The Under-Dust Trial

The red chalk cross on the timber barricade was still wet when Volya reached the entrance of Sector Four.

Two heavy baulks of square-hewn pine had been spiked across the archway, braced by iron dogs driven directly into the living root-struts. Beyond the wood, the air had turned the color of stagnant pond water—a thick, yellow-green particulate haze that rolled off the lower loam beds in slow, heavy waves. The Town Council’s quarantine notice had been nailed to the upper crossbar, its municipal seal smeared by grease and coal soot.

Volya did not bother reading the decree. The only part of the timbering that mattered was the four-inch gap between the lower pine log and the damp shale floor.

Dropping to one knee, Volya checked the seal on their salvage goggles. The replacement lenses held firm in their brass wire mounts, but the tallow sealant smelled sour against their cheeks. Volya pulled the cloth respirator snug over their mouth and nose, sliding the two fresh charcoal inserts into the cheek valves until the felt gaskets clicked shut.

In their chest, the Blight Reservoir hummed with a quiet, oily warmth.

Two charges stored. Twelve silver coins in the inner lining of the extractor coat. A dark-steel billhook—oil-quenched, heavy in the tang, balanced four fingers above the grip—hung from the leather loop at their hip.

Volya slid beneath the pine barricade, belly to the cold stone, and dragged the billhook clear of the wood.

The moment their boots dropped into Sector Four, the ambient pressure thickened. It was not simple humidity. The Hollow was an enclosed biological engine, and when an entire sector of its root-architecture collapsed, the surrounding ecosystem did not wither quietly; it decomposed with violent, pressurized ferocity. The air tasted of vine-acid, boiled turnip greens, and old copper.

Every breath through the respirator required a conscious pull of the diaphragm. Tiny flakes of glowing sulfur-mold drifted through the gloom like dying sparks, settling on Volya’s wool sleeves and smoldering into greasy grey spots.

Volya stepped over a shattered cedar support beam that had snapped under hundreds of tons of dropping loam. According to the oilcloth survey map in their breast pocket, Sector Four had once contained three terraced fungal beds farmed for blue-stem agaric and heavy starch-roots. Now, the terraces were a churned slope of black shale, ruptured fungus trunks, and weeping mud.

Volya kept their pace slow, planting each boot heel firmly to avoid sliding into the drainage gullies. Their goal was twofold: locate an unruined cluster of weeping-spore bulbs to pay back the cost of their gear, and find the structural shear point where the collapse had started.

Thirty paces into the drift, the charcoal filters began to fail.

The felt inside the cheek valves grew damp with alkaline moisture. A sharp, stinging warmth crept down the back of Volya’s throat, followed immediately by the greasy taste of rotting cellulose. Their chest tightened as the passive bio-load forced its way past the barrier.

Volya paused behind a fractured column of petrified peat, coughing into their mask. A thin bead of black phlegm gathered at the corner of their mouth.

Gauging the particulate saturation through the refraction of their oil-smeared goggle lenses, Volya steadied their breathing against the rock. The ambient suspension was too thin for a full harvest, but their lungs were already taking damage.

The class absorbs rot, Volya reasoned. If I can't safely pull the dispersed haze directly into the core, I can ground the charge through dense metal.

Reversing their grip on the dark-steel billhook, Volya channeled a controlled trickle from their Blight Reservoir down through the rivets into the heavy tool steel. The tang flared with a muted, jade-colored sheen. By establishing a localized osmotic gradient along the blade's leading edge, the weapon acted as an external catalytic anchor, drawing the surrounding acidic vapor out of their immediate breathing pocket and depositing it as inert slag along the spine of the steel.

The stinging heat at the back of their throat eased into a manageable thrum. It was not a permanent solution, but their nerve and quick calculation had bought precious minutes of clear sight.

A sharp, rhythmic clinking sound cut through the hiss of weeping sap.

It came from the western root-wall, twenty paces up a jagged scree of broken limestone. Volya crouched, unhooking the billhook. They climbed the scree on three limbs, keeping their profile below the yellow vapor line.

Tucked into a natural hollow between two massive, intertwined taproots was a structure that did not belong in an abandoned quarantine sector. It looked like an oversized diving bell constructed from riveted boiler plate, cured ox-hide, and thick leaded glass. A manual brass bellows projected from the side, driven by an eccentric iron cam that rocked back and forth on a counterweighted water-drip.

Above the hatch, a crudely painted wooden placard read: KNOCK ONCE. SCRAPE YOUR BOOTS. DO NOT BREATHE MY AIR IF YOUR LUNGS ARE DIRTY.

Volya did not knock. The charcoal filters were sizzling against their cheekbones, and their vision had started to tunnel at the periphery.

Volya caught the iron latch of the outer air-trap, threw their weight against the lever, and tumbled into the narrow vestibule.

The outer door clanged shut on a heavy rubber seal. A foot pedal sat on the grate beneath their knees. Volya kicked it down with their heel. A pressurized jet of lime-water and pressurized steam hissed from overhead nozzles, scouring the acidic spore dust from their extractor coat and washing it down a copper drain.

The inner hatch swung open with a shriek of dry hinges.

A skinny man in an oilcloth apron jumped back from the threshold, brandishing a long pair of bronze pruning shears like a boarding pike. He wore triple-stacked brass loupes over his left eye and a wide leather collar studded with dried sprigs of bitter lavender.

"Out! Get out! Scrape the tallow off your heels, you reckless idiot!" the man barked, his voice vibrating with frantic, birdlike agitation. "I just balanced the nitrogen in this chamber forty minutes ago! Forty minutes! And you drag in three liters of verge-sludge on your shoulders!"

"The outside is forty-two parts per million," Volya rasped, yanking the spent respirator down to their neck and spitting a mouthful of dark bile into the drainage grate. Their lungs seized in a violent, rattling cough.

"I know what the outside is, you lumbering mole!" The botanist lowered the shears by an inch, peering through his magnified lenses at Volya’s coat. "I have seven mercury gauges plumbed directly into the root-strata! I knew the ceiling dropped before the fat bastards on the Council finished their afternoon porridge!"

"You're Mikhailov," Volya said, leaning against the damp copper doorframe while their pulse hammered in their ears.

"Of course I'm Mikhailov! Who else would maintain an unsealed atmospheric nursery in the middle of a collapsing root-shelf? The Guild surveyors? Those cowards won't come twenty paces past the timber dogs without six wagons of lime and a priest!" Mikhailov hopped sideways, adjusting a brass cock on a glass retort that was bubbling with pale amber liquid. "What are you carrying on your belt? That steel is stained with gall-acid. Real gall-acid, not the diluted swill they press in the South Mill."

"Harvested it in the flue below the Upper Verge," Volya said, catching their breath. The air inside the shelter was cool, smelling heavily of damp peat, charcoal, and medicinal mint.

"And you lived?" Mikhailov leaned close, his spectacles magnifying a pair of bloodshot, intensely analytical grey eyes. He sniffed at Volya’s collar, then tapped the brass tip of his shears against the iron tang of Volya's billhook. "No lung rot. No peripheral lichen blooming under the fingernails. Your vascular pressure is elevated, but your core hasn't turned to mush. You're using an unindexed harvesting class."

"Spore-Reaper," Volya said bluntly.

Mikhailov froze. The twitching rhythm of his hands stopped completely. "The necrotic siphon build? The one old man Vanov tried to draft before he went missing into the Lower Marrow?"

"I don't care about Vanov," Volya cut him off sharply, their fingers tightening on the billhook handle. "I care about not choking on my own blood when I walk through Sector Four."

Mikhailov stared at Volya for two seconds, then burst into a dry, clattering laugh that sounded like dry seed pods shaking in a jar. "Prickly. Good. Prickly extractors die slower than polite ones. But your build is half-baked, kid. You're storing the blight in your central reservoir like a donkey packing grain sacks, while the ambient runoff is poisoning your capillaries. Look at your hands."

Volya raised their right hand. The skin along the thumb and index finger was flushed a dark, bruised violet where the biological toxicity had settled into the small blood vessels.

"The charcoal filters buy you fifteen minutes," Mikhailov said, turning back to his worktable. "After that, the moisture in your breath turns the spore dust into acid paste. If you can't vent the cellular load, your stamina hits zero in an hour, and then the Hollow eats you from the stomach out."

"Can you teach the venting method?" Volya asked.

"Teach you?" Mikhailov snorted, picking up a tray of glass test-tubes. "Knowledge has an exchange rate, extractor. Look at my third propagation bed."

He pointed with his shears toward the back of the shelter. Behind a pane of cracked plate glass lay a rectangular bed of dark, sterile peat. In the center, three large, bulbous fungal growths hung from a suspended willow vine. They were weeping-spore bulbs—smooth, translucent, and glowing with a faint, pulsing azure luminescence. But creeping up the root-struts beneath them was a thick, black, tumorous growth that leaked foul-smelling brown grease.

"Weeping-canker," Mikhailov said, his voice dropping into bitter anger. "When the root-shelf broke two hours ago, the vibration cracked my outer wall. The necrotic seep got into the bed. If I cut it with bronze shears, the shock will rupture the main bulbs, and fifty silver coins' worth of pristine alchemical spores will turn to black sludge. I need that canker pruned without mechanical pressure."

Volya walked over to the glass partition, studying the pulsing black growth.

"If I siphon the canker," Volya said, "I take on the entire necrotic mass. My reservoir only has two open slots."

"Then don't just suck it into your belly like a pig at a trough," Mikhailov snapped. "A Spore-Reaper isn't a bucket; it's a bellows. You draw the heavy rot into the core, filter the vital essence for your reservoir, and force the volatile vapor out through your skin pores in time with your breath. You use the vascular gradient."

Volya looked from the pulsing tumor to Mikhailov. "Walk me through the cycle."

"Step inside the partition," the botanist said. "And if you pop my bulbs, I'll lock the outer hatch and let you scrape the loam with your teeth."