The air in the subterranean corridor was cold, stagnant, and tasted faintly of iron. In this oppressive, lightless void, the only beacon of reality was the pale blue glow emanating from the tip of Allen's wand. It was a fragile circle of safety in a world that hadn't seen the sun in a millennium.
Suddenly, Allen's feet rooted to the spot. Every instinct screamed at him to freeze.
In the periphery of his wandlight, two pinpricks of light reflected back at him. They weren't the warm, amber eyes of a forest creature or the glowing silver of a unicorn. These were oily, pale red, and stared with a flat, unblinking intensity.
The unknown is the ultimate predator. Allen gripped his wand tighter, his mind cycling through every creature in Fantastic Beasts he could recall. Was it territorial? Venomous? Did it hunt by sound or heat? He slowly extended his arm, pushing the Lumos charm further into the dark to reveal the interloper.
The eyes flickered. A white, blurred shape suddenly lunged out of the shadows, running past Allen with a frantic, skittering sound. In its blind panic, the creature collided with a jagged piece of fallen granite, letting out a sharp, wet clicking sound before scrambling into the darkness behind a pile of rubble.
Allen stood still for several long seconds, his heart hammering a frantic rhythm against his ribs. Curiosity, that dangerous trait of the House of Ravenclaw, won over his caution. He moved forward, tracking the faint sounds of clicking and scraping.
He searched the perimeter of the stone ruins until he found it: another circular well, identical to the ones outside but partially obscured by a fallen, moss-covered pillar. A disturbing thought struck him. The creature hadn't vanished; it had gone down.
Allen leaned over the copper railing, casting a wide beam of light into the shaft. Below, he saw a white object moving with terrifying speed. It was roughly the size of a giant sea turtle, but as it paused to look up, Allen felt a cold shiver crawl down his spine.
It was a spider, but its abdomen was a sickly, translucent white, and atop its thorax sat a distorted, fleshy mass that bore a grotesque resemblance to a human face. It stared up at him with beady, lidless eyes before continuing its descent. Only then did Allen notice the architecture of the well wall. Small, black protruding stones had been set into the masonry, forming a crude, vertical ladder leading straight into the abyss.
"It's not just a ventilation shaft," Allen whispered. "It's a highway."
He prepared to follow, but a firm tug on his robes stopped him. Tina and the Niffler were beside him, their agitation palpable. Tina's feathers were puffed out, and she was emitting a low, warning hiss, while the Niffler was trying to pull him away from the ledge. Their animal intuition was screaming that the darkness below was a graveyard.
But Allen was already too far gone into the mystery. He couldn't leave this lead cold. He gently returned the two creatures to his Pet Space, ignoring their mental protests, and vaulted over the well curb.
The descent was a nightmare. Allen realized almost immediately that he had been too impulsive. The black stones were spaced for the multi-legged gait of the Human-Faced Spider, not the heavy, two-legged climb of a human boy. They were slick with condensation and narrow, forcing Allen to cramp his muscles just to maintain a grip.
After climbing down nearly two hundred meters, exhaustion began to set in. His arms felt like lead, and his fingers were raw from clutching the cold stone. Then, disaster struck.
As he shifted his weight, one of the protruding steps groaned and gave way. It crumbled into dust, falling into the bottomless dark. Allen's feet slipped into empty air. For one heart-stopping second, he was falling.
His training saved him. His left hand shot out, catching a jagged edge of rock with a bone-jarring snap. He hung there, dangling over the void, his breath hitching as he listened to the stone step bounce off the walls far, far below until silence reclaimed the shaft.
He didn't move for a long minute, letting the adrenaline clear. Then, with teeth gritted against the soreness in his shoulders, he continued the downward crawl. He considered turning back—climbing up to the safety of the moonlight and forgetting he'd ever found this place. But the thought of climbing up those narrow stones seemed even more exhausting than going down. Besides, Apparition was forbidden on Hogwarts grounds; there was no magical shortcut back to his dormitory.
Finally, his boots hit solid ground. To his right, a narrow opening had been carved into the well wall. Allen squeezed through the gap, his wand held high.
He emerged into a massive, arched cavern. It was so vast that his Lumos couldn't reach the ceiling, making it feel as if he were standing under a sky of solid rock. In the center of the clearing stood a massive stone statue of a Basilisk, its mouth agape in a silent, eternal roar.
The Human-Faced Spider was there, lurking in the deep shadow cast by the statue. The air was thick with the scent of old blood and musk. Scattered around the clearing were the bleached skeletons of small birds and forest beasts—the same types of creatures Allen had seen dead in the forest.
This wasn't just a lair. It was a dining room.
"You're the help, aren't you?" Allen murmured, realization dawning. The Basilisk was the master, too large to hunt small fry, and this spider was its attendant. The spider likely cleaned the kills or guarded the secondary entrances, living off the scraps left behind by the King of Serpents.
The Human-Faced Spider seemed to decide that Allen was either food or an intruder that needed to be erased. It skittered out of the shadows, its eight hooked legs clicking rhythmically on the stone.
Allen didn't wait. "Impedimenta!"
The spell flared, knocking the creature back just as it lunged. Up close, it was even more revolting. The 'face' was a pale, chinless mockery of humanity, with huge, light-red eyes that were filmed over with a grey haze. It looked like a drowned corpse had been fused into a nightmare.
The spider hissed, its mandibles snapping. It opened its mouth and spat a thick, viscous thread of silk directly at Allen's chest.
"Incendio!"
A jet of orange flame erupted from Allen's wand, catching the silk mid-air. The fire raced up the thread toward the spider. The creature was fast; it severed the silk instantly and retreated into the darkness, its pale body vanishing and reappearing like a ghost.
Allen pressed his advantage. He wasn't going to let it escape to warn its master. He tracked the sound of its clicking legs, firing a series of rapid-fire petrification charms. The spider dodged, its multi-jointed legs carrying it up the walls and across the ceiling, but eventually, Allen's aim held true. A bolt of red light caught the creature's thorax, and it tumbled to the floor, frozen mid-scuttle.
Allen approached the petrified monster, his eyes scanning the cavern floor. He found what he was looking for: dark, oily stains on the stone and deep grooves where something incredibly heavy had been dragged. It was Basilisk venom and scale-marks.
His theory was confirmed. This cave system linked the Forbidden Forest to the deep infrastructure of the school. He wasn't in the Chamber of Secrets yet, but he was in the foyer.
He moved deeper into the cavern, following the drag marks. As he walked, the nature of the architecture changed. The rough-hewn rock gave way to smooth, polished obsidian. The air grew warmer, and a faint hum of ancient magic began to vibrate in the soles of his boots.
Suddenly, the space opened up into a grand hall. As if sensing the presence of a wizard's magic, the walls groaned. One by one, ancient magic lamps—fueled by eternal blue flames—flared into life. The darkness was swept away, revealing a chamber of staggering beauty and terror.
At the far end of the hall stood a massive bronze door. It was covered in intricate carvings of serpents, their eyes made of glowing emeralds. Across the center of the door, a series of Ancient Runes had been etched with a master's hand.
Allen stepped closer, his heart thudding in his ears as he translated the jagged script:
"Only Witches and Wizards of pure blood may pass this threshold. Let the unworthy find only their end."