The cold hit first.
Not the kind of cold that stiffens fingers after a long walk in winter — this was a creeping cold that ignored fabric and fur, sliding through seams, pooling in marrow. It didn't sting. It settled. Patient. Unyielding. As though the Vein itself was already measuring how long they could last.
Kaiden flexed his fingers, joints stiff, breath misting in the dim blue glow. The air tasted sharp, metallic, leaving a faint bite at the back of his tongue like iron filings.
The Frostbite Vein was silent in a way the outside world could never be. No wind. No rustling leaves. Just the slow, rhythmic glow of æsther lines running through the walls — veins of faint blue light pulsing like a heartbeat drawn in glass. Each pulse carried weight, and Kaiden couldn't shake the feeling that the rhythm wasn't just marking time. It was watching.
The walls shimmered faintly when torchlight passed over them — neither stone nor ice, but frostglass, mineral shot through with crystal. Smooth at first touch, yet etched with faint rune-lines like scars buried under its translucent skin.
[ Rio ]
"…Alright."
"So this is cheerful."
His voice seemed to travel too far, bouncing down unseen corridors and returning in softened fragments. Somewhere ahead, a drop of water fell — plink — then another, the irregular rhythm too slow to be comforting.
[ Peggy ]
"Don't talk too loud."
"Sound carries in crystal."
She shifted her shield on her back, her eyes scanning the seams in the wall like they might reveal a hidden path. Her boots crunched softly on the frost-coated floor. The sound felt too loud against the Vein's quiet.
Kaiden's gaze trailed the glowing veins in the wall. Some ran smooth and unbroken; others branched into narrow threads, the light inside them flickering slightly faster than the rest. He found himself stepping closer, almost unconsciously. The moment he did, the hum beneath his skin deepened, a low vibration running up his arm and settling near his sternum.
It wasn't just light. The Vein was alive — in a way that couldn't be seen, only felt.
[ Nerim ]
"Huh..."
Nerim scraped his gauntleted fingers across the frost, brushing loose flakes from a patch of wall. Beneath the ice, a marker glyph glimmered faintly, carved deep into the mineral. The sigil was round, its center still glowing faintly through decades of frost.
"This one's old."
"Really old."
[ Irna ]
"How old?"
"As in… five years?"
"Ten?"
[ Rio ]
"Don't tell me it's over ten."
Nerim leaned closer, rubbing at the ice to clear the symbol's lines. The glow flickered weakly but didn't die.
[ Nerim ]
"Try thirty."
[ Rio ]
"Thirty?"
"No one's supposed to leave markers unclaimed that long."
"Either the team never came back…"
"Or the Vein's been holding this place shut."
Kaiden's eyes lingered on the frozen glyph. If the Vein could hold a place shut…
Could it hold a person in?
The thought knotted in his chest, but he said nothing.
They pressed on. The tunnel branched twice, but the central path drew them forward — wider, smoother, the walls lined with thicker seams of light. The air tasted metallic at the back of Kaiden's tongue, sharp and bright, almost like chewing foil. Every so often, a faint draft brushed their cheeks, even though no openings were visible.
Peggy let her hand trail along one wall. She jerked back immediately.
[ Peggy ]
"Still cold."
"Colder than before."
[ Irna ]
"Mine's warm."
"Same as outside."
Kaiden's curiosity overrode his better judgment. He pressed his palm to the wall — and the blue veins flared brighter in a five-foot radius, the hum under his skin deepening until it seemed to sync with his own heartbeat.
[ Kaiden ]
"The Vein."
"…It's watching."
[ Rio ]
"Yeah, okay."
"That's not creepy at all."
The hum faded when he pulled his hand back, but the pulse in the veins took a full two beats to return to normal. He didn't think it was his imagination.
The tunnel narrowed, forcing them into a single file. Irna took point, shield drawn and ready. The blue veins along the walls here braided into a thick seam down the tunnel's center, glowing brighter than any they'd passed before. The ceiling dipped lower, frost-crystals hanging like jagged teeth.
Irna slowed to a stop, her breath misting heavily in the chill.
[ Irna ]
"Stop."
Kaiden craned his neck, trying to see past Rio. Irna morphed her guzheng into bow form, her eyes fixed on the far wall.
From ahead came a faint crack — sharp, brittle — followed by another. It wasn't the sound of rock shifting or ice settling. It was rhythmic. Heavy. Like something was moving inside the wall.
[ Nerim ]
"Something's in the wall."
A thin fissure raced down the center seam, spilling an icy glow. Frost fractured outward in jagged lines. Kaiden's chest tightened.
The wall split.
What stepped out was crystalline and wrong.
Its body was a jagged carapace of frostglass, edges catching and scattering the blue light like a prism. The limbs were jointed backward, insect-like, each step ringing faintly — ting — as shard scraped shard. There was no mouth, no eyes, just a faceted head that shifted smoothly as it turned to regard them.
[ Peggy ]
"…That's not in the Academy bestiary."
[ Rio ]
"Then we're making history."
Kaiden's instinct booted in, identifying the creature with his skill.
[ HEART ]
[ Æsther Construct: Guardian ]
Classification: Elemental (Ice)
Behavior: Protective
Weakness: Earth and Fire
Mortality: Æstherbound
Threat Level: Medium
But this time, his Awareness skill seemed to flicker.
[ HEART ]
Name: Frostvein Guardian
______
Further information blocked due to insufficient proficiency
______
[ * Kaiden * ]
"Huh..."
"Talk about new."
[ Irna ]
"Positions, everyone!"
They moved instinctively. Irna braced herself, taking the first impact head-on with her Resonant Aegis. The creature struck with the weight of falling stone, driving her back half a step. Although the damage was fully absorbed, the blow vibrated her shield dreadfully, running up her body.
Irna loosed an arrow filled with intentions at near point-blank range, keeping the creature fixated on her as she stood her ground. It did not bleed, but it leaked. A stream of æsther dissipating away from the cracked left arm.
Nerim darted to the side, pickaxe swinging in a tight arc. The steel bit into the creature's flank — and stopped. Instead of splintering, the frostglass absorbed the force, blue veins inside it flaring bright. The crack that appeared sealed almost instantly, knitting shut before Nerim could pull back.
[ Nerim ]
"…Oh, that's unfair."
[ Rio ]
"Hit harder!"
He thrust his spear at a joint in the creature's leg, but the tip skidded off in a shower of frozen dust. The creature's head rotated toward him in one smooth movement. Its claw arced low, slicing through the air with a hiss.
Rio jumped back, but the claw left a shallow groove in the wall, sending crystal fragments scattering.
[ Peggy ]
"Move, Rio."
"Let's add some bludgeoning to the mix!"
Her warhammer came down in a weighty swing, striking the creature's center mass with a deep, resonant crack. The blow should have shattered it — but again, the frostglass drank the force, the glow spreading in ripples.
Kaiden's instincts screamed at him. Direct strikes weren't working.
He ducked under Peggy's next swing, dagger in hand — but not to attack the creature itself. He jabbed the blade into the seam of glowing veins along the tunnel floor, prying loose a shard the size of his forearm.
He yanked it free and flung it under the creature's advancing leg.
The moment its weight came down, the shard splintered upward, jamming into the joint. This time, the frostglass didn't seal instantly. The blue glow there flickered erratically.
[ Kaiden ]
"Veins."
"They don't like losing their own veins."
[ Rio ]
"Then rip 'em out!"
The fight turned. They targeted the walls and floor, cracking or dislodging sections of the glowing seams. Each time the creature stepped into a weakened patch, the damage stuck longer.
It grew frantic.
Irna unleashed a barrage of arrows into a wall seam, chipping them bit by bit. Peggy's warhammer came down, smashing the crystal under its legs before it could shift away. Nerim's pickaxe finally bit into an exposed joint, and the crack spread up its leg until the entire limb shattered.
The creature staggered, light bleeding from the breaks, pooling into the floor like water. With one last, stuttering step, it collapsed, shards scattering in a ring around them.
Silence closed in.
The walls' pulse slowed again, their glow softening to a steady rhythm.
Rio prodded one of the fallen shards with his spear, frowning.
[ Rio ]
"Not much left."
"No core, no nothing."
"Just shards."
Kaiden picked up a shard piece — inspecting it diligently — before storing it and the rest of the spoil inside Voidspace.
[ HEART ]
[ Frostvein Shard ]
Durability: 1/1
Market Value: 1 copper
Grade: Common
[ Passive ] +0.05 RES (Cold)
Resonance: Awaiting
[ Irna ]
"Maybe it wasn't alive the way we think."
[ Peggy ]
"What'cha mean, girl?"
[ Irna ]
"Maybe it was just…"
"The Vein, wearing armor."
Kaiden crouched near the spot where the light had seeped away. The hum under his skin surged briefly, like a heartbeat skipping, then steadied.
It remembers, he thought.
And for the first time, he wasn't sure that was good.
[ Nerim ]
"We mark the path?"
Irna nodded, stepping to the wall. She pulled a small marker chalk from her belt and pressed it to the frost. A fresh marker glyph flared to life, clean and bright against the wall's muted glow.
The moment it stabilized, Kaiden felt it — a different pulse. Slower. Heavier. As if something far deeper in the Vein had just woken up.
They all felt it.
No one said anything.