212 - The Deep Veins

By the following morning, Ironvein's engineers had sealed the eastern maintenance entrance. Subin's team received permission to use a separate mining passage on the northern side of the ridge, where the old survey ended at a natural cavern. Kellan would accompany them as far as the last marked chamber, while Ironvein's guards remained behind to secure the settlement.

Before leaving, Subin collected the dark metal strip he had selected the previous evening. Ara had discovered that it resisted mana interference better than ordinary iron, though its precise properties would require further testing. He stored it with his equipment and followed Kellan into the northern passage.

The route descended through abandoned extraction chambers, passing rusted rails and machines too damaged to operate. They encountered no monsters, but the marks of recent burrowing appeared several times along the walls. At the final surveyed chamber, Kellan pointed toward a narrow opening beneath a fallen support beam.

"That's where the miners stopped working. The passage beyond wasn't part of our original excavation."

Subin examined the opening. The rock had been broken from the other side, leaving a jagged tunnel just wide enough for a person to pass through.

"Stay here and mark the entrance," he told Kellan. "We'll return if the passage becomes unsafe."

Kellan nodded, visibly relieved not to be expected to enter an unexplored tunnel.

Subin, Yerin, Jae-hyun, Liu Wei, Rafael, and Ara continued inside.

The passage opened into a cavern filled with towering mineral veins. Unlike the deposits beneath Ironvein, these formations extended from floor to ceiling, creating walls of dark crystal streaked with blue and silver. The ground was firm, but the air carried a faint vibration that Subin could feel through his boots.

Ara checked her scanner. "The concentration is higher than anything we've measured so far. It's not just one deposit. The entire cavern is saturated."

"Will that affect us?" Rafael asked.

"Not directly. But equipment may behave unpredictably near the strongest formations."

Jae-hyun glanced at his weapon. "Then I'll try not to depend on anything complicated."

"You already don't," Liu Wei said.

They continued along a natural ledge above a deep fissure. Far below, faint blue light moved between the rocks. At first, Subin assumed it was a reflection, but the glow traveled against the direction of the surrounding mana currents.

He stopped.

"Something is moving down there."

The others gathered near the ledge without approaching its edge. A long shape crossed the fissure, briefly exposing a plated back and several pale limbs before vanishing beneath a crystal shelf.

Ara's scanner struggled to produce a stable reading.

"Large creature. I can't determine its level through all this interference."

"Can it reach us?" Yerin asked.

"Not without climbing or finding another passage."

Subin watched the place where the creature had disappeared. It had not approached them, and the ledge offered no safe way to descend. He marked the location and continued forward rather than risking a confrontation without knowing the terrain.

The cavern narrowed into a passage lined with broken mining equipment. Several carts lay overturned beside the wall, their contents scattered across the floor. Near one cart, Subin found a metal badge bearing Ironvein's crossed hammer and pick.

Ara picked it up carefully.

"This belonged to a mining crew."

"How old?" Yerin asked.

"The badge is damaged, but not heavily corroded. It could have been lost during the recent disturbances."

Subin searched the surrounding area. There were no bodies, and the tracks leading away from the cart were difficult to distinguish from the marks left by the creatures moving through the cavern. He handed the badge to Ara for recording and continued toward a faint sound coming from farther ahead.

It was not the grinding of stone or the movement of a monster. It was a repeated metallic strike.

Someone was working.

The passage emerged into a broad chamber where a series of platforms had been built around a massive mineral pillar. At the far end, a small figure stood beside a damaged mechanism, striking its casing with a short hammer. The figure wore a patched mining suit and carried a lantern fixed to the shoulder.

When the newcomer noticed the expedition, the hammer fell from their hand.

"Don't come any closer!"

Subin stopped immediately. "We're from Ironvein. We found your badge on the way here. Are you one of the missing miners?"

The figure stared at him for several seconds before lowering the lantern.

"My name is Tessa. I was part of the northern survey crew."

Ara exchanged a surprised glance with Yerin. Ironvein had recovered two bodies, but the remaining miners had never been found.

"How long have you been here?" Rafael asked.

Tessa looked exhausted. "I stopped counting after the third day."

Subin moved closer, keeping his hands visible. Tessa's suit was torn, and one leg was wrapped in a makeshift bandage. A small supply pack rested beside the damaged mechanism, nearly empty.

"What happened to the others?" he asked.

"We were surveying the lower mineral veins when the tunnel collapsed. Something came through the wall. The others ran toward the upper passage, but I was trapped here when the support mechanism failed."

"Did you see the creature?"

Tessa nodded. "A huge thing with crystals growing out of its back. It broke through the wall and went deeper into the cavern. I haven't seen it since."

Subin recognized the description of the Riftstone Burrower, though the creature below the ledge had appeared larger and more heavily armored than the ones near Ironvein.

Tessa pointed toward the mechanism. "I've been trying to reopen the maintenance lift. It connects to the old mining route, but the power flow keeps failing. If I can restore it, we might reach the upper chambers."

Ara examined the mechanism. Its frame had twisted under pressure, but the main components remained intact. With Tessa explaining the original arrangement, she was able to identify the damaged coupling and isolate the faulty connection.

"Give me a few minutes," Ara said.

While she worked, Rafael treated Tessa's injured leg, and Yerin distributed food and water. Jae-hyun searched the chamber for additional supplies, finding a small cache of mining tools and a sealed container of emergency rations.

Subin approached the edge of the platform and looked down at the mineral pillar. Thin lines of blue light ran through its surface, converging near the base. The strange glow he had seen in the fissure appeared again, moving between the crystals before disappearing into a lower tunnel.

He could not identify the source, but the pattern suggested that the mineral formations were connected through the rock rather than existing as isolated deposits.

"Anything useful?" Liu Wei asked.

"Not yet."

"That's usually how your discoveries begin."

Subin gave him a brief smile.

A sudden tremor interrupted them. Dust fell from the ceiling, and a deep impact sounded somewhere below the platform. Tessa went pale.

"It's back."

Ara finished securing the damaged coupling and stepped away from the mechanism. "The lift is working, but it needs a stable power source. We can use it to reach the upper route once the system finishes charging."

The tremor came again, closer this time.

A section of the mineral pillar cracked, scattering fragments across the platform. Something forced its way through the lower wall, revealing a massive creature with overlapping black plates and a crown of crystalline growths along its spine. Its forelimbs were thick enough to shatter stone, and its head was protected by a wedge-shaped shield of dark armor.

Ara's scanner finally produced a reading.

Riftstone Burrower — Level 251 — A-rank.

It was considerably stronger than the two creatures they had encountered near Ironvein.

The Burrower dragged itself onto the platform, drawn toward the exposed mineral pillar. Tessa backed away from the damaged mechanism, while the others spread out to avoid being trapped against the wall.

Subin moved to intercept the creature before it could reach Ara and the lift.

His opening strike landed against a crystalline plate, but the blade failed to penetrate deeply. The Burrower's armor was denser than that of the earlier specimens, and the energy running through its back reinforced the plates whenever it moved.

Subin adjusted his grip and watched the rhythm of the glowing crystals. Rather than attack the armored body again, he waited for the creature to plant its forelimbs and begin forcing its way toward the pillar.

Then he cut.

Simple Edge slipped between two plates near the base of the creature's neck, severing one of the channels feeding energy into its shell. The blue glow flickered, and Yerin immediately drove her spear into the exposed gap, widening the injury before the armor could reinforce itself.

The Burrower recoiled and struck the platform with enough force to crack the stone beneath its forelimbs.

Rafael pulled Tessa clear as part of the platform collapsed. Jae-hyun and Liu Wei secured the retreating side, preventing falling debris from blocking the route to the lift.

Subin remained between the creature and the mineral pillar. He had only a brief opening before the Burrower's defenses recovered, and he used it to cut across the damaged connection beneath its head. The creature's front half dropped heavily against the platform, its crystalline growths dimming.

Subin's final thrust ended the fight.

For several moments, the chamber remained still except for the sound of falling stone. Ara confirmed that the creature's mana signature had vanished, then hurried to inspect the mineral pillar for structural damage.

"The pillar is cracked, but it hasn't lost stability," she said. "We should leave before another collapse begins."

The lift mechanism activated with a deep mechanical hum. Its platform rose from the lower shaft and locked into place beside them.

Tessa stared at it in disbelief. "You repaired it."

"Ara repaired it," Jae-hyun corrected. "The rest of us mostly prevented the room from falling apart."

"That still counts," Rafael said.

They helped Tessa onto the lift and gathered the records and equipment she had preserved. Before ascending, Subin looked once more toward the lower tunnel. The larger Burrower had been protecting the mineral pillar—or feeding from it—and its death had left the chamber quieter than before.

The expedition had no reason to remain and investigate every branch. They had rescued a missing miner, documented a powerful creature, and discovered a route that Ironvein could potentially use to recover its lost access to the lower mines.

The lift carried them to an upper maintenance corridor, where Kellan and an Ironvein rescue party were waiting. Tessa's return stunned the guards, and within minutes she was being escorted toward the settlement's medical quarters.

Dren arrived shortly afterward to hear the report. He was visibly relieved to learn that another member of the missing crew had survived, though his concern deepened when Ara showed him the mineral pillar readings and the location of the larger Burrower.

"We'll close the lower mine until our engineers can assess the damage," he said. "No more crews will be sent down without a proper survey."

Subin agreed with the decision. The Deep Veins contained valuable resources, but the risk of sending unprepared miners into those passages was too high.

That evening, Tessa recovered enough to speak with the expedition. She confirmed that the original crew had encountered multiple tunnels branching beneath the mineral pillar, with at least one route continuing far beyond the surveyed area. She had never reached the end of it, but she remembered seeing artificial lights in the distance before the collapse.

"Could they have come from another settlement?" Ara asked.

"I don't know," Tessa replied. "They were too far away to tell. But they weren't the crystals. The lights moved in a straight line, like lamps carried by people."

Subin listened without drawing conclusions. The Deep Veins were larger than Ironvein's maps suggested, and there were still passages they had not explored. That was enough reason to return eventually, but not before the settlement had secured its mines and prepared a proper expedition.

For now, the next stage was clear: Ironvein would repair its northern route, while Subin's team would use the information gathered underground to plan a journey deeper into the Great Passage.

He had come looking for new territory and stronger opponents. The Deep Veins had offered both, along with a reminder that the most dangerous places were not always the ones that announced themselves with a roar.

Sometimes, they were simply the passages nobody had survived long enough to map.