Eren didn’t sleep that night.

  Every time he closed his eyes, the same sensation returned—a low, rhythmic pulse deep within his chest. It wasn’t painful, but it was impossible to ignore, like a second heartbeat that didn’t belong to him.

  By dawn, the faint glow had faded from his palm, but the feeling remained.

  Something was calling him.

  He stepped outside just as the first light crept over Grayhaven’s rooftops. The village looked the same as always: stone paths damp with morning dew, smoke curling from chimneys, distant voices preparing for another ordinary day. Yet Eren felt utterly out of place, as if the world had shifted while he stood still.

  The pull came again.

  Stronger this time.

  Eren turned toward the eastern hills, where the land darkened and the air seemed heavier—the Ashen Border. Everyone in Grayhaven knew the name. No one talked about it willingly.

  Old ruins lay scattered beyond those hills, remnants of a forgotten age. Adventurers sometimes passed through the village, armed and confident, speaking of monsters, unstable magic, and treasures that rarely made it back alive. Children were warned never to go there. Adults pretended it didn’t exist.

  But now, Eren felt it as clearly as he felt the ground beneath his feet.

  The pull wasn’t fear.

  It was recognition.

  He packed lightly.

  A worn cloak, a water flask, dried bread, and the small knife his father had given him years ago “just in case.” Eren hesitated before leaving, glancing back at the village one last time. No dramatic farewell. No sudden realization from anyone else.

  The world hadn’t noticed he was changing.

  Yet.

  The path toward the Ashen Border grew rougher with every step. Grass thinned, soil darkened, and strange, gray stones began to surface from the earth like exposed bones. The air smelled faintly of metal and ash, and Eren’s Core reacted instantly—warmth spreading through his chest, his senses sharpening.

  A case of literary theft: this tale is not rightfully on Amazon; if you see it, report the violation.

  He stopped.

  For a brief moment, the world seemed… clearer.

  He could hear his own breathing. The rustle of wind through broken stone. Even the subtle vibration of something moving beneath the ground.

  Eren swallowed.

  “So this is it,” he murmured.

  A ruined archway loomed ahead, half-collapsed and etched with symbols he didn’t recognize. As he stepped closer, the Aether Core pulsed sharply, sending a surge of energy through his body. His vision blurred—and then snapped back into focus.

  Lines.

  Faint, shimmering outlines traced the archway, highlighting cracks, weak points, and something deeper—hidden patterns carved into the stone.

  Eren staggered back.

  “What… was that?”

  The knowledge came without words.

  Perception enhanced.

  Basic Aether Sense: Active.

  His heart pounded. He hadn’t spoken the words, yet he understood them instinctively, as if the Core itself was guiding him.

  This power wasn’t random.

  It had rules.

  The moment he passed beneath the archway, the temperature dropped.

  The land beyond was silent—unnaturally so. No birds. No insects. Even the wind seemed reluctant to enter. Broken pillars lay scattered across the ground, their surfaces scorched and eroded by time.

  Eren took another step.

  The ground shifted.

  A sharp crack echoed beneath his boot, and suddenly the stone beneath him collapsed inward. He barely had time to react before sliding down a steep incline into darkness.

  He hit the ground hard, air bursting from his lungs.

  Pain flared—but he was alive.

  Groaning, Eren pushed himself up. The chamber around him was dimly lit by glowing veins of pale blue crystal embedded in the walls. Dust drifted slowly through the air, undisturbed for centuries.

  And then he heard it.

  A low growl.

  Eren turned.

  From the shadows emerged a creature unlike anything he’d seen before—low to the ground, its body twisted and asymmetrical, as if stitched together by corrupted magic. Its eyes glowed with a dull crimson light, fixed entirely on him.

  The Core surged.

  Not fear.

  Warning.

  Eren tightened his grip on the knife, instinct screaming that this was no ordinary beast. The creature lunged.

  Eren reacted without thinking.

  He moved.

  Too fast.

  The world seemed to slow as he sidestepped the attack, the blade grazing the creature’s hide and sending sparks of blue energy scattering into the air. The impact surprised them both.

  The creature recoiled, shrieking.

  Eren stared at his own hand.

  “That wasn’t me…”

  The Core pulsed again, stronger, urging him forward. Power flowed through his limbs—not controlled, not refined, but real.

  The creature charged once more.

  This time, Eren was ready.

  When the chamber finally fell silent, Eren stood trembling amid the remains of the shattered monster. His breathing was ragged, his body aching, but his Core burned with an unfamiliar heat—stronger than before.

  Something had changed.

  Faint symbols flickered across his vision, gone as quickly as they appeared.

  Trial initiated.

  Survival confirmed.

  Eren sank to one knee, staring into the depths of the ruin ahead.

  This wasn’t an accident.

  The Ashen Border wasn’t just calling him.

  It was testing him.