The scream from Master Oakes' workbench radio wasn't an isolated report.
Within thirty seconds, the low emergency sirens across Sector 4 began to wail.
It was not the high-pitched electronic klaxon used by Alderman Vance's private police.
This was the heavy, manual steam whistle mounted on the central residential arch.
A sound that hadn't echoed through the district since the Great Subsidence forty years ago.
HOOOOOOOOOOOONK.
HOOOOOOOOOOOONK.
The floor plates beneath Danial's boots vibrated in rhythm with the desperate whistle.
Master Oakes scrambled across his shop, reaching for an old bolt-action hunting rifle hanging above his desk.
"That's the North Gate alarm," Oakes panted, his single eye wide with terror.
"The North Gate connects Sector 4 to the abandon Sub-Level 3 ice shafts."
"Nothing comes down from the ice shafts except wind... and dead air."
"Not anymore," Maya said, her hand tight around her pistol grip as she checked her ammunition clip.
She slapped the magazine into the housing with a sharp, metallic CLICK.
"Danial, if an entropy field is coming down from the surface, those rusted iron barricades at the gate won't hold for two minutes."
Danial did not answer immediately.
He raised his left arm, pulling his dark canvas sleeve up to his elbow.
The Gold Mark was no longer merely glowing in subtle, rhythmic pulses.
The fine golden threads had spiderwebbed past his forearm, glowing with a bright, incandescent hue.
[ALERT: HIGH-DENSITY ENTROPY FIELD DETECTED]
[TEMPERATURE GRADIENT: DROP DETECTED (-0.5°C PER SECOND)]
[QUANTUM DENSITY: 840 PARTICLES/CM³]
[IDENTIFYING SIGNATURE: SELAR SCAVENGER UNIT - CLASS T-2]
[THREAT LEVEL: CRITICAL]
"They aren't just sending a scout," Danial murmured, staring at the translucent HUD overlaying his vision.
"The acoustic ping from Vault 8-B didn't just wake the husks in the salt walls."
"It drew down the surface scavengers that were orbiting in the upper atmosphere."
"They followed the thermal heat leak right down the primary ventilation shaft."
He turned toward the shop door, his heavy coat flaring behind him.
"Oakes, stay here. Keep the shop doors sealed and don't touch the electrical switches."
"If the Selar taste any localized power, they'll siphon this entire block in seconds."
"What about you?" Oakes called out, his voice trembling as he leaned against his workbench.
"You've got a glove that glows, kid, but you're still made of flesh!"
"If that salt mist hits you at fifty below, your lungs will turn to glass!"
Danial paused at the doorway, looking back over his shoulder.
"My lungs survived Sub-Level 8," Danial said softly.
"Let's see if the North Gate can survive me."
The main concourse of Sector 4, which only twenty minutes ago had been a place of celebration, was now in complete hysterics.
The warm steam that had been rising from the newly reactivated radiators was condensing into a thick, eerie white fog.
As Danial and Maya sprinted through the central plaza, they watched the warm steam hit a wall of plummeting air.
The temperature was dropping so fast that moisture was crystallizing mid-air, falling to the iron floor like fine silver rain.
"Clear the avenue!" an enforcer screamed from a mounted guard tower.
"The thermal barrier at Gate 4-N has collapsed!"
"All non-combatants retreat to the lower residential bunkers!"
Citizens were tripping over each other, dragging children and heavy woolen blankets as they scrambled toward the central elevator shafts.
The heat they had just celebrated was being devoured.
The iron walls of the concourse, previously dull gray, were frosting over with terrifying speed.
A thick coat of milky-white frost crept down the steel beams like a living mold, swallowing the warm orange glow of the radiators.
CRACK-CRACK-CRACK.
The sound of iron pipes bursting under intense thermal contraction echoed from the high ceiling.
"Danial!" Maya yelled, pointing toward the end of the avenue.
At the far northern edge of Sector 4, the massive twenty-foot blast doors of North Gate stood closed.
Or rather, they had been closed.
The ten-inch-thick cast-iron doors were now turning brittle, covered in a spiderweb of pure white ice crystals.
Standing in front of the gate was Alderman Vance and twelve of his remaining Joint Governance enforcers.
They were firing their standard-issue heavy carbines at the iron doors.
RAT-TAT-TAT-TAT-TAT!
The muzzle flashes illuminated the freezing fog in bright orange bursts.
"Keep firing, damn you!" Vance screamed from behind his squad, his face pale and covered in a sheet of cold sweat.
"Don't let whatever is on the other side breach the seal!"
"Alderman!" the sergeant yelled, his hands shaking so violently he dropped an ammunition drum onto the frosted floor.
"Bullets aren't doing anything!"
"The door isn't being pushed—it's being dissolved!"
Danial and Maya reached the rear of the enforcer line just as a loud, sickening CRUNCH echoed through the plaza.
The massive center latch of the iron blast door didn't break or snap.
It shattered like cheap glass.
The heavy iron plates of the gate caved inward, collapsing into a heap of frozen gray dust.
Beyond the threshold of the broken gate lay the North Passageway—a long, vertical shaft carved into the rock salt that led directly to the frozen surface.
And floating in the middle of that dark, sub-zero passage was the source of the frost.
It was not a man. It was not a machine in any human sense of the word.
It was a Selar Scavenger Drone.
The entity floated three feet above the ground, completely silent.
Its body was a three-meter-wide ring of matte-black, seamless alloy that seemed to swallow the light around it.
At the center of the ring hovered a sphere of crystalline pale dust—the exact same hexagonal salt-matter Danial had encountered in Vault 8-B.
The sphere was spinning rapidly, creating a localized vacuum that sucked every particle of ambient heat out of the surrounding air.
Around the drone, the air temperature was not merely freezing.
It was dropping toward absolute absolute zero.
-30°C... -40°C... -50°C...
"Fire!" Vance screamed, scrambling backward over the frosted floor plates. "Kill it!"
The twelve enforcers unleashed a wall of lead.
Heavy armor-piercing rounds tore through the freezing fog, traveling directly toward the floating black ring.
What happened next made the enforcers drop their weapons in sheer horror.
The moment the bullets entered the five-meter radius around the drone, they didn't ricochet or hit an iron shield.
The kinetic energy and thermal heat of the flying lead were instantaneously siphoned away.
The bullets stopped dead in mid-air, froze solid, and fell to the ground like tiny drops of hail.
THUD-THUD-THUD-THUD.
"It... it eats kinetic force," the sergeant stammered, backing away slowly as his boots slid on the ice.
"It eats heat!" Maya corrected, stepping past the line of paralyzed guards.
"Any movement, any friction, any heat source—it uses it to feed the thermal vacuum!"
The floating Selar Drone slowly tilted its central core toward the group of humans.
A low, subterranean frequency pulsed from the spinning crystalline sphere.
PING...
The sound vibrated through the teeth and bones of every person present.
It was the same acoustic ping Danial had heard down in Sub-Level 8.
The drone was sending a location ping back to the orbital grid.
[TARGET IDENTIFIED: ORGANIC CONCENTRATION / UNLICENSED THERMAL POWER]
[EXECUTING PURGE PROTOCOL: DRAIN LEVEL 4]
The white salt-dust surrounding the drone expanded violently outward, forming a ten-meter ring of swirling, razor-sharp ice crystals.
The temperature in the North Gate plaza plunged to $-52^\circ\text{C}$ in a fraction of a second.
Two enforcers who were caught in the expanding fringe of the ring didn't even have time to scream.
Their tactical armor instantly turned white with frost.
Their bodies locked up, frozen solid in mid-stride, becoming two perfectly preserved ice statues on the concourse floor.
"Retreat!" Vance shrieked, tripping over his own long coat as he crawled backward toward the inner residential archway.
"Seal the inner bulkheads! Abandon Sector 4 North!"
"If you seal the inner bulkheads, you lock three thousand civilians in the freezing zone!" Maya shouted, raising her weapon even though she knew bullets were useless.
Vance didn't care. He scrambled to his feet and ran like a frightened animal, his enforcers abandoning their positions and fleeing right behind him.
In ten seconds, the entire North Gate concourse was completely deserted.
Except for Maya, the floating Selar Drone... and Danial.
Danial stepped forward, passing the two frozen statues of the enforcers.
The icy wind blowing off the drone whipped his dark canvas coat around his legs.
His skin, exposed to the $-50^\circ\text{C}$ atmosphere, should have turned blue, his breath freezing inside his lungs.
Instead, every breath Danial took was clear, hot, and steady.
Underneath his sleeve, the Gold Mark was burning like a miniature star.
[SYSTEM ANOMALY ENGAGED]
[ACTIVE CAPACITY: THERMAL EQUALIZATION]
[DRAIN RATE MATCHED: 100%]
[ABSORBING SURROUNDING ENTROPY FIELD...]
A faint, golden aura began to radiate from Danial's left arm, extending outward in a three-foot protective shell.
Where the pale white salt-dust of the Selar met the golden light of the Mark, the ice crystals melted mid-air, turning instantly into harmless, warm steam.
The Selar Drone's central sphere spun faster, its acoustic ping growing sharper, more agitated.
PING... PING... PING...
It recognized the anomaly.
It recognized the signature of the ancient Lunar civilization—the same entity that had fought the Selar to a standstill four thousand years ago.
The black alloy ring surrounding the drone shifted.
Four long, needle-like tendrils of black metal uncoiled from the ring, pointing directly at Danial's chest.
"Danial!" Maya called out from behind the cover of an iron pillar. "It's targeting your core!"
"Let it," Danial said quietly.
He took another step forward.
"It feeds on heat."
"It thinks human beings are just fragile bags of warm water to be drained."
Danial raised his left hand, extending his palm toward the floating entity.
The golden runes on his forearm flared brightly, spreading up past his shoulder and onto the left side of his neck.
[LUNAR ARCHIVAL OVERRIDE: AUTHORIZATION LEVEL 1]
[REVERSE THERMAL CONDUCTIVITY: INITIATED]
[TARGET: SELAR SCAVENGER UNIT T-2]
"You want the heat of Sector 4?" Danial whispered, his eyes flashing with a bright, golden light.
"Take it all."
Instead of defending against the thermal vacuum, Danial did something insane.
He opened the floodgates of the Gold Mark, connecting his own internal energy reservoir directly to the Abyss Engine running down in Sub-Level 8.
A massive surge of pure, raw thermal energy was pulled through the floor plates, flowing up through Danial's boots, into his body, and out through his left palm.
A beam of blinding, golden-orange plasma erupted from Danial's hand.
BOOOOOOOOOOOM!
The thermal beam slammed directly into the spinning crystalline core of the Selar Drone.
The drone's thermal vacuum attempted to siphon the incoming energy, spinning furiously as it devoured the heat.
For two seconds, the drone absorbed the thermal beam, its black alloy ring glowing deep purple as it reached its maximum energy capacity.
-50°C... -20°C... 0°C... +100°C... +500°C...
[WARNING: TARGET THERMAL CAPACITY EXCEEDED]
[ENTROPY CORE CRITICAL]
The drone was built to drain cold worlds, to steal heat from dying stars and frozen planets.
It was not designed to hold the unshielded output of an ancient Lunar reactor channeled through a human catalyst.
"It can't vent the back-pressure!" Maya realized, shielding her eyes from the blinding light.
The spinning crystalline core inside the drone turned from pale translucent salt into a bright, white-hot mass of molten slag.
The black alloy ring began to warp and buckle, liquid metal dripping onto the floor plates like red wax.
PING... PING... PING-PING-PING—
The acoustic signal turned into a high-pitched, screeching shriek.
"Danial, drop it!" Maya screamed over the roar of the plasma. "It's going to overload!"
Danial didn't stop. He pushed his arm forward, his teeth grit, his muscles straining against the immense recoil of the reactor link.
"This is for Sector 4," Danial growled.
THUNDER-CLAP!
The Selar Drone exploded.
Not in a cloud of cold ice, but in a blinding wave of pure thermal force.
A shockwave of warm air rushed through the North Gate concourse, instantly shattering every sheet of white frost that had covered the walls.
The frozen statues of the two enforcers thawed in seconds, their armor dripping with harmless water as they collapsed onto the warm floor, gasping frantically for air.
The metallic remains of the drone—twisted, blackened pieces of alloy—clattered harmlessly across the damp iron floor plates.
The temperature in the plaza stabilized instantly.
[SECTOR 4 NORTH GATE: STABILIZED]
[AMBIENT TEMPERATURE: +22°C]
[SYSTEM RECOVERY: 16%]
[NEW LOG DECRYPTED: SELAR SWARM VECTOR]
Danial lowered his left arm.
The golden light slowly faded from his skin, leaving the intricate Mark looking like a dark, metallic tattoo resting beneath his sleeve.
He took a deep, steady breath, exhaling a faint plume of warm steam.
Behind him, the silence of the plaza was absolute.
Slowly, from behind the iron pillars and residential archways, heads began to pop out.
The fleeing enforcers, the terrified citizens, Master Oakes, and finally Alderman Vance himself stood frozen in awe.
They looked at the blackened scrap metal lying on the floor.
They felt the warm, dry air filling their lungs.
And then, they looked at Danial.
Maya stepped out from behind her pillar, walking slowly toward Danial.
She looked down at the melted alloy of the drone, then up at his face.
"That wasn't just a drone, was it?" she asked softly.
"No," Danial replied, his voice low so only she could hear.
"That was a Vanguard scout."
"It was checking if the surface grid was ready for harvesting."
He turned and looked back toward the fleeing Alderman Vance, who was currently staring at Danial with a mixture of terror and profound hatred.
"Vance knows," Maya said quietly. "He knows he can't fight you with enforcers anymore."
"He won't fight me," Danial said, stepping over the scrap metal and walking toward the inner gate.
"He's going to call the High Directorate."
"And when he does, we need to be deeper down in Sub-Level 8 before their dreadnoughts arrive."