The scenery shifted the moment they crested the pass.
The lush greenery of the slopes had been stripped away, leaving the raw, jagged rock exposed. Gaping maws of tunnels littered the mountainside, while rusted rails snaked across the earth like skeletal vines. Amidst the swirling dust, a rotted minecart lay overturned. Its wheels were warped, and its wooden crates sat empty and scattered.
Clustered together were the shells of huts where workers once lived, their windows now boarded shut. Whenever the wind gusted, signs rattled with a hollow clatter-clack, and for a fleeting second, Koyoi thought she could hear the faint echoes of voices from a distant past.
Beside one of the mine’s entrances sat a small, stone-stacked shrine—a remnant of the miners' prayers for protection. The offering plates were shattered, cradling nothing but stagnant rainwater. Koyoi pressed her palms together in a brief, silent gesture, offering a prayer to the Earth God for their safe passage.
"...A mine?"
"Yeah. Apparently, they used to dig copper here," Asahi said. "It’s been an abandoned mine for a long time now."
"Why did they shut it down?"
"Frequent cave-ins, from what I heard. That... and the strange lights. Once those started appearing, people stopped coming near the place."
Strange lights.
Koyoi turned the phrase over in her mind. Had the lights started because the Observers arrived? Or had the Observers come because of the lights?
The mouth of the shaft was sealed with wooden planks, a "Keep Out" sign dangling from a nail. Every time the wind blew, the boards rattled and groaned. A draft of cold air seeped through the gaps, carrying a damp, stinging scent that pricked at her nose. Koyoi hunched her shoulders and tightened her grip on her drawstring pouch.
"...I have a bad feeling about this."
She pressed the pouch to her chest. Inside, the Wind God was trembling with anxiety.
...Inside, black. ...Hear, a sound.
"A sound?"
Koyoi strained her ears. From deep within the tunnels came a faint, rhythmic noise.
Clink. Clink. Clink.
It sounded like a pickaxe striking rock. Or perhaps the mechanical pulse of a machine. Beneath that rhythm, there was a high-pitched scraping of metal. She heard no human voices. Who was down there, and what were they striking for?
Koyoi pressed her ear against the wall. A faint moan resonated from deep within the stone—a wordless voice. It felt as if the earth itself were in pain. The light in her heart flickered, and she bit her lip. The clink, clink continued at steady intervals. It was like a heartbeat, pulsing from the depths of the ground. Koyoi memorized the rhythm, using it to feel out the direction they needed to go.
"There shouldn't be anyone in there, right?"
"No. But if it's the Observers, that's a different story."
Asahi used his sword to pry the boards from the entrance.
"We’re investigating. They might be up to something."
As the boards fell away, a cloud of dry dust billowed up. Koyoi covered her mouth with her sleeve, stifling a cough. The sound of the rain outside faded, replaced by a heavy silence that filled the tunnel.
It was pitch black inside. The air was thick with moisture and the smell of mildew. Puddles pooled at their feet, fed by slow drips from the ceiling. Old lamp brackets remained on the walls, marked by black streaks of soot. At the edges of the path, collapsed supports leaned precariously; it looked as though the whole place might cave in at any moment. Koyoi kept her breathing shallow and her footsteps light.
She spotted fresh footprints at the edge of a puddle—the mud was still holding the shape of the tread, as if someone had stepped there only moments ago. She signaled to Asahi with a look, and they moved forward with even greater caution. The tracks were spaced with a mechanical, unnatural regularity. The gait of an Observer machine, she realized. Koyoi straightened her back and focused her breathing into a thin, steady stream.
"Light."
Asahi struck a torch. The flickering flame illuminated the tunnel walls, casting long, wavering shadows that looked like ghostly figures. Koyoi instinctively glanced behind her, but there was no one there. The walls were covered in countless scars from tools, a silent testament to the toil of those who had worked here long ago.
At a bend in the tunnel, a prayer talisman was plastered to the rock. On the faded paper, she could just make out the characters for Earth Guardian. A forgotten prayer, lingering even in a place like this. An old pickaxe lay nearby, its wooden handle dried and cracked. Inside a wooden crate sat an empty mess tin with a name carved into the bottom. The traces of someone’s life were quietly piling up in the dark.
Koyoi traced the talisman with her finger and offered a short prayer in her heart. The Wind God gave a small, fluttering response, and for a moment, the air in the tunnel seemed to soften. But that softness was quickly drowned out by a mechanical vibration.
As they went deeper, the sound grew louder.
Clink. Clink. Clink.
And then, a lower, heavier drone. A deep thrummmm... like the sound of a massive engine. The vibration traveled up through the soles of her feet; the ground was shivering. The Wind God curled up tight inside the pouch, on high alert as they neared the tunnel’s end.
The air grew progressively drier, making the back of her nose sting. The smell of rain vanished, replaced by the heavy scent of metal and oil. Koyoi’s heart raced. She tucked her hands into her sleeves as if to protect the light in her heart. She could feel the Wind God’s presence thinning; the air here was too stagnant for the wind to move freely. Koyoi took a deep breath, steeling herself to face the darkness where the wind could not reach.
Asahi whispered a short "Let's go" over his shoulder. Koyoi gave a silent nod.
The tunnel went deeper and darker. Cold air clung to her ankles. Trust the light. The darkness is deep. The sound is the path. No turning back. Resolve is set. Into the depths. Now.
"...A machine."
Koyoi was certain. Deep within this shaft, an Observer machine was waiting.
"No doubt about it," Asahi replied in a low voice. "They’re digging for something. The ley lines... or a god."
Koyoi swallowed hard and pulled the pouch close to her chest. The Wind God trembled, on high alert toward the end of the tunnel. They locked eyes and nodded. There was only one way forward.
Past the next bend, the old rails split in two. One path was choked with rubble from a cave-in; the other was lined with fresh electrical cables. The metallic lines acted as a guide into the gloom. Koyoi placed a hand on the wall, feeling the faint vibration. A pulsing movement was radiating from deep within the earth.
"...It’s alive," she whispered.
Asahi nodded back. What was being stolen here was, without a doubt, life itself.
"Get down."
Asahi doused the torch. They held their breath in the sudden total darkness.
From up ahead, a light approached. A cold, white beam, like a flashlight. Then, footsteps.
Tap. Tap. Tap.
Metallic soles splashed through a puddle, sending a spray of cold water against Koyoi's cheek.
Observers. They were here too.
Asahi pressed a hand to Koyoi's shoulder, ushering her into the shadows of the wall. They stifled their breathing, Asahi shielding the glowing embers of the torch with his sleeve. The light drew closer, and the footsteps passed them by. The Observers seemed to be carrying something; she heard low mechanical whirs mixed with the screech of metal on metal.
"Output rising."
"Ley line flow... stabilized."
The synthetic voices echoed through the tunnel, sharp and piercing. The sheer soullessness of the sound made Koyoi’s skin crawl.
"...Now."
Asahi signaled with only the movement of his lips. Koyoi nodded and silently asked the Wind God to still the water at their feet. A gentle breath of wind pressed down on the surface of the puddles, killing the sound of their movement.
The two of them slipped deeper into the darkness, certain that the Observers' true purpose lay just ahead. Behind them, the footsteps faded until the tunnel reclaimed its silence. The sound of dripping water returned, and the only thing Koyoi could hear was the loud thudding of her own heart. She exhaled slowly, hardening her resolve. The Wind God spun in a small circle, pointing the way deeper into the gloom. Asahi reached for his sword, then paused.
In this silence, they had to move. They locked eyes one last time and stepped wordlessly into the next layer of shadow.