The deeper they ventured into the fallen beast's domain, the more the world outside seemed to peel away, layer by layer, until only silence and breath remained. The entrance shrank behind them, swallowed by twisting stone and jagged ice, while the cold wind that once howled like a starving predator softened into a whisper that slid along the cave walls like a lingering ghost. Haruna led without hesitation, her steps steady, her posture alert, while Elira followed with restless curiosity and Kael remained between them, her weakened frame supported more by will than strength.
The path narrowed briefly, forcing them to pass between towering stalagmites of frost that glistened faintly, their surfaces reflecting warped fragments of the trio as if the cave itself was watching them pass. Each step echoed deeper than it should have, the kind of echo that didn't just repeat sound, but stretched it, distorted it, until even their breathing felt borrowed.
Then, the tunnel opened.
Haruna raised a hand instinctively, stopping the other two before they could take another step, her instincts flaring just a heartbeat before their eyes adjusted to the sight before them. What lay beyond wasn't just a chamber. It was something preserved. Something hidden.
A field of crystalline formations stretched across the cavern floor, clusters of translucent ice rising like frozen blossoms. Between them, delicate spirit flowers bloomed, their faint luminescence painting the entire chamber in a soft, ethereal glow that pulsed gently, almost like a heartbeat. Their light reflected across the walls, dancing over ancient carvings and natural stone alike, turning the entire space into something that felt less like a cave and more like a forgotten sanctuary.
At the center of it all rested a pool.
The water glowed.
Not brightly, not harshly, but with a quiet radiance that seemed to breathe alongside the chamber itself. Ripples formed slow, hypnotic patterns that stretched along the cave walls, refracting light into moving constellations that shimmered across the ceiling. Even the air felt different here, warmer, heavier, filled with something that settled into the lungs and eased tension without asking permission.
Elira stepped forward first, her eyes wide with undisguised wonder as she turned slowly, trying to take in everything at once. "So… this is it…" she murmured, her voice softer than usual, as if speaking too loudly might break the illusion. "The Spring of Hernus."
Haruna tilted her head slightly, her gaze still scanning the chamber rather than the beauty of it. "Hernus?"
Kael let out a quiet breath, the faintest smile touching her lips despite her exhaustion. "A name more than a person, honestly. A legend that doesn't even bother proving it exists."
Elira, already halfway to the carvings etched along the walls, ran her fingers lightly across them, careful, almost reverent. "He's supposed to be one of the greatest explorers ever recorded. Came to the forest over a century ago to map it… alone. No one knows why."
"Some say it was a royal commission," Kael added, her tone calmer, more grounded. "Others think he was just insane enough to try."
Elira shot her a look, grinning. "Either way, whoever wrote that story knew this place. There's no way someone could imagine this much detail without standing here."
Haruna listened quietly, her attention drifting not to the carvings, nor the flowers, but to the water itself. Something about the story tugged at her thoughts, faint but persistent, like a thread she couldn't quite grasp. A lone explorer. A hidden sanctuary. The quiet pull of something unknown. It stirred something familiar in her, something that didn't belong entirely to her.
Her gaze softened for a moment.
Then it shifted.
"…So this Hernus," she spoke again, her tone steady, "what does he have to do with this place?"
Elira turned, gesturing toward the spring with both hands. "According to the story, this was his resting place. Somewhere he came to recover after pushing himself too far. After the book came out, people started calling it the Spring of Hernus. A way to honor him… even if he never existed."
Haruna gave a small nod, her interest settling not on the legend, but on the function. Without another word, she stepped forward, boots touching the edge of the water. The moment her foot broke the surface, a subtle warmth wrapped around her skin, spreading upward like a quiet embrace that stood in complete defiance of the freezing world outside.
"I learned about places like this from my teacher," she said as she waded in, her voice calm, almost thoughtful. "When a magic core forms beneath flowing water, it slowly dissolves. The Astrons seep into the current, altering it over time."
Elira blinked. "Wait… the magic spring theory?"
Haruna shrugged lightly. "If that's what you call it."
The water rose to her waist as she moved deeper, her movements unhurried, deliberate. "It only works if the flow passes directly through the core. Otherwise, it's just… water."
Without warning, she dipped beneath the surface.
Both girls stiffened immediately.
"Haruna—?" Elira took a step forward, tension flashing across her face, but before she could call out again, the water stilled.
Below the surface, the world shifted.
The glow dimmed, replaced by a deeper, colder light as Haruna's eyes adjusted. The bottom of the spring wasn't far, but what rested there was unmistakable. A large crystalline formation, embedded just above a narrow opening in the earth, pulsed faintly as streams of bubbles escaped from beneath it. The water flowed directly over the structure, eroding it slowly, patiently, carrying its essence upward.
A magic core.
And a powerful one.
Even after what must have been decades, perhaps centuries, it remained intact, its density far beyond anything ordinary stone could replicate. The constant exposure had only begun to wear it down.
Haruna observed it for a moment longer, committing the structure to memory.
Then she resurfaced.
Elira exhaled sharply. "Are you okay?!"
Haruna brushed wet strands of hair from her face, letting out a small chuckle. "You two worry too much." She turned slightly, gesturing toward the water. "Well? What are you waiting for?"
Both of them froze.
"…Huh?" Elira blinked.
Haruna tilted her head again, genuinely confused. "We came here because she's injured, didn't we?" Her gaze shifted toward Kael. "This is better than any flower you'll find."
Kael hesitated, her eyes lingering on the glowing water, uncertainty written plainly across her face. "But… something like this… it's too valuable to just…"
Haruna laughed softly, the sound echoing lightly across the chamber. "You're freezing, poisoned, and barely standing. I think we can afford to be a little selfish."
There was a pause.
Then Kael nodded, slowly, reluctantly.
She began removing her outer layers, the heavy coat, gloves, and boots discarded one by one until only what was necessary remained. Her movements were careful, measured, but there was no denying the strength in her frame, even in her weakened state. As she stepped closer, she dipped a toe into the water, only to pull it back slightly as a wave of warmth surged upward, carrying with it a faint pulse of energy.
"…It's… alive," she muttered under her breath.
Haruna simply watched.
Then Kael stepped in fully.
The reaction was immediate. The tension in her shoulders eased, her breath deepened, and the faint discoloration around her wound began to fade as the water worked silently, drawing out the venom that had settled deep within her veins.
Elira, on the other hand, had no such hesitation.
"Move!"
Before either of them could react, she had already stripped down and launched herself forward, diving into the spring with reckless enthusiasm. The impact sent a burst of water upward, splashing both girls completely as she resurfaced with a loud gasp, followed immediately by laughter that echoed brightly through the chamber.
Haruna couldn't help but laugh along.
Kael groaned softly, wiping water from her face, her cheeks faintly flushed from both the heat and the chaos. "You couldn't just… walk in like a normal person?"
"Where's the fun in that?" Elira grinned, already splashing water in her direction.
Within moments, the quiet sanctuary shifted. Laughter replaced silence. Ripples broke the stillness of the glowing pool as the two girls began splashing each other, their movements light, playful, almost childlike despite everything they had endured.
Amid it all, Haruna leaned back against a smooth rock near the edge, the warmth of the spring seeping into her muscles as she let out a slow breath. In her hands rested the mask.
Haruki.
Her thoughts shifted inward.
"This really is like a hot spring…" Haruki's voice echoed within her mind, tinged with something dangerously close to envy. "You're seriously enjoying that without me? That's cruel."
Haruna's lips curved slightly. "I told you it would be worth it."
"You're making it worse."
"Don't worry", Haruna replied, her gaze drifting toward the glowing water. "I'll bring the core back. If we can recreate something like this… and if you figure out how to sync our senses properly…"
There was a pause.
Then—
"Now I have to figure it out."
The determination in Haruki's voice sharpened instantly.
"You said that way too casually. Now I want it. Immediately."
Haruna let out a quiet laugh, her shoulders relaxing further as she sank slightly deeper into the water. "Then do your best. I don't mind being your test subject."
"You say that like it's a favor."
"Isn't it, miss Haru?"
Haruki scoffed lightly. "Don't get cocky. I'm the genius here."
"I'll be waiting, then."
Haruna lifted the mask, placing it gently over her face as the connection deepened, allowing Haruki to begin experimenting. Around her, the laughter of the other two continued to echo, filling the chamber with a warmth that had nothing to do with the spring itself.
For a moment, in a world carved by conflict and survival, time loosened its grip.
And the mountain, for once, let them rest.
...