The ground beneath the Black Fen riverport trembled with the deep, sickening hum of a dying earthquake. Across the newly drained southern basin. There, three miles of black peat lay exposed beneath the gray mist, an ancient horror moved.
It was sixty feet from horned snout to barbed tail. A huge, amphibious monster clad in linked, rainbow-bright scales the color of stale oil. Three snake-like necks reared forty feet into the sky, their crested heads crowned with jagged hard-shelled horns that cried green, smoking bile.
Surrounding the titan was an emerald envelope of blinding arcane light. A nonstop, ball-shaped water-pressure mana-barrier thirty yards in width. Wherever the shimmering membrane touched the marsh, the peat water hissed and parted, held at bay by the crushing water’s skin of an ancient god-beast’s soul.
From the riverport’s outer timber stronghold, Captain Kenneth Drake lowered his iron-shod trenching rod. His weathered face was pale as winter animal fat.
“Springalds Two and Three, release!” Kenneth roared, his voice cracking against the wind.
TWANG-THWACK!
Two four-inch braided sinew cords snapped forward. Heavy six-foot balista spears, tipped with cold-forged mountain iron, screamed across the marsh at one hundred and sixty feet per second.
They struck the emerald barrier dead-center.
There was no explosion. There was no thunder. The iron spearheads contacted the semi-clear green membrane. Then, the striking force of the four-pound steel bolts was absorbed instantly across the entire ball-shaped lattice. The spears simply stopped dead in mid-air, their ash shafts shattering into matchsticks. They fell harmlessly into the bog like tossed twigs.
“It... It drank the iron,” Kenneth whispered, his hands trembling as he gripped the low roof wall. “The Shield of the Drowned Wyrm... It absorbs every blow and spreads it across the entire sky! Even a royal trebuchet battery couldn’t crack an isotropic ward like that! We have nothing that can pierce it!”
“Of course you don’t,” a flat, dry voice remarked from the ladder-well. “Because you’re hurling giant wooden toothpicks at thirty meters per second against an isotropic fluid membrane with a two-hundred-and-fifty split second refresh cycle. Did nobody in this military guard post take basic freshman physics?”
Lord Giles Croft stepped onto the timber platform. He held a brass fine-scale slide rule and an oilskin-wrapped blueprint folio. Behind him came Master Borin Bronze-Lung and Master Caleb Thorne-Wood, with eight straining dwarven guards hauling a long, canvas-wrapped crate on an iron-wheeled hand-truck.
“Lord Giles!” Kenneth shouted, pointing a wild finger toward the approaching horror. “That beast is three miles out and moving at twelve knots! Its acid breath will melt our wooden stockade in seconds, and its barrier can’t be breached by physical engines!”
Giles raised his twenty-four-inch earth-measuring sighting scope, squinting through the crosshairs at the shimmering green dome.
“Your premise is fundamentally flawed, Captain,” Giles said calmly. He slid his cursor across the logarithmic scale. “You treat that mana shield as a total spirit wall. It’s nothing of the sort. It’s a fluid-dynamic mana membrane with water’s skin and a finite propagation speed. When your clumsy balista bolt strikes, its impact duration lasts several hundredths of a second. That gives the hydra’s central neural nodes two hundred and fifty split seconds to channel reserve aether to the contact point and fade the impulse.”
He tapped the sighting scope tube with a fingernail. “To bypass an isotropic barrier, one doesn’t increase gross projectile mass. One collapses the impact duration until it’s four orders of size smaller than the barrier’s refresh latency, while concentrating striking force thickness onto a tiny frontal area.”
Before Giles’s eyes, the pale amber screen swelled with sharp, authoritative sharp-angled blueprints.
Borin Bronze-Lung wiped cold sweat from his forehead. It looked between the approaching swamp beast and the clockwork monstrosity emerging from the wooden crate.
“Giles...” Borin rasped, his eyes bulging. “You call this a deep-rock core-sampler?! You had our foundry smiths pour sixty billets of our highest-grade pig iron, forge sixteen layered leaf springs of oil-cooled spring steel, and broach two eighteen-foot copper-inlaid rails to a limit of two-thousandths of an inch! And that... That needle inside the chamber!”
“It’s a care geotechnical exploration tool,” Giles replied without blinking. “If a large living entity chooses to obstruct the survey hall, that’s a matter of town right-of-way enforcement.”
Master Caleb and the dwarven smiths quickly hoisted the weapon onto its heavy cut stone mounting yoke.
It didn’t look like any siege engine ever conceived in the mortal kingdoms. It was an eighteen-foot-long, low-profile clockwork accelerator. Its twin guiding rails were cold-broached from forged steel, inlaid with thick, polished copper power bars and braced by sixteen external high-pressure clamping ribs.
At its breech sat a huge twisting force bank. Four sets of pre-stressed layered alloy leaf springs, capable of storing two hundred thousand foot-pounds of clockwork potential energy, wound back by a geared cranking crank winch connected to a heavy cast-iron hand-crank.
Coupled to the breech was a bank of thirty Leyden-jar pulse charge banks, wired directly to the thermoelectric generator loops installed around the 40-foot blast fire down on the wharf. The glowing charge banks hummed with a dark, low-hum spark drone that raised the hairs on the back of every man’s neck.
“Load the penetrator,” Giles commanded.
Toby Karr stepped forward, carrying a slender, heavy wooden box lined with oiled velvet.
Inside lay a projectile that defied all medieval convention. It wasn’t a spear or a cannonball. It was a thirty-eight-two-pound, fin-steadied discarding-armor-piercing dart.
The core was a solid rod of mana-hardened heavy dark metal-hardened carbon-iron alloy, sixteen inches long and barely an inch and a half in width. It ended in a needle-sharp chisel tip designed for extreme sectional thickness. Wrapping the dense core was a four-petal, lightweight runic sky-alloy sabot shoe, engineered to seal the copper rail guides and catch the first moving surge before peeling away cleanly into the slipstream upon muzzle exit. Borin had planed each sabot petal by hand on an oilstone to ensure instant release at Mach velocities.
Borin stared at the gleaming, dull-gray heavy dark metal dart, his chest heaving with dwarven awe. “Heavy dark metal... The unbending bone of the deepest roots. We could only soften it by burning three high-hearth charcoal crucibles with bellows running night and day... And you ground it into a piercing dart with diamond dust.”
“Diamond paste on a cast-iron lapping plate, rotated at six hundred turns a minute,” Giles corrected evenly. He slid the sabot assembly into the lubricated breech chute with a steady, practiced push. “Care tooling eliminates friction, Borin. Without a true mirror finish along the driving band, the screen would weld under spark pushback before the armature reached the second support post.”
CLACK-CHUNK!
The breech block—a four-inch slab of forged pig iron—dropped shut. Then he locked with an airtight, clockwork snap.
Giles stepped up to the height yoke. He loosened the brass locking collars on his twenty-four-inch sighting scope, mounting the sight tube directly atop the rail-lance’s sight bracket.
“Maeve,” Giles called out. “Tracking data report.”
From the forward bartizan, sentry Maeve Swift-Ear pressed her curved brass ear-trumpet against the stone low roof wall. She listened to the rhythmic ground-shaking thuds of the hydra’s talons.
“Range: eighteen hundred and fifty yards!” Maeve shouted, her voice ringing clear. “Bearing: South-Southwest! Height angle: plus one degree fourteen minutes! Wind from the east at seven knots!”
Giles leaned over the sighting scope’s eyepiece. His fingers made tiny, tiny shifts to the fine-threaded fine-scale screws.
“Listen carefully to the mathematics, Master Borin,” Giles muttered, checking his slide rule one final time. “The hydra’s barrier membrane has a physical thickness of about three inches. At our designed muzzle speed of nine hundred and fifty meters per second—Mach two point eight—the heavy dark metal needle will cross that membrane in exactly thirty-one point six split-seconds.”
Borin blinked, fully lost. “Thirty-one... Micro-seconds?”
“Zero point zero three one six seconds,” Giles said flatly. “The barrier’s mana-replenishment cycle needs two hundred and fifty split seconds to react. That means our projectile will pass fully through the magical lattice before the barrier’s control nodes even register that contact has occurred. The local pressure will exceed nine gigapascals, triggering instant shear puncture.”
He adjusted the height screw two hair-thin degree marks upward.
“Also,” Giles added, “a medieval trebuchet stone spreads ninety kilojoules of energy across half a square meter of contact face—a meager zero-point-one-eight megajoules per square meter. Our heavy metal dart concentrates seventeen point one megajoules onto a twelve-square-inch needle point. That’s fourteen thousand three hundred megajoules per square meter.”
He looked at Kenneth, his gray eyes cold and unbending.
“Over seventy-seven thousand times the striking force thickness of a royal siege stone. We aren’t testing its armor, Captain. We’re demonstrating material shear failure.”
Out on the fen, the Mire-Hydra paused. Its three snake-like heads reared back, their jaws unhinging to reveal rows of semi-clear, needle-like teeth. A sickening, acid-burning green glow gathered in their throats.
A wave of packed acidic gas, capable of dissolving flesh and stone alike, was preparing to vomit across the riverport.
“Target got,” Giles said softly.
He placed his right palm against the brass firing lanyard connected to the dual-stage trip release.
“Toby. Kenneth. Borin. Cover your ears and open your mouths.”
“Open our mouths?!” Borin squawked.
“If you don’t equalize pressure across your Eustachian tubes, the faster-than-sound shifted weight excess pressure will rupture your ears,” Giles said casually.
He pulled the lanyard.