Shattered Glass

How long does it take for four hundred pounds of quicksilver-backed glass to crush a person when the floor gives out?

I didn't want to calculate the answer, but with the Citadel's iron claxons screaming like dying locomotives and the crimson mercury globes above strobing against basalt, my brain ran the physics anyway. Two seconds to snap the collarbones. Three to liquefy whatever remained inside the ribcage.

"Tierney!" Brynn shrieked over the deafening mechanical wail. She was pressed flat against the inner vault bulkhead, clutching her satchel of unused thermite like a toddler with a stolen doll. "The door sealed! The whole damn Citadel knows we're in the pantry!"

"Shut up and grab the harness straps," I snapped, dropping to both knees at the foot of the central pedestal.

The First Mirror towered eight feet above us. In the strobe of the red alarm lamps, its flawless surface didn't just reflect our panicked faces. It drank the light. The mercury pool sealed inside the glass hummed at a low, violent frequency that made my molars ache and the silver scar on my left wrist pulse with raw heat. Kellum stood at my left flank, his hand hovering two inches from the glass frame. His black coat was drawn back, his pale jaw tight, his dark eyes wide and predatory.

"The syndicate transponder leads are live," Kellum said. His voice was shockingly low, cutting right beneath the blare of the sirens. "If you wrench the frame off the pedestal before you sever the vacuum lock, the pneumatic fail-safe triggers. It will shatter the core and flood this chamber with pressurized liquid mercury."

"I know how my father builds his vaults, enforcer," I muttered, sliding my tungsten scraper from my utility belt. "Hold the lower mounting bracket. If you drop it, we die in liquid metal before the Guild guards even reach the threshold."

Foster moved up on my right, his massive shoulders blocking the view of the sealed bulkhead. He racked a bolt into his repeating winch crossbow with a heavy iron clatter, his scarred face grim. "We have maybe ninety seconds before the first squad of Citadel guards blows that door off its hinges with a breaching cylinder. Take the glass, Tierney. Fast."

My fingers were already moving.

This was the craft I had run away from for five years. This was the exact sequence of pneumatic tolerances Arthur had made me memorize by candlelight until my palms bled from slip-wrenches.

I jammed the flat edge of my scraper beneath the left vacuum suspension valve. The seal hissed—a sharp, toxic puff of vapor that smelled of rotten eggs and bitter zinc.

"First release," I said through gritted teeth.

The left hydraulic arm clicked and disengaged. The massive glass slab titled three degrees, its immense weight shifting instantly toward the floor. Kellum caught the lower steel flange with bare hands. His knuckles turned bone-white under the strain, his supernatural muscles locking like iron girders as he absorbed the shock.

"Got it," he rasped. A vein pulsed along his neck. "Second valve, Tierney. Now."

I slid across the basalt flagstones, ignoring the sharp bite of stone through my canvas trousers. The right bracket was tighter, corroded with fresh syndicate tallow from the betrayal trap Arthur had wired into the pedestal. I brought the heel of my palm down hard against the scraper's handle.

Crack.

The brass bleeder sheared. The vacuum broke with a wet, sucking gasp.

"Brynn, the harness!" I yelled.

Brynn scrambled forward on her hands and knees, dragging the padded leather extraction sling across the dais. Together, Kellum and Foster lowered the eight-foot monolith into the reinforced webbing. The glass was ice-cold, thrumming against my palms with a heavy, living weight that sent a ripple of static through my blood. We buckled the four cross-straps in three synchronized motions.

"Mirror secured," Foster grunted, looping the drag-harness over his broad chest. "Now how the hell do we get out? The outer lock is dead-bolted from the exterior."

"The bulkhead seals outward against assault," I said, rising and wiping grease from my forehead. "Citadel engineering doctrine. My father designs every vault to withstand a siege from the undercroft. That means the internal emergency fire-purge system is pressurized to vent outward into the antechamber."

I pointed to the brass intake manifold set into the wall beside the sealed doorway.

"Brynn, your third nitric acid canister," I ordered. "Pour it directly into the primary pressure regulator. When the seals dissolve, the hydraulic fluid will back up into the piston housing."

Brynn didn't ask questions. She yanked the glass canister from her belt, smashed the wax cap with her pliers, and dumped the smoking acid straight down the regulator's intake funnel.

The copper piping hissed. Smoke billowed from the joints, white and acrid.

"Stand back!" I shouted, grabbing Kellum's sleeve and hauling him toward the rear dais.

Two seconds later, the hydraulic regulator ruptured with the sound of a cannon shot.

A blast of boiling oil and pressurized steam erupted from the wall. The massive tungsten bulkhead, caught between the expanding gas and the sheared locking pins, was violently shoved outward on its track. It slammed into the antechamber floor with a deafening metallic crash, throwing up a cloud of pulverized limestone.

Beyond the threshold, the service corridor was already filled with running footfalls and shouting men.

"Move!" Kellum snarled.

He didn't draw a blade. He drew two heavy steel rods from his harness, his body blurring as he launched himself through the smoking doorway ahead of us.

I heard the first scream before my boots even crossed the shattered threshold.

A Citadel guard in polished silver-inlaid breastplate was coming around the corridor bend, his carbine raised. Before the man could pull the trigger, Kellum closed the twenty-foot gap in a heartbeat. He struck the weapon aside with one rod, hooked his heel behind the guard's knee, and drove him into the masonry wall with bone-splintering force.

The guard went limp and hit the flagstones.

"Three more coming from the north stairwell!" Foster bellowed from behind me. He was hauling the mirror harness single-handedly, his legs churning as Brynn guided the trailing edge of the padded cradle. "Tierney, lead the line!"

"South culvert!" I shouted, sprinting down the damp stone passage. "The drainage channel is our only clear vector!"

We tore through the undercroft corridors like hunted wolves. The strobe of the crimson emergency lamps cast long, monstrous shadows across the curved ceilings. Behind us, the Citadel had fully awakened. Horns echoed through the ventilation shafts. The heavy stomp of armored boots rattled the foundation stones.

We rounded the corner into the lower foundry hall—the vast subterranean chamber where raw silica and mercury were processed for the Guild's mirrors.

A volley of heavy steel bolts cracked through the air.

Thwack. Thwack. Ping.

Foster raised his heavy reinforced vambrace, deflecting a projectile that threw sparks against the stone. Another bolt shattered against the iron railing inches from my shoulder, showering my neck with stinging splinters.

"Down!" Kellum roared.

He caught me by the waist, sweeping me behind a row of cast-iron smelting vats as a second volley ripped through the smoke. The impact of his chest against my back was a jolt of pure kinetic heat. Through the thin fabric of my work shirt, the silver crescent on my wrist flared with a sharp, sympathetic ache. I could feel his heartbeat—fast, cold, and lethal—thumping in perfect rhythm with my own frantic pulse.

"Crossbow squad on the upper catwalk," Kellum whispered near my ear, his breath brushing my cheek. "Six marksmen. Silver-tipped quarry bolts. If they hit the mirror harness, they puncture the glass."

"Brynn," I whispered, peering around the iron rim of the vat. "Can you reach the base of that iron gantry with a thermite squib?"

Brynn was crouched in a ball beside Foster, her goggles askew, her hands trembling as she primed a cylindrical brass charge. "Reach it? I can hit it with my eyes closed if these bastards stop turning the air into a pin cushion!"

"Foster, lay down suppressing fire on the left catwalk," I said. "Three seconds. That's all she needs."

Foster didn't blink. He leaned around the iron vat, leveled his repeating winch crossbow, and pulled the double-trigger.

Clack-clack-clack-clack.

Four heavy quarrels arced through the gloom in rapid succession. One found the throat of a marksman; two struck the steel mesh flooring, forcing the other guards to dive for cover.

"Now, Brynn!" I yelled.

Brynn lunged forward, wound her arm back like a dockyard bowler, and hurled the thermite cylinder thirty feet across the foundry floor. It bounced once against the flagstones and lodged squarely under the primary support strut of the catwalk staircase.

She hit the remote friction detonator on her wrist.

A blinding flare of white-hot magnesium fire engulfed the gantry. The iron support groaned, twisted into liquid slag within three seconds, and collapsed with a catastrophic roar. The entire catwalk sheared away from the brick wall, dragging four shouting enforcers down into a tangle of twisted metal and smoking debris.

"Clear!" Foster roared, already heaving the mirror harness forward.

We bolted across the foundry floor toward the southern drainage culvert.

The iron grate we had melted during the infiltration hung loose, dripping black residue into the murky water below. But as we reached the archway leading to the sluice channel, a sharp mechanical grind echoed from the ceiling.

An iron portcullis—the secondary emergency flood gate—began to slide down from its overhead housing.

"Arthur's locking down the outer drainage!" I cried. "If that gate drops, we're sealed in the undercroft!"

The heavy iron teeth were already four feet from the floor, descending with relentless hydraulic pressure.

Foster didn't hesitate. He dropped the harness rope into my hands, lunged forward, and threw his massive shoulders beneath the falling portcullis.

The iron teeth slammed into his back with a sickening crunch of leather and bone. Foster roared—a guttural, animal sound of absolute defiance—as his boots dug into the slime-coated stones. The hydraulic mechanism strained, groaning against the sheer physical mass of the man holding it up.

"Foster!" Brynn screamed, reaching for him.

"Keep going!" Foster snarled, blood flecking his lips as his neck veins bulged to the thickness of rope. "Take the glass through the culvert! Go!"

"No! We can wedge an iron bar!" I shouted, frantically scanning the rubble for leverage.

"There's no time, little mirror-wright!" Foster's voice was raw, his eyes locked onto mine through the sweat and grime. Around the far bend of the corridor, heavy boots were thundering toward us—at least a dozen Guild enforcers armed with heavy carbines. "You paid me twenty-five gold to be the vanguard. I don't leave a contract half-finished. Get the bastard and the glass to the safehouse!"

"Foster—" Kellum stepped forward, his hand outstretched to haul the man free.

"Go, Noctis!" Foster barked, his gaze flashing to Kellum with fierce, unforgiving authority. "Keep her alive! If you let her die, I'll climb out of whatever hell they bury me in and tear your throat out!"

With a savage kick, Foster knocked his own repeating crossbow across the stone toward us, then reached to his belt and pulled the safety pins from the four remaining demolition charges strapped to his chest rig.

"Run!" he screamed.