The countdown digits on the wall display blurred into a crimson smear as the first tendrils of gas hissed from hidden vents in the vault’s ceiling. A sharp, chemical tang, like burnt sugar and metal, clawed at Mahesa’s throat. His lungs seized, an involuntary spasm that stole his breath before he could consciously control it. He drew in a ragged, shallow gulp, the air feeling thin and corrosive even before the visible vapor thickened. The numbers on the timer dwindled: forty-five, forty-four. His mind, trained for absolute precision, began a rapid, cold calculation. Air pressure, cubic volume, gas diffusion rate, toxin concentration thresholds. The arithmetic pointed to an unavoidable conclusion. Zero percent. Survival was not an option within the sealed chamber. He watched Banyu. The heir, instead of reacting with panic or even the expected surge of frantic energy, merely sighed, a long, drawn-out sound of pure, unadulterated annoyance. “Seriously?” Banyu grumbled, his voice surprisingly clear through the nascent haze. “More effort? It’s always more effort, isn’t it?” He stretched, a casual movement that made his joints pop, then reached into the tangled knot of his unkempt hair. From somewhere deep within the dark strands, he plucked a slender metal pin. It glinted dully under the emergency lights. Mahesa felt a surge of frustrated incredulity. A brass hair fastener? Against a vault designed to withstand orbital bombardment? His gaze darted to the large, reinforced ventilation fan set high in the far wall, a circular maw of steel blades behind a heavy grating. It was a solid block of plasteel alloys, designed to lock down internally, to prevent anything from entering or exiting. The gas was already stinging Mahesa’s eyes, blurring the edges of his vision. His chest tightened, a desperate urge to cough rising. He clamped his jaw shut, focusing on the grim dignity of his final moments, a solitary, unwavering pillar of duty. Banyu, meanwhile, approached the fan with the slow, deliberate pace of a man inspecting a broken garden gate. He extended the wire, its sharp tip tapping against the grating in a series of precise, almost musical clicks. Then, without warning, his foot lashed out. It wasn’t a wild kick, but a series of utterly controlled, almost imperceptible impacts. Each strike was aimed with terrifying accuracy at specific points along the fan’s housing. The plasteel, supposedly impenetrable, vibrated with a dissonant hum. A faint hairline fracture, invisible to the untrained eye, spiderwebbed from the point of impact. Banyu paused, yawned, then adjusted his stance. Another kick, a light tap, then a sharp, almost balletic snap of his ankle. A section of the heavy grating detached with a faint *thunk*, falling inward rather than outward, swallowed by the darkness behind the fan blades. The vapor's acidic smell intensified, burning Mahesa’s sinuses. His breath came in shallow, wheezing gasps. The numbers on the wall display hit twenty. Banyu was already working on the internal mechanism, his fingers manipulating the brass pin. He seemed to listen to the metal, a whisper of tension in the structure, then delivered another series of precise, almost gentle kicks. The fan blades, each thicker than a man’s forearm, shuddered. A high-pitched whine rose, then a groan of tortured metal. With a final, resonant *crack*, the entire internal assembly of the fan unit collapsed. The large motor housing, a solid mass of steel and wiring, fell away with a tremendous clang, revealing a dark, narrow shaft beyond. Banyu wiped his sooty hands on his trousers, grumbling, “Alright, get in. Don’t dawdle, this stuff smells like burnt ditch-weed.” Mahesa, disoriented by the gas and the sheer impossibility of what he’d just witnessed, stumbled forward. The opening was barely wide enough for one person, a cramped, unlit tunnel reeking of dust and old machinery. Banyu gestured for him to go first. Mahesa, still struggling for air, pushed himself through, scraping his shoulders and knees against the rough metal. The air shaft was pitch black, a suffocating tube of claustrophobia-inducing confinement. He could hear Banyu grunting behind him as he squeezed through, complaining about the dust. They inched forward, Mahesa relying on the faint reverberation of Banyu’s movements behind him. The air grew thicker with dust and the stale scent of forgotten infrastructure. Mahesa focused on the physical discomfort, a brutal anchor against the lingering effects of the neurotoxin. He kept moving, arms extended, pushing against the rough metal, his mind still reeling from the sudden, violent turn of events. After what felt like an eternity, Banyu’s voice, muffled and distant, broke the silence. “Hey, mind giving me a push? Got a bit… stuck. Good spot for a quick nap, though.” Mahesa craned his neck, straining against the confines. Banyu, somehow, had managed to wedge himself crosswise in the shaft, his head lolling to the side, a soft, almost imperceptible snore emanating from him. In the middle of an escape from an airborne toxin, in a filthy shaft, the man had fallen asleep. Mahesa, gritting his teeth, had no choice. He braced his feet against the side of the shaft and shoved Banyu’s boots with all his remaining strength. Banyu let out a soft ‘oof’ and slid forward. Mahesa repeated the process, pushing the heir’s inert form through the cramped tunnel, his own breath ragged, his body aching. Just as Mahesa’s frustration threatened to boil over, the shaft suddenly opened up. A blast of cool, perfumed air hit him, followed by a dizzying rush of sound—laughter, orchestral music, and the drone of an amplified voice. He tumbled out, landing with an undignified thud onto a pristine marble floor. Banyu landed beside him a second later, a soft, cat-like landing that barely disturbed the air. They had dropped from the ceiling, directly into the grand atrium. The same atrium where Banyu had first been introduced, now transformed into a resplendent gala. Hundreds of the city’s elite, clad in shimmering silks and tailored suits, froze mid-sip, mid-conversation. Every eye swiveled to the two figures now sprawled on the floor, covered head to toe in black soot and grime, smelling faintly of chemicals and old ductwork. Raden, standing on a raised dais at the center of the hall, microphone in hand, his perfect smile frozen in place, stared at them. He had been mid-sentence, pontificating on the “unifying spirit of the Suryatama lineage and its enduring legacy of strength.” A large screen behind him displayed a montage of Suryatama family crests and gleaming corporate towers. Banyu pushed himself up, rolling his shoulders with a theatrical groan. He stretched, a long, languid motion that pulled at his soot-stained clothes, then let out a colossal yawn, his jaw cracking. He looked around the hushed, stunned crowd, his gaze finally settling on Raden, who looked as though he’d just swallowed a live scorpion. Banyu, still yawning, raised an arm, his index finger pointing directly at the fake heir. “Alright, pretty boy. Enough of your pretty speeches. I’m tired. Let’s get this over with. I challenge you to the Rite of Succession.” The words, ancient and heavy with a forgotten power, echoed through the suddenly suffocating silence of the atrium. The assembled elite gasped, their perfectly composed faces twisting into expressions of shock and dawning horror. Raden’s eyes, wide and disbelieving, met Banyu’s, and for the first time, a flicker of genuine fear crossed the fake heir’s face.

Ventilation and Vents