Mithril Caves – Depth: 500 Meters (Layer 1: The Old Mines). Midday (Absolute Darkness).
The world beneath the surface followed its own laws. Down here, time seemed to grind to a halt. There was no rising or setting sun, only an eternal, heavy darkness ready to swallow any sliver of light that dared to intrude.
The footsteps of twenty-five people echoed through the vast stone corridor. CLACK... CLACK... CLACK... The rhythmic clatter of their iron-shod boots bounced off the damp, mossy walls, creating a monotonous, almost hypnotic cadence. The crystal headlamps on their helms were their only anchors to sanity, sweeping across cave walls that shimmered with veins of iron ore and raw quartz crystals.
But the light offered no comfort. On the contrary, the shadows birthed in the corners of the cave seemed to possess a life of their own—like blackened fingers tracing their every move. At this depth, the air was cold, stagnant, and oppressively heavy. The primal scent of damp earth mingled with the pungent, sharp aroma of ancient fungi.
Sir Riven led the vanguard. His heavy shield was raised halfway, covering his vitals. He was on high alert, his eyes scouring every crevice and dark turn. He gripped the haft of his Chain-Axe so tightly that his leather gloves let out a faint, rhythmic creak. Behind him, Captain Garrick and his men pointed their spears in every direction, their fingers stiff against the triggers of their backup muskets.
After an hour of descending the steep, spiral passage, Riven sensed an anomaly.
"It's... far too quiet," Riven whispered. His voice, suddenly shattering the silence, made several soldiers behind him flinch in surprise.
"What do you mean, Rianor?" Riven asked from the center of the formation. His eyes never strayed from the compass and the leather map in his hands.
"A cave this deep..." Riven halted, staring into the darkness ahead with a furrowed brow. "It should be noisy. Water dripping, the skittering of cave rats, or at the very least, the sighing of the wind. But this? It's hollow. Total silence. If I stop moving, I can't even hear my own breath."
Lady Rumina approached the cave wall. She brushed the smooth, damp surface with the tip of her glove. "Riven is right. Even the moss won't grow here. The walls are too clean, as if they've been sanded down. There's no insects, no signs of organic life whatsoever."
"Elara's sonar is negative as well," Elara added, tapping her sensor staff, its tip blinking weakly. "No biological signatures within a five-hundred-meter radius. It's as if we're walking inside the belly of a gargantuan tomb."
They resumed their march with redoubled vigilance. The silence began to exert a psychological pressure on them. Every rustle of their armor sounded like a thunderclap in their ears.
Thirty minutes later.
"Stop!" Rianor commanded abruptly. His voice was sharp.
"Contact?" Riven immediately dropped into a defensive stance.
Rianor held up the compass. The needle was spinning wildly, a full three hundred and sixty degrees without pause, like a top that had lost all control. "The magnetic field here is erratic. We've just crossed the threshold. We're in an anomaly zone."
"Look ahead," Lady Rhea whispered. Her keen eyes could pierce the darkness better than anyone else in the team. "Twelve o'clock. There's light."
Riven directed his helm light toward Rhea's mark. In the center of the vast cavern lay a flat, open area. And there, stood an ancient encampment.
Remnants of canvas tents, torn and rotted by age, clung to the ground. Ancient mining tools—rusted pickaxes and shattered wooden carts—lay scattered. In the middle sat a pile of cold ash from a campfire that had likely been extinguished decades ago.
But it wasn't the objects that made their blood run cold. It was the inhabitants.
Twelve human skeletons, still draped in the tatters of old miners' uniforms bearing the faded crest of the Aethelgard Kingdom, sat in a circle around the dead fire. Their positions were eerily... casual.
One skeleton leaned against another's shoulder, as if mid-nap. One held a metallic cup in its boney fingers. Another still gripped a deck of cards whose colors had long since bled away. There were no signs of a struggle. No broken bones. No unsheathed weapons. They had simply died where they sat.
"Merciful gods..." Garrick whispered in horror, lowering his spear. "They died while they were resting?"
Elara mustered the courage to step closer. She examined one of the skeletons with her medical magic, touching the gaping jawbone. "No residue of poison or gas in their bones," Elara analyzed. "Their gas masks were still neatly tucked around their necks. They must have felt the air was perfectly safe."
"Then what killed them?" Riven asked, the hair on his neck standing on end. "Mass heart failure?"
Rianor knelt beside a skeleton that appeared to be the squad leader. He reached into a fragile pocket and pulled out a small leather-bound logbook. The paper was yellowed and brittle, but the magical ink ensured the final entry remained legible.
Rianor read it aloud, his voice echoing in the hollow cave:
"Day 40. We found the door. But we are weary. The sound... ah, the sound is so beautiful. Like a mother's lullaby. We don't want to go home. Why return to that cold world when it's so warm and peaceful here? The hunger is gone. The pain in my legs has vanished. We just want to sit here... listen... and sleep."
Rianor closed the book slowly. "They starved to death," he concluded coldly. "They sat here, hypnotized by that 'sound,' until they forgot to eat, forgot to drink, forgot even to move. They died in a hallucinatory euphoria."
TINK.
Suddenly, a faint chiming sound rang out. It was soft, resembling a small silver bell swaying in the wind. Or perhaps, the distant, muffled humming of a woman.
Everyone went still. They exchanged wide-eyed looks.
"Did you hear that?" Rumina asked.
"Hear what? I hear nothing but my own breathing," Riven replied, panic beginning to seep into his voice.
"A bell," Rumina said softly. "No... it's like a song. It's so beautiful."
"I hear nothing, Rumina," Riven said firmly. "Elara? You?"
Elara shook her head, her face deathly pale. "No. But my mana sensors are vibrating violently. There's an unnatural energy wave."
"I hear it..."
The voice came from the rear. A soldier named Borch lowered his spear. His once-vigilant eyes were now vacant, his pupils dilating. An eerie, misplaced smile tugged at the corners of his lips.
"The voice... it sounds like my wife..." Borch murmured. "My wife who passed five years ago..."
Borch began to step out of formation. He marched toward a dark tunnel on the left—a passage that wasn't on Rianor's map. "Wait for me, my love... I'm coming..."
"DO NOT LISTEN!" Elara screamed. She slammed her staff against the stone floor.
BOOM!
A shockwave of mana exploded, slamming into Borch's back. Not to harm, but to jolt his nerves. Borch gasped, falling to the ground. His eyes blinked rapidly in confusion. "Wh-what? Where... where am I?"
"You almost walked off a cliff, you idiot!" Garrick barked, hauling his man to his feet.
"A psychic assault," Elara said, her breath hitching. "Something is broadcasting a low-frequency sound wave. It hits the nervous system directly, dredging up happy memories to sedate the mind."
Rianor understood instantly. "The guardian of Layer One isn't a physical monster. The guardians are Subterranean Sirens."
"EVERYONE! ACTIVATE REBREATHER MASKS NOW!" Rianor commanded. "Not for air! Use the Sound Isolation mode! Rumina, activate the White Noise Generators in your helms! Do not allow a single second of silence in your ears!"
Everyone scrambled to adjust their masks. CLICK. HISS. A steady static hum filled their ears, blocking out the mysterious melody. Their world was now noisy with synthetic crackle, but at least their sanity remained anchored.
But Riven... whose battle instincts were the sharpest... saw something. At the end of the dark tunnel where Borch had nearly lost himself. Within the pitch darkness beyond their lights, a pair of glowing blue eyes ignited.
They weren't the eyes of an animal. They possessed a swirling, spiral pattern that spun slowly. And they were staring at Riven with a terrifying intensity.
"Rianor," Riven called through the comms, his voice taut with tension. "We aren't alone down here."
"Something has been watching us from the start."