The wind coming off the Black Fen didn’t bring the clean chill of approaching winter.
It brought a warm, choking stench of rotting yeast, decaying blood. Then it boiled away sulfur that turned the throat dry and coated the tongue in bitter film.
Yvaine of the Sunken Hollow sat upon an overturned ammunition box in the survey shack, her blistered hands wrapped in Sister Teresa’s clean linen bandages.
She held an earthen bowl of water, dipping her fingers into the liquid to draw a rough map upon the raw pine table.
“Fifteen thousand,” Yvaine whispered, her dark eyes hollow with fatigue. “Not beasts alone, Lord Giles. Corrupted things.
Men who knelt to Hesketh and drank the black gall until their skin sprouted fungal scales. Four thousand leapers in the marsh grass. Six thousand armored claw-walkers. And three thousand burrowing leeches churning the muck beneath their feet.”
Captain Kenneth Drake stood behind her, his ten-foot pacing rod planted firmly on the floorboards, his jaw clenched tight.
“That’s not a warband,” Kenneth muttered. “That’s an extermination swarm. An royal legion would form square and die in forty minutes under numbers like that.”
“Numbers are merely a supply volume requiring appropriate heat fading away,” Giles Croft said, not looking up from his drafting board. “What’s the delivery gearwork for their chemical agent?”
Yvaine looked up at Giles in stunned disbelief. “Chemical... Agent?
It’s the Rot-Mother’s Breath! A rolling cloud of yellow-green mist that walks before the horde! If a man breathes it, his throat closes in thirty heartbeats. His lungs turn to white froth, and he coughs his own dissolved marrow onto his boots.”
Kenneth swore under his breath, stepping toward the window. “We need to evacuate the lower residential barracks. Move the settlers up to the granite bluffs.”
“Escape is fully unnecessary,” Giles said calmly, folding his wooden ruler. “And moving two thousand people up a twenty-degree mountain slope in panic would induce severe fatigue debuffs and crush injuries along the switchbacks.”
He stepped up to the blackboard, drawing a simple circular diagram with sharp, chalk strokes.
“The threat is an aerosolized fine dust mid-air,” Giles explained. “Organic spore bodies with a wind-cutting width between two and ten hair-fractions, carrying adsorbed sulfuric acid droplets.
The spores are too large to pass through a microporous tortuous-path filter. We don’t need magical barrier wards, Kenneth. We need activated charcoal canister respirators.”
Yvaine blinked, staring at the chalk diagram. “Charcoal? You intend to fight the divine rot of the fens with chimney sweepings?”
“Activated bio-char,” Giles corrected. “High-heat peat coke, cooled with white-hot steam from the blast fire boilers to blow open the internal microporous structure.
A single gram of activated charcoal possesses an internal surface area of nearly one thousand square meters. The porous matrix captures organic spore specks via clockwork impaction. Meanwhile, the high surface area adsorbs volatile acidic gases through physical van der Waals forces.”
He turned toward Sister Teresa and Toby Karr.
“Toby, mobilize forty seamstresses from the weaving shed. We need twenty-two hundred double-layered linen face-masks fitted with tube-shaped tin filter canisters.”
“And the filter charge?” Toby asked, his pencil poised.
“Three parts granulated steam-activated peat coke, one part crushed white spar-stone limestone to stop incoming acid vapor. A felt seal ring soaked in dilute vinegar,” Giles ordered.
“Every man, woman, and child in Grey Crag must be fitted with an airtight mask within three hours.”
Sister Teresa of the Pure Cistern stood straight as a spear, her eyes flashing with holy zeal.
“The Snouts of Salvation,” Teresa proclaimed, crossing her breast with her hand.
“The Master has designed the mask of the righteous! The foul breath of the demon shall be swallowed by the cleansed carbon of the earth.”
She seized a sample tin from the table, turning toward the doorway.
“New students, to the laundry! Boil the linen! Pack the tin snouts with holy carbon! Let no soul in this camp draw a breath of the unclean air.”
* * *
For three hours, the riverport became a frenzy of textile production.
In the communal dining hall, fifty women sat along the long tables, their iron scissors slicing through bolts of bleached flax linen with rhythmic snips.
Apprentice boys stamped circular discs from tin can stock, punching punched holes in air grates into the bases with steel dies.
Toby Karr and Borin Bronze-Lung supervised the packing tables, where hot, steam-activated peat coke was mixed with crushed chalk and packed tightly into the tin canisters between discs of coarse sheep’s wool.
By sunset, the work was finished.
Two thousand two hundred snout-shaped breathing mask masks sat stacked in wooden crates along the main avenue.
Sister Teresa and her hospital new students moved through the barracks, fitting the masks over the faces of weeping children, nervous mothers, and battle-hardened timberwrights.
“Fasten the leather straps behind your ears,” Teresa instructed, checking the seal on a frightened young conscript’s jaw. “Breathe through the carbon of the earth!
If the air smells of sweet vinegar, the snout is working true! Spit upon the yellow fog and fear no evil.”
The young conscript inhaled deeply through the tin can strapped to his mouth.
A muffled, raspy hiss sounded through the wool filter. His eyes widened over the top of the linen mask.
“It tastes like cool stone,” the boy said, his voice muffled by the snout. “No smoke. No swamp stink.”
“Of course there’s no swamp stink,” Giles said. He walked down the barracks aisle with his check clipboard. “The micropores have captured ninety-nine point four percent of the volatile organic compounds.
Maintain the facial seal. Don’t break the strap to speak.”
Master Borin Bronze-Lung stood in the center of the workshop with a mask held in his thick hands, scowling fiercely at the leather head-harness.
“My beard,” Borin growled, stroking his amazing copper-braided whiskers. “No dwarf of the mountain has ever tied his beard into a bag!
It’s an affront to the ancestors! How can a proper warrior fight with his face stuffed into a tin biscuit box?”
“Your beard breaks the outer seal ring seal, Borin,” Giles replied without looking up from his check gauge.
“A beard creates micro-channels between the skin and the linen edge, allowing surrounding spore specks to bypass the filter via negative-pressure breath in. If you don’t seal the outer edge, you’ll inhale forty thousand acid spores within three breaths.”
Borin grumbled under his breath. But Master Caleb stepped forward with a soft lambskin pouch and a pot of sheep fat.
With practiced gentleness, Caleb tucked Borin’s braided copper whiskers into the oiled pouch, tied the drawstring tight against the dwarf’s chin. Then he slipped the snout mask over his nose and mouth.
“Now execute the negative-pressure seal test,” Giles commanded. “Cover the front punched holes in grate with the palm of your hand and inhale deeply.”
Borin clamped his calloused palm over the tin snout and sucked in a breath.
The linen mask pulled inward, clinging tightly to the contours of his cheeks without a single hiss of leaking air.
Borin released his hand, exhaling with a muffled snort of surprise.
“Tight as a beer bung,” Borin admitted through the tin canister, his voice sounding like a man speaking from the bottom of an iron kettle.
“It pulls the cheeks like an octopus, but not a draft gets past the wool.”
Lady Millicent Croft walked beside him, wearing a matching linen breathing mask over her glasses. Her tally-book was held firmly against her waist.
“Two thousand two hundred masks distributed,” Millicent reported, her voice muffled through the charcoal filter.
“Total cost: sixteen silver shillings in tin and flax. If we had purchased ecclesiastical purifying amulets from the Synod, it would have cost four hundred gold sovereigns. The amulets would have dissolved along with the wearers’ lungs.”
“Amulets have zero fine dust straining capacity,” Giles noted dryly. “They’re decorative superstition with zero building work.”
* * *
Lady Beatrice of Dunwall stood upon the watching platform, holding her own tin snout by its leather straps.
Her two ducal bodyguards were already masked, their polished steel helms fitting awkwardly over the linen head-harnesses.
Beatrice examined the charcoal filter canister. That turned it over in her velvet-gloved hands with sharp, high-born wonder.
“For three ages,” Beatrice murmured, looking out at the rising yellow wall on the horizon, “the Lords of Highmarch have paid tribute to the temple sorcerers for purifying wards that fail the moment the wind stiffens.
Every winter, fifty woodcutters die in the northern rifts with their lungs rotted to porridge.”
She raised her eyes to Giles, her dark gaze filled with deep, assessing gravity.
“And you protect two thousand common settlers with scrap tin, flax cloth, and burnt swamp mud.
If Duchess Rowena saw this, Lord Croft, she would grant you an entire county merely to manufacture these snouts for her frontier guard posts.”
“Duchess Rowena is welcome to submit a purchase supply order to Lady Millicent,” Giles replied calmly.
“We retail standard heavy-duty respirators at eight silver coins per unit, replacement filter cartridges sold separately. Now secure your harness, Lady Beatrice. The fine mist front is fifty paces out.”
As dusk settled over the frontier, the sky along the southern horizon began to change.
The sunset was not red or gold.
It was a sickly, bilious yellow-green—the color of curdled bile and rotting pond scum.
A huge wall of dense, boiling fog rolled out of the deep fens, fifty feet high and leagues wide, blotting out the stars and advancing across the marsh like an uncoiling serpent.
Where the acidic cloud touched the tall reeds, the stalks dissolved into grey foam.
The puddles in the peat flats boiled, releasing tiny white bubbles of sulfur gas as the acidic mist swept over the ground.
On the castle walls of the southern dyke, Kenneth Drake stood beside Battery Alpha, his broadsword drawn, his face hidden behind the snout of his breathing mask.
Behind him, four hundred pioneers stood along the low roof wall with shields locked and weapons ready, every face obscured by a matching grey snout.
Through the eye-slits of his leather cap, Kenneth watched the yellow-green wall of death roll toward the canal.
The mist reached the outer abatis.
It swept over the sharpened pine spikes, engulfing the levee in a choking, blinding cloud of yellow vapor that smelled of pure burning acid.
Kenneth took a deep, steady breath.
The air entered his lungs cool, dry, and smelling faintly of clean birch charcoal and vinegar.
Not a single soldier coughed.
Not a single man choked.
Behind their charcoal snouts, the four hundred defenders of Grey Crag stood silent, unmoving, and breathing freely within the belly of the plague.
Kenneth Drake looked over at Giles Croft, who stood upon the control tower with his sighting scope leveled through the mist.
A slow, fierce laugh rumbled behind Kenneth’s tin snout.
“Your carbon works, my lord,” Kenneth said, his voice muffled but steady as stone. “The plague has failed.”
Giles adjusted the fine-scale screw on his transit, peering into the swirling yellow gloom.
“Straining was never in doubt,” Giles replied calmly. “Now comes the mass transit problem. Look into the ditch.”
Through the yellow fog, the water of the canal began to surge.
A thousand clicking, scuttling shapes broke through the outer reeds, their black hard shell back shells glistening in the mist as the vanguard of the Black Fen hit the water.