The dungeon gate loomed before Eren like the mouth of some ancient beast. It stood half-buried in a hillside, stone carved with runes that pulsed faintly in rhythm with his heartbeat. Each line glowed a soft blue, fading in and out like breathing.
[Quest Triggered: Enter the Whispering Dungeon.]
[Difficulty: Unknown.]
Eren exhaled, his hand tightening around his sword. "Unknown, huh? Figures."
Behind him, a group of rookie adventurers shuffled nervously. He'd met them earlier at the guild—three fresh faces who'd begged him to come along since he was the only one with a "System strong enough to analyze danger."
The youngest, a red-haired boy, gulped. "You sure this is a good idea, Eren? I heard the Whispering Dungeon drives people mad."
Eren smirked. "Then let's hope we're not that easy to break."
As the gate creaked open, a gust of cold air swept over them, carrying faint whispers that seemed to crawl beneath their skin. The light of their torches flickered weakly, as if afraid to enter.
The dungeon was unlike any cave he'd seen before. The walls shimmered faintly with veins of silver light that twisted like roots, and the air thrummed with low, rhythmic vibrations. Every step echoed too long, as though the dungeon itself was listening.
[System Notice: Unidentified energy signature detected.]
[Advisory: Proceed with caution.]
They moved deeper, torches trembling in their hands. The further they went, the louder the whispers grew—distorted, fragmented, and hauntingly human.
"…help me…"
"…the code is breaking…"
"…return the core…"
The group exchanged frightened glances. Eren tried to steady his breathing, though something in those voices tugged at him—something painfully familiar.
When they reached the main chamber, it opened into a cavern so vast it seemed to swallow sound. At its center floated a massive crystal, cracked and pulsing with dark mist.
Eren's eyes widened. "A dungeon core?"
The rookies stayed behind him. One whispered, "Something's wrong with it."
He stepped closer. The whispers grew sharper, almost screaming now. His System flickered.
[Error: Unable to synchronize.]
[Warning: Memory interference detected.]
Suddenly, the world blurred.
He was standing in the rain, a child again—mud clinging to his bare feet. Someone called his name. A small boy with lighter hair stood at the gates of the orphanage, waving.
"Brother, come back!"
Lightning flashed. The image shattered.
Eren stumbled, clutching his head. "What the hell was that?"
[System Alert: Memory bleed confirmed.]
The crystal flared violently, and from its surface, a shadow emerged—a twisted humanoid shape with glowing red eyes and fragments of armor embedded in its form. The rookies screamed.
"Fall back!" Eren shouted, drawing his sword.
The creature lunged. Eren's instincts took over. He dodged, feeling his System hum with power.
[Skill Unlocked: Shadow Step Lv.1]
[Skill Unlocked: Execution Slash Lv.1]
He vanished, reappearing behind the monster in a blur of motion. His sword struck true, cleaving through the creature's side. Black mist burst from the wound, howling like a thousand voices at once.
The rookies could only watch in awe. Eren moved again, faster this time, each step leaving a faint echo of himself in the air. His final strike split the creature in half, light flooding the cavern.
When the dust settled, the dungeon fell silent.
[Quest Complete: Dungeon Core Secured.]
[Reward: Unknown Data Fragment.]
A small shard of glowing light floated toward him. It settled in his palm, pulsing softly.
[Data Fragment: Code–ΔRiel]
He froze. "Riel?"
The name echoed in his head, stirring something deep inside—a memory just out of reach.
The red-haired rookie spoke shakily. "Eren… who's Riel?"
He shook his head slowly, still staring at the shard. "I don't know," he lied.
But deep down, he did.
He didn't know why, or how, or even from where—but he could feel it. That name meant something. Someone.
Outside the dungeon, the sky had darkened. The stars flickered dimly through a heavy mist as they made their way back to Valtheris. The rookies laughed nervously, relieved to have survived.
But Eren stayed quiet, hand pressed against the pouch where he'd hidden the shard.
[System Notice: Unknown Data Fragment integrated.]
[Sync anomaly increasing by 0.6%.]
A faint pain sparked behind his eyes, and the whispers returned—soft now, almost gentle.
"Brother…"
Eren froze. He looked up at the night sky, the city lights glowing in the distance, and for a moment… he thought he saw another world staring back.