The tungsten slag-skimmer drifted through the glowing crimson throat of the mantle.
Beneath its reinforced hull, a sluggish river of molten basalt flowed at thirty miles an hour, carrying the vessel deeper into the subterranean chasm. The radiant heat was ferocious, shimmering in visible waves that warped the air above the deck, but the barge's automated thermal dampeners held the internal cabin at a survivable ninety degrees.
Idris Calder sat on an overturned ammo crate, stripping the trigger assembly of his dart thrower. His fingers moved with mechanical precision, cleaning the carbon buildup from the pneumatic seals with a dry rag.
Across the narrow cargo bay, Vespera sat curled against the bulkhead. Her silver eyes were half-lidded, her breathing uneven. Along her collarbone, the hexagonal bronze socket was glowing with a dull, feverish red pulse.
"You're overheating," Idris said, setting the weapon down. He crossed the cabin, knelt beside her, and checked the temperature sensor on his analyzer. "That acoustic shockwave you threw at the Chime Tower... it drew too much power through your nervous system."
She didn't speak, but her eyelids fluttered, tracking his movements.
Idris searched the barge's emergency storage racks. He bypassed the rusted wrenches and spent hydraulic fluid until his hand struck an insulated cryo-locker bolted beneath the pilot console.
He popped the latch.
Inside, nestled in cold nitrogen foam, sat a cylindrical stasis canister. It had three circular slots. Two were empty, their seals broken centuries ago. But in the third slot sat a heavy glass vial filled with an iridescent blue fluid that shifted like liquid mercury.
The label on the collar was etched in pre-calamity lettering: STABILIZER REAGENT - ZERO HOUR.
Idris stared at the vial. He didn't touch it. He closed the locker and locked the deadbolt.
A sudden change in the barge's motion snapped him to his feet.
The low rumble of the lava river had deepened into a deafening, thunderous roar that vibrated through the hull plating.
On the navigation screen, the thermal sensor painted a terrifying cross-section: five hundred yards ahead, the basalt river abruptly terminated.
A sheer vertical drop of six hundred feet into an abyss.
"The thrusters are dead," Idris said, checking the helm. "The mooring cables melted when the Chime Tower collapsed."
The tungsten barge was accelerating, drawn by the terrifying gravitational pull of the cataract. Ahead, the river of fire poured over a jagged obsidian cliff into the void, forming a waterfall of liquid rock that vanished into a bottomless cavern.
Idris didn't panic. He slung his tool harness, grabbed two heavy magnetic grappling anchors from the deck winch, and dragged Vespera toward the open aft deck.
"On my mark, jump for the rock spur," Idris shouted over the roar of the falls.
Two hundred yards.
One hundred.
The heat was blistering, scorching the collar of his leather jacket.
Thwip-CLANG.
Idris fired the first magnetic anchor. The tungsten harpoon bit deep into the basalt ceiling forty feet above the river, its braided steel cable screaming as the winch spun out.
He fired the second anchor into a massive granite pylon flanking the cliff edge.
JERK.
The cables snapped taut with a violent shudder that nearly tore Idris's arms from their sockets. The barge swung violently sideways, slamming against the sheer canyon wall just ten feet from the lip of the molten waterfall.
The barge groaned, its hull crumpling against the stone.
"Move!" Idris yelled, hauling Vespera onto a narrow basalt ledge carved into the cliff face.
He unclipped the harness just as the barge's mooring pins sheared. The empty tungsten vessel slid over the edge, tumbling into the cataract of fire and disappearing into the depths below.
Idris collapsed onto his stomach, gasping for air on the narrow ledge. He looked down into the vast subterranean gulf.
Suspended in the center of the colossal cavern, held in place by dozens of titanium cables the thickness of redwood trees, hung an inverted city of steel and glass.
The Hanging Spire.
And miles beneath it, pulsing through the darkness like an artificial sun, was the rhythmic, amber heartbeat of the Core.
The only path to the Hanging Spire was a suspension cable six feet in diameter, stretching four hundred yards through empty air above the magma lake.
Idris tightened the climbing harness around Vespera's waist, clipping her tether to his own belt. "Don't look down. Look at the rivet line along the steel jacket."
They were halfway across the cable when the shadows above them detached.
Three figures dropped from the overhead cable mesh, landing on the curved steel surface with the agile grace of hunting spiders. They wore breathing masks made of recycled filter cartridges and lightweight exoskeleton frames fitted with pneumatic climbing hooks.
The lead climber was a woman with shaved temples and cybernetic optical goggles that glowed with green infrared reticles. In her right hand was a serrated rotary cutting blade; in her left, a sonic disrupter.
"End of the line, grounders," the woman said, her voice filtered through a cracked diaphragm. "Nobody walks the cables without paying the Spire toll."
Idris leveled his dart thrower at her chest. "We don't have scrap, and we don't have time. Stand down."
"You have the girl with the bronze socket," the woman replied, her rotary blade whining to life. "Commander Graven has put fifty thousand ration crates on her head. I am Sorsha, and this cable is my bank."
Idris didn't argue. His right ear implant picked up the high-frequency capacitor charge inside Sorsha's optical goggles.
He didn't aim for her chest. He unclipped his acoustic analyzer, cranked the output knob to maximum feedback, and pointed the broadcast cone directly at her face.
BZZZZ-CRACK.
The acoustic pulse overloaded the audio-visual sync circuits in Sorsha's goggles.
A burst of sparks exploded against her temples. Sorsha shrieked, clutching her face as her balance failed, her boots slipping on the slick steel cable. She tipped backward over the edge, hanging by a single magnetic tether over the molten chasm.
Her two companions hesitated, their weapons wavering.
"Pull your leader up," Idris commanded, stepping forward, his dart thrower locked on the nearest guard. "Or I cut the tether and let the lake have her."
Five minutes later, Sorsha was hauled back onto the cable, her face pale, the burned goggles dangling around her neck.
She stared at Idris with a mixture of terror and furious respect. "You're Calder. The one who dropped the Chime Tower on Graven's command crawler."
"Take us to the Spire's primary control deck," Idris said, not lowering his weapon. "And maybe I won't fry the rest of your cybernetics."
Sorsha spat onto the cable, nodding grudgingly. "Follow the main trunk line. The airlock is at Pylon Four."
They crossed the remaining cable and slipped through a pressurized hatch into the interior of the Hanging Spire.
The architecture was entirely different from the crude stone caverns of Oakhaven. Here, the walls were made of polished, non-magnetic white composite panels, illuminated by glowing floor strips of blue electroluminescence. It was an ancient high-tier research facility, built by the Old Republic before the tectonic fracture.
In the center of the Spire's rotunda stood a circular console surrounded by dead holographic projectors.
A synthetic voice, distorted by centuries of decay, resonated from the ceiling:
PRIMARY ANOMALY DETECTED. BIOLOGICAL SIGNATURE MATCH: RESIDUAL VESSEL THREE.
Vespera walked toward the central console without prompting.
She reached out and placed her right collarbone socket flat against a hexagonal bronze indentation in the terminal surface.
Hummmmm.
The blue floor strips flared into blinding gold. The dead holographic projectors whirred to life, casting dozens of floating architectural schematics into the air.
In the center of the rotunda, a three-dimensional hologram flickered into existence: an old man with sharp features and a high-collared laboratory coat.
"Greetings, Vessel Three," the hologram spoke, its voice crisp and recorded. "I am Chief Architect Valen. If this archive has resumed operation, the orbital frequency has degraded to terminal velocity, and the Resonant Engine has entered its final awakening cycle."
Architect Valen's holographic image flickered, its lines of light warping in the rising heat of the shaft.
"The Resonant Engine was engineered during the First Cycle," the recording continued. "Its purpose was simple: to stabilize the planetary mantle against cosmic gravitational shear. But the machine is not purely mechanical. It requires a biological harmonizer to translate the mantle's shifts into corrective acoustic chords."
A glowing schematic appeared in the center of the rotunda, showing three interlocking symbols:
"Three components are mandatory for recalibration:
First: The Biological Catalyst—Vessel Three, carrying the core gene sequence.
Second: The Neural Conductor—a cranial titanium bracket tuned to forty-two hertz, capable of absorbing harmonic recoil.
Third: The Reagent of Stasis—a stabilized cryogenic compound to prevent thermal meltdown during the interface."
The terminal emitted a low, electronic chime:
COMPONENT ONE: DETECTED. COMPONENT TWO: DETECTED. COMPONENT THREE: MISSING.
Idris stepped forward. From his inner coat pocket, he pulled the heavy glass vial of iridescent blue fluid he had taken from the cryo-locker on the tungsten barge during their descent through the magma rift.
He slid the vial into the console's auxiliary receiver.
Click-shhh.
The stasis fluid drained into the terminal with a soft hydraulic hiss.
COMPONENT THREE: ACCEPTED. SYSTEM SYNCHRONIZATION: NINETY-TWO PERCENT.
Before Idris could breathe, the floor beneath his boots gave a sickening, violent lurch.
A deafening metallic groan shrieked through the Spire's bulkheads, followed by the blare of a crimson klaxon:
WARNING: EXTERNAL CABLE ONE SEVERED. STRUCTURAL INTEGRITY COMPROMISED.