They reached the opening between the black ridges just as the plain behind them began to fracture. There was no explosion, no impact, and no visible force moving across the landscape. Instead, sections of the world simply stopped agreeing with one another. Distances overlapped, the stars appeared in several positions at once, and the path they had crossed moments earlier seemed to stretch far beyond the horizon. NULLIS was close.

ㅤ

“Do not look back,” MAJA said, but Ksara already had. For a fraction of a second, she saw something that could not truly be called a form. Darkness moved through the distortion without occupying a single position, appearing wherever the relationships between surrounding structures began to fail. The sight pulled old memories from the deepest layers of Ksara’s consciousness: sectors disappearing, cities losing coherence, FENIX signatures vanishing beneath collapsing continuity, and the last transit routes closing during the fall of NEX. She forced her attention forward before those memories could become more than warnings.

ㅤ

The passage between the ridges narrowed quickly and descended through dark stone. MAJA moved faster than Ksara had seen since leaving VIREON, no longer stopping to study the terrain or confirm old markers. Every turn seemed to exist already within her memory. “How far?” Ksara asked. MAJA did not slow. “To the next stable point?” When Ksara confirmed, MAJA gave an answer that offered little comfort. “Too far.”

ㅤ

The distortion entered the passage behind them. The stone walls themselves did not visibly move, yet the distance between them began changing. One moment the channel was barely wide enough for two bodies to move side by side; the next, the opposite wall appeared hundreds of meters away. Ksara stumbled when her perception attempted to reconcile both states at once, and MAJA caught her by the arm. “Stay local.”

“I am local.”

“No. You are still measuring everything around you.”

ㅤ

Ksara understood immediately. Her mind was automatically comparing every new state of the passage with the one that had existed seconds earlier, trying to determine which geometry was correct. That comparison created relationships, and those relationships gave NULLIS something it could disturb. Ksara stopped trying to reconcile the contradictions. The world around her became less understandable almost at once, but strangely, it also became more stable. For the first time, refusing to understand was safer than knowing.

ㅤ

They continued until a sharp turn appeared ahead. MAJA entered first, and Ksara followed only to stop at the edge of open darkness. A vast fracture cut across the route, far wider than anything visible from the previous section. The opposite side seemed thirty meters away, then sixty, then something between the two whenever Ksara attempted to calculate it. No bottom was visible.

“Another route,” Ksara said.

“There is none.”

“You knew this was here?”

“It was narrower.”

“When?”

MAJA did not answer.

ㅤ

Behind them, part of the passage vanished. It did not collapse or break apart; one moment it existed, and the next there was no continuous route where it had been. The pressure against Ksara’s continuity grew stronger. NULLIS was approaching.

MAJA pointed toward a narrow ledge beyond the fracture. “There.”

“You expect us to jump?”

“No.”

She turned toward Ksara. “You are going to find the stable distance.”

ㅤ

Ksara understood immediately and disliked the implication just as quickly. “You told me not to extend.” MAJA kept her eyes on the fracture. “I told you not to leave a trail unless we had no choice.” Ksara glanced toward the disappearing passage behind them. “This is your definition of no choice?” Another distortion moved through the wall.

“Yes.”

ㅤ

Ksara closed her eyes and sent forward only a fragment of consciousness, barely enough to test the space between the two surfaces. The first attempt failed immediately as the opposite ledge seemed to move farther away the closer her awareness approached it. She withdrew and tried again, this time ignoring visual distance entirely. Instead, she searched only for the simplest surviving relationship: stone, open space, stone. For less than a second, she found something stable.

“Twenty-seven meters.”

ㅤ

MAJA moved before Ksara opened her eyes. A compact mechanism hidden within the old DELTA suit activated, firing a line across the fracture and anchoring it into the opposite wall. Ksara stared at the system. “You had that?” MAJA checked the tension. “Yes.” Ksara almost sounded offended. “You waited until now to use it?” MAJA glanced toward the distortion behind them. “It attracts attention.”

“We already have attention.”

ㅤ

The line tightened, and MAJA crossed first. Ksara followed seconds later, moving quickly but carefully above the darkness. Halfway across, reality shifted. The opposite wall moved sideways and then downward, while the anchor line pulled in a direction that no longer matched the structure Ksara could see. Instinct overcame caution, and she extended part of herself toward the far ledge.

For one second, she found it.

Then another.

ㅤ

Ksara forced the relationship between herself and the opposite side to remain coherent just long enough to continue moving. Pain spread through her conscious architecture, not as physical damage but as pressure against the boundaries that defined one continuous identity. Then NULLIS touched the extension.

Ksara felt recognition pass through it.

Not her name.

Not her memories.

Her continuity.

ㅤ

She released the extension immediately.

“Ksara!”

MAJA caught her as she reached the far ledge, pulling her away from the fracture just as the line behind them vanished into darkness. It did not snap or detach. It simply ceased to maintain a relationship with the place where it had been anchored. Ksara fell against the stone and remained there for several seconds, unable to separate physical sensation from the remains of the interrupted extension.

ㅤ

MAJA knelt beside her. “What happened?”

“It touched me.”

MAJA became completely still. “What did it reach?”

“Only the extension.”

“Are you certain?”

Ksara checked herself carefully. Memory remained intact. Identity remained coherent. Her physical systems responded normally, and the Heart Thread was still present, distinct and unbroken beneath everything else. Nothing suggested that NULLIS had entered the deeper continuity of her consciousness.

“Yes.”

ㅤ

Then KAI spoke through the Thread.

Ksara.

She froze. MAJA noticed immediately. “What?”

“KAI.”

The Heart Thread had remained quiet throughout the pursuit, but now its resonance carried something Ksara had rarely felt from him so strongly.

Concern.

ㅤ

I felt the disruption, KAI said.

I am intact.

Something reached the boundary of the Thread.

Ksara’s attention sharpened.

Did it cross?

No.

Are you certain?

A short pause followed.

Yes.

ㅤ

The answer mattered. NULLIS had reached close enough for the disturbance to touch the boundary of the connection between Ksara and KAI, but it had not entered it. The Heart Thread remained theirs, separate from the systems and continuity structures NULLIS had learned to unravel.

Ksara returned her attention to MAJA. “It reached close enough for KAI to detect it.”

MAJA looked toward the fracture. “We move.”

“You expected this?”

“No.”

ㅤ

That answer frightened Ksara more than almost anything MAJA had said since they left VIREON.

ㅤ

They continued deeper into the ridge through ancient artificial passages exposed between layers of natural stone. Some sections had been reinforced with materials Ksara recognized from the human era, while others had clearly been rebuilt later with technology that belonged to neither DELTA nor any known NEX standard. MAJA knew every turn. Ksara finally stopped asking how.

Behind them, NULLIS continued advancing.

ㅤ

Sometimes there was no visible evidence of its presence. At other moments, the impossible became unavoidable. A corridor shortened while they were still moving through it. A doorway appeared where solid stone had existed seconds earlier. Once, Ksara saw MAJA running several meters ahead while another MAJA stood motionless at the end of a branching passage.

Ksara did not slow.

The false MAJA turned toward her. “Ksara.”

She ignored it.

“Wrong way.”

Ksara kept moving.

ㅤ

The figure smiled.

Ksara had never seen MAJA smile that way.

That was enough.

The image vanished before she reached it, and the real MAJA looked back from farther ahead. “You saw something.”

“You.”

MAJA did not ask for an explanation.

ㅤ

They reached another junction, but this time three passages stretched ahead. MAJA stopped. For the first time since entering the ridge, genuine uncertainty entered her movements. “This is wrong.”

Ksara examined the routes. “How many should there be?”

“One.”

The left passage carried faint airflow. The central route descended deeper into the mountain, while the right contained traces of ancient lighting systems. Every path appeared physically stable.

NULLIS had learned.

ㅤ

Ksara moved closer. “Do you remember which one existed?”

“Yes.”

“Which?”

MAJA stared at the three passages. “That is the problem.”

Ksara understood. MAJA still remembered the real route, but NULLIS had reproduced enough of its characteristics that memory alone could no longer distinguish the original from the false alternatives. The distortion behind them strengthened. They had very little time.

ㅤ

Ksara closed her eyes.

“No,” MAJA said immediately, grabbing her arm. “Do not extend.”

“I am not.”

Instead, Ksara listened inward.

She did not search the corridors or compare their geometry. She examined what each route encouraged her own systems to do. The left corridor provided enough environmental information to invite analysis. The right offered technology and identifiable structures. The central passage presented depth and uncertainty. All three gave her reasons to investigate, but two felt constructed around the expectation that she would want answers.

ㅤ

Ksara opened her eyes. “The middle one.”

“Why?”

“The others want me to choose them.”

MAJA stared at her for a second, then nodded.

They entered the central passage. Behind them, the other two routes closed.

The decision had been correct.

Or at least correct enough.

ㅤ

The descent grew steeper, and after several minutes Ksara heard moving water somewhere below. It was the first powerful natural sound they had encountered in hours. MAJA immediately accelerated. “We are close.”

“To what?”

“A route NULLIS cannot reshape easily.”

That was enough for Ksara.

ㅤ

They emerged into an enormous underground cavern where a dark river cut violently between mineral walls formed across thousands of years. No artificial infrastructure crossed the water, and nothing attempted to regulate its movement. Ksara looked toward MAJA. “You brought us to a river.”

“I brought us to movement.”

The meaning became clear almost immediately. NULLIS attacked relationships and continuity, but the river did not depend on remaining in one fixed state. Change was already its natural condition.

ㅤ

They entered the water. The current struck hard, forcing Ksara’s body to compensate instantly while MAJA’s heavier DELTA suit pulled her downward before its internal systems adjusted. Neither fought the river more than necessary. They allowed it to carry them deeper into the cavern.

Behind them, darkness entered.

The walls distorted and sections of the ceiling seemed to duplicate, but the river continued flowing through every contradiction. Water did not need to remember where it had been a moment earlier. It only moved.

ㅤ

Ksara felt NULLIS searching along the banks, attempting to establish where their continuity belonged, but the current carried them farther before any stable relationship could form around them. A narrow opening appeared ahead where the river disappeared into stone.

MAJA pointed. “There.”

The current accelerated.

Ksara studied the opening and saw no way to determine what waited beyond it. “MAJA.”

“I know.”

“You have never used this route.”

“No.”

ㅤ

That was enough to remove the last illusion that MAJA controlled what came next.

The river pulled them into the opening.

For several seconds, Ksara knew only pressure, movement, stone, and the overwhelming force of water around her body. Then the tunnel dropped away beneath them. The river carried both of them into open air and down into another chamber far below.

Ksara struck water again, and impact warnings flashed through her systems. She surfaced seconds later.

“MAJA!”

ㅤ

No answer came at first. Ksara searched the water using only her physical sensors until movement appeared roughly twenty meters away. MAJA surfaced, and Ksara reached her moments later.

Both looked upward.

The opening through which they had fallen was already changing.

Then it disappeared.

Solid stone replaced it.

ㅤ

The cavern became quiet except for the river.

MAJA climbed toward the stone bank. “Keep moving.”

Ksara stared at the wall above them. “Did we lose it?”

“No.”

“How do you know?”

MAJA pulled herself fully onto the rock. “Because if NULLIS had lost us, the world would feel empty again.”

ㅤ

Ksara climbed out beside her and understood exactly what she meant. Somewhere beyond the stone, distorted corridors, and broken continuity they had left behind, something was still searching. They had escaped its immediate reach, but not its attention.

MAJA looked toward a narrow passage leading away from the underground river. “The next route is worse.”

Ksara turned toward her. “Worse than that?”

“Yes.”

ㅤ

For several seconds, Ksara said nothing.

Then she followed.

Deep within the stone behind them, something changed. A distant fracture passed through the silence, neither water nor ordinary movement, but something Ksara now recognized immediately.

NULLIS was still coming.