time, Lily smiled.

"That’s actually a reasonable answer."

"Try not to sound so surprised."

...

They began with the communications network.

Elden designed an isolated backup route using Nexus’s existing infrastructure, with Mythal’s diagnostic interface monitoring the ancient connection without controlling it.

Lily identified a secondary ancient output that could safely carry limited observation data. Aren verified that the proposed route corresponded to the physical passages they had explored, while Nexus’s engineers checked the modern connections.

The work was slow.

Every proposed change had to be checked against the ancient network’s behavior. A route that appeared safe on the map could still depend on a hidden mechanism deeper beneath the city.

At one point, Lily rejected Elden’s first proposed connection.

"That route won’t work."

Elden examined her markings.

"Explain."

"The output carries more than communication data. It also transmits status information to the central network. If we redirect it without separating those functions, we could send incomplete information back to the system."

"Can you separate the outputs?"

"Not with the interface we currently have. The ancient structure handles both functions internally, and we don’t understand how."

Elden removed the proposed connection from his diagram.

"Then we leave that section untouched and build a modern backup around it."

Lily looked at him.

"You’re not going to argue?"

"I asked you to identify the ancient system’s limitations. You found one. Ignoring it because I dislike the answer would defeat the purpose."

Her expression softened.

"Good. Because I was about to explain it again."

"I’m sure you were."

They continued working.

By the time the first arrangement was ready, Elden had established a separate communications route, added backup power to the diagnostic interface, and created a system that could isolate the ancient connection without shutting down the city’s essential services.

It was not a complete solution.

But it was ready to be tested.

...

Kai authorized the controlled test after the Nexus engineers confirmed that the backup route was isolated from the defensive systems.

The test would temporarily disconnect the ancient channel supplying the three dependent functions. No civilians would be placed at risk, and the affected services had been moved to a controlled environment where their responses could be measured.

Elden reviewed the final configuration.

"Once the connection is interrupted, the original arrangement should lose all three functions. We need to confirm the extent of the failure before activating the backup."

Lily stood beside the interface.

"And if the ancient network responds unexpectedly?"

"We restore the original connection if it is safe to do so. Otherwise, we isolate the affected system and use the modern fallback."

Sera looked toward Kai.

"I’m beginning to understand why Elden wanted the failure report first."

Kai nodded.

"He needed to know what the system did when it lost its support. Otherwise, he would be designing a backup without knowing what it had to preserve."

Elden gave the final authorization.

"Proceed."

The ancient channel disconnected.

The result was immediate.

The communications display went dark. The defensive coordination system stopped receiving updates, and the emergency monitoring interface lost contact with several simulated districts.

Warnings filled the screen.

ANCIENT CONNECTION UNAVAILABLE

COMMUNICATIONS STATUS: FAILED

DEFENSIVE COORDINATION: INTERRUPTED

EMERGENCY MONITORING: DEGRADED

Lily watched the results.

"That’s consistent with the original failure. All three systems are affected."

"Activate the revised arrangement," Elden ordered.

The engineers switched to the backup configuration.

For a moment, nothing happened.

Then a separate communications channel came online.

The emergency monitoring system began receiving data again. The defensive coordination display restored its connection to the test units, and the operations center regained control of the simulated districts.

BACKUP ROUTE: ACTIVE

COMMUNICATIONS STATUS: RESTORED

DEFENSIVE COORDINATION: RESTORED

EMERGENCY MONITORING: PARTIAL

Lily leaned forward.

"Partial?"

Elden examined the remaining warning.

"The backup restores the critical functions, but it doesn’t reproduce every capability of the ancient network. Some monitoring data still depends on the original connection."

"Can we fix that?"

"Not yet. We don’t know how the ancient system generates that information, and modern equipment cannot reproduce it."

Kai studied the results.

"But the city can still communicate, coordinate its defenses, and respond to an emergency if the ancient channel fails."

"Yes," Elden replied. "Those are the functions we cannot afford to lose."

The improvement was real.

Under the original arrangement, a single connection failure had disabled several critical systems together. Under Elden’s revised design, the backup route kept the most important functions online.

He had not made the ancient network safer by pretending to understand it.

He had made Nexus safer by ensuring that the city would not collapse if part of it failed.

Gabriel let out a quiet breath.

"That changes how we should approach the other connections. We don’t need to understand every ancient function before improving our defenses. We need to identify what cannot be allowed to fail, then protect those functions while the research continues."

"Exactly," Elden said. "We can improve the city’s resilience now without claiming that we’ve solved the entire network."

Lily glanced at the revised diagram.

"Your system is still ugly."

Elden sighed.

"And your timing is still terrible."

"But it works."

"This part works."

Lily grinned.

For the first time that day, even Kai allowed himself a small smile.

...

Elden recorded the results and began marking the remaining vulnerabilities.

Several ancient connections could not be duplicated using modern technology. Others carried information that the current interface could not safely separate. He classified them as priority risks and assigned each one a separate investigation.

Then he reached a section of the network that had appeared repeatedly in the latest reports.

He stopped typing.

"There’s one connection we haven’t addressed."

Lily moved closer.

"Which one?"

Elden highlighted a route branching away from the central control structure. Unlike the connections they had just repaired, this one did not lead toward the city’s power distribution or defensive coordination systems.

It led toward a section of the ancient network associated with outbound signal routing.

Kai immediately recognized the significance.

"The same system involved in transmitting information beyond the planet?"

"Possibly. The network’s records identify the function, but we haven’t confirmed what it transmits or whether the current signal uses it."

Lily examined the route.

"This connection cannot be duplicated with modern equipment. We don’t have the underlying mechanism, and the ancient network doesn’t provide enough information for a safe reconstruction."

"Can we isolate it?" Kai asked.

"Not without risking a disruption to the central network. We can monitor it, but I wouldn’t recommend disconnecting it until we understand its role."

Elden marked the connection as a priority risk.

"The improvements we’ve made will protect several critical systems if their shared connection fails. But this section remains vulnerable, and it may be directly relevant to the signal approaching our world."

Sera looked toward the central display.

"So we’ve improved the city’s defenses, but we still don’t know whether the system we’re protecting is involved in what’s coming."

"Correct," Kai said.

Elden sent the revised diagrams to Nexus’s engineering team and Mythal’s infrastructure department.

The Brain had given the alliance its first major technical victory. Nexus could now maintain essential communications and defensive coordination even if one ancient connection failed.

But the test had also exposed the limit of their progress.

Some ancient systems could be protected without being understood.

Others were so deeply integrated that changing them could create a greater danger than leaving them alone.

And one of those connections led directly toward the network’s outbound signal system.

Whatever was approaching the planet, the alliance had just discovered that the infrastructure they were preparing to defend might be connected to it in ways they still could not explain.