Chapter Text
It was a warm June afternoon, and sunlight streamed into the Headmistress’s office at Hogwarts. Minerva McGonagall sat at her desk, her sharp eyes scanning a letter delivered moments ago by a Ministry owl. The bird still perched on the back of a high-backed chair, preening itself and casting a faintly disapproving look at the clutter on Minerva’s desk. Scrolls and correspondence lay in untidy heaps, the result of a term about to end and the Headmistress’s ever-expanding duties.
She sighed, adjusted her spectacles, and reread the letter.
Ministry of Magic: Department of Magical Infrastructure
Re: Approved Labourers for Hogwarts Reconstruction Effort
Dear Headmistress McGonagall,
We are pleased to inform you that your request for Ministry assistance has been approved under the War Reparations Fund. A team of licensed witches and wizards has been secured and will arrive promptly on the 1st of July to begin the clearing of the collapsed dungeon corridor.
Please do not hesitate to contact us should the project require further support.
Sincerely,
Percival Larchmont
Deputy Head, Magical Reconstruction Committee
Minerva folded the letter carefully and placed it on her desk. It had been nearly fifteen years since the war, and though Hogwarts had been restored to its former glory in most respects, certain corners of the castle remained untouched. The dungeons, in particular, bore the brunt of the final battle’s chaos, with sections caved in or blocked by unstable magical debris. Minerva had made several unsuccessful requests for funding over the years, and it was only now—after the persistence of one Golden Trio, no doubt—that the Ministry had finally seen fit to act.
“About time,” she muttered under her breath, rising from her chair to open the window for the owl. It hooted reproachfully and took off, wings glinting in the sunlight. Minerva watched it disappear over the treetops of the Forbidden Forest before returning to her desk, her thoughts already turning to the impending project.
The dungeon corridor was dark and uncomfortably warm, even with the charms the team had cast to circulate the air. Flickering lanterns hung from hooks along the crumbling walls, casting shifting shadows over the cracked flagstones and the heaps of rubble still waiting to be cleared. The magical debris that littered the space had an oppressive quality, humming faintly in the air like an ancient tune just out of earshot.
A witch with a bright pink headscarf stood with a hand on her hip, wand pointed lazily at a pile of bricks that were now floating across the room in a neat formation. “Oi, Dags, shift over before I drop these on your bloody foot,” she said, not bothering to mask her annoyance.
“Yeah, yeah,” replied a wiry wizard crouched near the edge of the rubble, his accent thick and his words half-mumbled around the lit cigarette hanging from the corner of his mouth. He leaned back on his heels and exhaled a cloud of smoke, his wand tucked behind his ear. “Bet you couldn’t hit me if you tried, Sylvie.”
Sylvie smirked and made a quick, sharp motion with her wand. The floating bricks lurched dangerously to one side, prompting Dags to leap out of the way with a string of curses.
“Oi, you tryin’ to kill me?” he barked, scrambling to his feet and brushing dust from his worn robes. “I don’t get hazard pay for you lot, do I?”
“If that’s hazard pay,” muttered another labourer, a stocky wizard adjusting his sleeves, “you’re already robbin’ the Ministry blind.”
The group chuckled, the sound echoing oddly in the confined space. Hogwarts had been a decent enough gig. The place was quiet, the castle’s ghosts stayed out of their way, and the Headmistress had sent down tea and sandwiches more than once. But the oppressive magic in this particular corridor made the hairs on the back of their necks prickle.
Most of them had been at this game long enough to know trouble when they saw it.
“Place gives me the right creeps,” said the stocky wizard, muttering as he Vanished a pile of rubble. “Can feel it under my skin. Like the walls are watching.”
“It’s just Hogwarts,” Sylvie replied, flicking her wand again. “Place is always buzzing, innit? I’d be more worried if it weren’t.”
Dags snorted and pointed his cigarette toward the far corner of the room, where an older wizard was carefully dismantling a particularly stubborn section of wall. “Oi, Mal, you wanna tell her that when the bricks start screamin’?”
The older wizard, tall and gaunt with a patchy grey beard, didn’t look up. “You lot can joke all you like,” he said in a gravelly voice, “but this section’s been shut up longer than you’ve been alive. Keep sharp.”
Sylvie rolled her eyes but said nothing, focusing instead on shifting the next set of debris into an ever-growing pile near the corridor’s entrance. The work continued in fits and starts, their conversation punctuated by the scrape of stone and the occasional crackle of unstable magic.
“Bet it was some student,” Dags said after a while, leaning lazily against the wall. “Blowing stuff up down here. Probably what caused all this.”
Sylvie laughed. “What, you think some kid collapsed the whole corridor? No way. This is old magic, this is. Reckon it happened during the war.”
“Everything happened during the war,” grumbled Mal from the corner. “Now stop leaning about and do some bloody work.”
Before Dags could retort, a flash of green light erupted from the far end of the corridor, accompanied by a deafening crack. The explosion sent dust and stone flying, and the air grew thick with the acrid tang of raw magic. Sylvie was the first to react, ducking behind a column and shielding her face.
“Oi, Harvey!” she yelled, coughing as she peered through the haze. “Harvey, you all right?”
The youngest member of the crew, Harvey, was sprawled across the floor, unconscious and covered in a thin layer of dust. A broken lantern lay shattered beside him, its glass shards glinting in the low light.
“Merlin’s bloody beard,” Mal muttered, rushing to Harvey’s side. He pressed two fingers to the boy’s neck, relief flashing across his face when he found a pulse. “Knocked cold. Sylvie, get him out of here.”
Sylvie flicked her wand and muttered an incantation, levitating Harvey’s limp form carefully toward the corridor’s entrance. The others crowded around the source of the explosion, where the rubble had cleared to reveal a gleaming, dark surface embedded in the wall.
“What in the hell…” Dags murmured, stepping forward despite the residual crackle of magic. The surface was smooth and polished like obsidian, carved with serpentine patterns that seemed to shift under the flickering lantern light. A faint inscription, written in looping, unfamiliar script, glowed faintly along the top.
“That’s a door,” Sylvie said, rejoining the group with her arms crossed. “A proper magical one, by the looks of it.”
“A cursed one,” Mal corrected, his gravelly voice low. “And I’m not touching it.”
The others nodded in agreement, taking several cautious steps back. The magical hum in the air seemed to intensify, pressing against their skin like an unwelcome touch. Dags ran a hand through his hair, looking uneasy for the first time.
“Right,” he said finally. “Looks like we’re out of our depth, then.”
Sylvie smirked. “You don’t say.”
The dungeon entrance was dimly lit, the air heavy with the metallic tang of raw magic. Harry Potter stepped inside, his boots scuffing softly against the flagstones as he adjusted his wand in his grip. He hadn’t seen Hogwarts in years. Despite the warmth of the July afternoon, the dungeons were cool, the oppressive hum of residual magic pressing against his skin as he descended.
Near the entrance to the blocked corridor, Draco Malfoy leaned against a cracked stone pillar, his arms crossed. His immaculate Auror robes somehow remained spotless, his silver eyes glinting in the lantern light.
“You’re late, Potter,” Malfoy drawled, straightening as Harry approached. “Taking your time with your Ministry tea and biscuits, were you?”
“Nice to see you too, Malfoy,” Harry replied, his voice dry. “I figured you’d have the situation under control by now. Or is delegating rubble-clearing too complicated for you?”
Malfoy smirked faintly, his sharp features giving him an air of practiced indifference. “Charming as ever. Perhaps you can remind me why I bother working with you.”
Despite the sharpness of their words, there was no real heat in the exchange. The years since the war had softened the edges of their old enmity, though not enough to shift their default tone from one of mutual antagonism.
Harry had returned to Hogwarts only once after the war—to bury his dead. Then he had thrown himself into becoming an Auror, determined to protect a world he had nearly died for. Now, only fifteen years later, his messy black hair was still as rumpled as ever, and his green eyes remained as bright and alert as they had been at the height of the war.
Malfoy, by contrast, had stepped back into public life with cautious determination. Exonerated by Harry’s testimony at his trial, he had surprised everyone—including Harry—by joining the Auror training program. Fifteen years of hard work had forged him into one of the department’s most methodical minds, though his sharp tongue and aristocratic demeanor still grated on some of his colleagues.
“Right,” Malfoy said briskly, turning toward the foreman waiting near the entrance to the collapsed corridor. “Let’s see what mess you’ve dragged us into, shall we?”
Mal, the wiry foreman, stepped forward, his lined face creased with irritation. He gestured toward the sealed corridor, where faint green light glowed from the edges of the rubble.
“We were clearing the last bit of debris when that thing showed up,” Mal said, his gravelly voice tinged with unease. “Smooth as glass, with snakes all over it. One of my men touched it, and there was an explosion—sent him flying.”
Harry frowned. “How’s the worker? Harvey, was it?”
“Alive,” Mal replied. “But out cold. Sent him up to the hospital wing for observation. Rest of us got out as fast as we could and sealed the corridor.”
Malfoy stepped closer to inspect the corridor’s entrance, his silver eyes narrowing. “And the door?”
“Still glowing. Magic’s buzzing all over the place, like it’s alive. I’m telling you, sirs, this isn’t just Dark magic. It’s ancient.”
Harry and Malfoy exchanged a glance.
“Good call on retreating,” Harry said finally. “You and your team can go. We’ll handle it from here.”
Mal nodded briskly, clearly relieved, and motioned for his workers to follow him. The group disappeared down the passage, their footsteps fading into the distance.
The moment Harry stepped into the blocked corridor, the magic pressed against him like a living thing, vibrating faintly under his skin. Dust hung in the air, illuminated by the flickering lanterns still hooked along the walls.
Malfoy followed close behind, his steps deliberate and quiet.
“This place feels wrong,” Malfoy muttered. “Like it’s been waiting for someone to open it. Nothing quite like unstable ancient magic to ruin a perfectly good afternoon.”
Harry shot him a look. “It’s not like you had anything better to do.”
Draco smirked. “True. It’s either this or listening to my mother complain about the house elves rearranging the china. I suppose I should thank you for the distraction.”
Harry huffed a laugh but didn’t reply, his attention drawn to the far end of the corridor. There, gleaming like a shard of obsidian in the dim light, was the door.
It was smooth and polished, with serpentine patterns carved in deep, looping lines. The spiky script along the top glowed faintly, shifting like ink under water. There was no doorknob.
“That’s Parseltongue,” Harry said, his voice low.
Draco’s eyes narrowed. “Of course it is. Because nothing involving Slytherin can ever just stay buried, can it?”
Harry stepped closer, ignoring Draco’s remark as he studied the carvings. The runes tugged at the edge of his memory, familiar yet unreadable.
“It’s like the Chamber of Secrets,” Harry murmured, his brow furrowing. “The same kind of magic.”
“Brilliant,” Draco said dryly. “Because that went so well the last time.”
Harry ignored him, taking a deep breath before hissing a command in Parseltongue. The sound was unnatural, slithering through the air like an invisible serpent.
The door groaned in response, the serpentine carvings coiling and uncoiling as the polished surface began to shift. Dust fell from the ceiling as the room trembled, and a faint, acrid tang of raw magic filled the air.
Beyond was a pristine chamber, untouched by time. Brewing stations lined the walls, their cauldrons gleaming under enchanted lights. Shelves were stacked with vials of preserved potions, their colors glowing faintly in the low light.
“It’s a potions lab,” Harry murmured in surprise, stepping inside.
Malfoy followed, his expression darkening. “Not just any lab. This place reeks of Salazar Slytherin’s handiwork.”
Harry nodded. “We’ll need experts for this. Someone who might be able to make sense of ancient potioncraft.”
Malfoy snorted. “And curses. This place feels like it’s waiting to kill someone.”
Harry glanced at him. “Hermione can handle it. If anyone can make sense of this, it’s her.”
Draco rolled his eyes. “Of course. Call Granger. Because there’s nothing the Golden Girl can’t handle.”
Harry glared at him, but Draco held up a hand.
“I’m not saying she’s not qualified,” Draco said evenly. “But if you want this done right, you’ll need Snape. He’s not just brilliant—he understands how dangerous this kind of magic is. And this…” He gestured to the room. “This is exactly his specialty.”
Harry crossed his arms, his green eyes narrowing. “Snape’s reclusive. I’m not even sure he’ll respond now that school’s out. Hermione’s not just brilliant—she’s the Ministry’s top potions expert. She’s perfect for this.”
Malfoy’s voice sharpened. “And what happens when it’s not just about potions, Potter? When it’s about Slytherin’s twisted mind? Granger might be clever, but Hermione’s brilliant, but she’s a Gryffindor and she doesn’t have Snape’s instincts. You know that as well as I do.”
Harry hesitated, the weight of Malfoy’s words settling over him. For all his arrogance, Malfoy wasn’t wrong.
“Fine,” Harry said finally. “I’ll talk to Hermione. You talk to Snape. We’ll meet back here tomorrow.”
Malfoy smirked faintly, his tone laced with amusement. “Gracious as always, Potter.”
Harry ignored him, already heading back toward the entrance to the corridor. Malfoy turned back to the lab, his expression unreadable. Whatever secrets lay hidden within Slytherin’s lab, Harry had no doubt they would demand more than just expertise—they would demand cunning, and perhaps even sacrifice.
The lift doors at the Ministry of Magic slid open with a soft chime, and Harry stepped out into the gleaming corridors of the Department of Magical Innovations. The air here always smelled faintly of brewed herbs and parchment, and the soft hum of enchantments filled the space, blending seamlessly with the murmurs of witches and wizards bustling past.
He turned down a quieter hallway, lined with frosted glass doors bearing the names of senior researchers and department heads. Near the end, the largest door stood slightly ajar, revealing a cozy office packed with neatly organized scrolls, books, and potion vials.
Harry rapped his knuckles against the wood as he stepped inside.
“Hermione?”
At her desk, Hermione Granger glanced up, a quill stilling in her hand. Her hair was pinned back in a loose bun, though a few stubborn curls had escaped to frame her face. She offered him a small smile, her dark brown eyes bright despite the stacks of parchment surrounding her.
“Harry,” she said warmly, setting the quill down. “This is a surprise. What brings you down here? Is everything all right?”
Harry closed the door behind him and crossed the room, slipping into one of the chairs opposite her desk. “Depends on how you feel about cursed Slytherin relics.”
Hermione’s smile faded, replaced by a look of wary curiosity. “What sort of relics?”
“We found a potions lab,” Harry explained. “Sealed behind a door in one of Hogwarts’ collapsed dungeon corridors. The runes on the door were Parseltongue, and the magic inside—” He shook his head. “It feels ancient. Dangerous.”
Hermione’s expression shifted from curiosity to intrigue. “A potions lab? At Hogwarts? Untouched since…?”
Harry shrugged. “Could be centuries. Could be Slytherin himself.”
Hermione leaned back in her chair, her fingers steepled under her chin. “And you want me to take a look.”
“You’re the Ministry’s top expert,” Harry said. “If anyone can figure out what’s in there—and whether it’s a threat—it’s you.”
For a moment, Hermione didn’t respond, her gaze distant as she processed the information. Then she nodded, her expression resolute.
“All right,” she said. “When do we leave?”
Harry hesitated, glancing at her desk. “I thought you might argue about taking time away from all this.”
Hermione smiled faintly. “You wouldn’t be here unless it was important. Besides…” She gestured to the parchment in front of her. “It’s just departmental budgets. They’ll survive without me for a day or two.”
Relieved, Harry rose from his seat. “Thank you, Hermione. We’re meeting at the site tomorrow morning. And… fair warning, Malfoy’s also involved.”
Hermione arched a brow but said nothing, her expression carefully neutral.
“I’ll see you there,” she said finally.
Harry nodded and turned to leave, though her voice stopped him at the door.
“Harry.”
He glanced back.
“Does Malfoy think it’s dangerous enough to bring in Snape?”
Harry’s brow furrowed. “He does. He’s contacting Snape now. Why?”
Hermione’s lips twitched, though whether it was amusement or irritation, Harry couldn’t tell.
“No reason. Just wondering how much of my work will involve managing egos.”
Malfoy stood outside the modest cottage on the outskirts of Hogsmeade, his hand hovering near the brass knocker shaped like a serpent coiled around a rose. The structure was small, almost unassuming, with ivy creeping up the stone walls and a neatly tended garden brimming with medicinal herbs. A single light glowed from within, casting faint shadows across the front step.
Draco hesitated for a moment, the crisp evening air cool against his skin. It wasn’t that he feared Severus Snape—far from it. But over the years, he’d come to recognize that interrupting the man’s peace was never without consequences. With a resigned sigh, Draco rapped twice on the door, the sound sharp against the quiet of the village.
The door opened with a quiet creak, revealing Severus Snape, his dark robes as immaculate as ever, his black eyes narrowing at the sight of his unexpected visitor.
“Malfoy,” Snape said, his voice low and unimpressed. “To what do I owe the dubious pleasure?”
Draco smirked faintly. “Good evening to you too, sir. May I come in?”
Snape stepped aside without a word, gesturing curtly for Draco to enter. The cottage’s interior was small but tidy, its austerity softened by the warmth of the fire crackling in the hearth. Bookshelves lined the walls, crammed with texts on potions, ancient magic, and obscure magical theory. A single armchair sat by the fire, beside a small table piled with open books and a steaming teacup.
“You’ve done well for yourself,” Draco remarked, his tone light as he surveyed the space. “Cozy.”
Snape ignored the comment, closing the door behind him. “I assume you’re not here to admire my decorating skills. Sit.”
Draco sat in the straight-backed chair Snape gestured toward, taking in the man before him. Snape looked much the same as he always had—his sharp features framed by shoulder-length black hair streaked with silver, his posture as rigid as ever. Yet there was a subtle change in him, something quieter, less coiled.
Since the war, Snape had carved out a life for himself here in Hogsmeade, far removed from the chaos of Hogwarts’ hallowed halls. He had refused Minerva McGonagall’s repeated requests to return to full-time teaching, agreeing only to take on NEWT-level Potions classes. He had no patience left for fumbling first years or the exhausting politics of running a school. Instead, he spent his days on research and enjoying the solitude his small cottage offered.
Draco, who had once feared his former professor’s sharp tongue more than his own father’s wrath, found himself almost envious of the man’s ability to step away from it all.
“I’ll get to the point,” Draco said, leaning forward slightly. “We found something at Hogwarts. A potions lab, sealed behind a Parseltongue door in the collapsed dungeons.”
Snape’s brows lifted slightly, though his expression remained impassive. “Go on.”
Draco’s tone shifted, growing more serious. “It’s untouched—pristine, like it’s been waiting for centuries. Brewing stations, preserved potions, ancient scripts… But the magic in the air is oppressive. Dangerous.”
Snape regarded him with a piercing gaze, his long fingers curling lightly around the arm of his chair. “And what, exactly, do you expect me to do about it?”
Draco smirked faintly. “Come take a look. Potter and Granger will be there—”
“Ah,” Snape interrupted, his tone turning icy. “Potter and Granger. I see. Let me guess: Potter, in his infinite wisdom, opened the door, and Granger is now expected to solve the puzzle?”
“More or less,” Draco admitted, the smirk lingering. “But we both know Granger’s strengths and limitations. She’s brilliant, but she doesn’t have your instincts. And Potter insisted on her.”
Snape’s lip curled faintly. “Of course he did.”
Draco leaned back, his smirk fading. “Look, I’m not saying Granger can’t handle it. But this place…” He gestured vaguely, his words hanging in the air. “It feels alive. If we’re walking into a trap, I’d rather have the one person who’s faced worse and lived to tell the tale.”
For a long moment, Snape said nothing. His gaze shifted to the fire, the flames reflecting faintly in his dark eyes.
He had made his peace with Hogwarts long ago, agreeing to teach on his own terms and only when absolutely necessary. His small circle of students—those who could tolerate his exacting standards and occasional acerbic remarks—were promising enough to keep his interest, but even that didn’t require much of him these days. The rest of his time was spent brewing and researching, pursuits that kept his mind sharp without dragging him back into the chaos of the past.
And yet, the idea of Slytherin’s work, untouched and waiting…
With a soft sigh, Snape crossed to the small counter where he poured himself another cup of tea. He didn’t look at Draco as he spoke.
“If this proves to be yet another waste of my time, Malfoy, you’ll regret it.”
Draco grinned faintly, rising from his seat. “I wouldn’t expect anything less. Tomorrow morning, then?”
Snape turned, his expression unreadable. “Fine. But do not expect me to endure Potter’s incompetence without comment.”
Draco chuckled softly as he made his way to the door. “Somehow, I think Potter’s already prepared for that.”
As the door clicked shut behind Draco, Snape allowed himself a brief moment of quiet reflection. Whatever lay hidden in the depths of Hogwarts, he had little doubt it would demand more than anyone was prepared to give.
The dungeon corridor felt colder than it had the day before, the magic radiating from the sealed lab humming steadily like an unrelenting heartbeat. Harry was already there, pacing near the gleaming black door with his hands clasped behind his back. His green eyes were sharp, his jaw tight. Despite the years, he still wore his emotions plainly, and today, they were etched into every line of his face.
The sound of boots against stone drew his attention, and he turned to see Malfoy striding down the corridor. His black Auror robes flared faintly as he walked, his expression cool and composed, though the corner of his mouth curled upward as he caught Harry’s gaze.
“Potter,” Malfoy said by way of greeting, his tone sharp but not unkind. “Surprised to see you on time for once.”
“Malfoy,” Harry replied evenly, crossing his arms. “Surprised you didn’t bring a fanfare. Or a mirror to admire yourself in.”
Malfoy’s smirk widened as he came to a stop a few feet away. “You know, I’d almost forgotten how charming you are in the mornings. Almost.”
Before Harry could reply, the sound of a second set of footsteps echoed down the corridor. Both men turned as Hermione appeared, her figure backlit by the faint lantern glow. She wore simple, practical robes, her wand in one hand and a satchel slung over her shoulder.
“Harry,” Hermione greeted, her tone warm as she approached him. Her expression shifted as her gaze flicked to Malfoy. “Malfoy.”
“Granger,” Malfoy replied smoothly, the smirk never leaving his face. “I see you’re still lugging half a library around. Can’t imagine why Potter needed you here—surely you’ve published something on this already?”
Hermione’s lips thinned, but she didn’t rise to the bait. “Good to see you haven’t lost your gift for unnecessary commentary. It must make your field reports riveting reading.”
Harry cleared his throat, glancing between them. “Enough. We’ve got work to do.”
“I assume your expert will be joining us?” Hermione asked, brushing past Malfoy and inspecting the door with sharp eyes.
Malfoy opened his mouth, but another voice—low and drawling—cut through the corridor.
“Miss Granger,” Snape said, his voice carrying easily over the hum of magic.
The three turned as Snape emerged from the shadows near the far end of the corridor, his black robes sweeping behind him. He looked much the same as he always had—pale, sharp-featured, his dark eyes gleaming with something between disdain and amusement.
“You’ve yet to lose your flair for theatrics,” Harry muttered under his breath, earning himself a withering glance.
Snape’s attention, however, remained on Hermione. His lip curled faintly. “A potions expert. How refreshing.”
Hermione straightened, meeting his gaze without flinching. “And you’re here because…?”
“Malfoy,” Snape said smoothly, inclining his head toward his former student. “Unlike some, he seems to recognize the necessity of experience over… enthusiasm.”
Hermione opened her mouth, but Harry stepped forward, his frustration bubbling to the surface. “Right. That’s enough. We’re all here because we’re the best at what we do—or so I’ve been told. Let’s keep this professional.”
Snape’s eyebrow arched, his lip curling further. “Potter, I’m impressed. Such optimism in the face of inevitable disaster.”
Harry bit back a retort, his patience already fraying.
Malfoy, who had watched the exchange with mild amusement, stepped forward. “As entertaining as this is, perhaps we could focus on the giant cursed door radiating ancient magic?”
Snape moved past them, his dark eyes sweeping over the door with practiced precision. His expression tightened slightly as he extended a hand toward the surface, stopping just shy of touching it.
“It’s layered,” he murmured. “Not just Parseltongue. There’s blood magic here, woven in with preservation spells.”
Hermione frowned, stepping closer. “Blood magic? Are you certain?”
Snape turned his head slightly, his gaze cutting. “I don’t deal in uncertainties, Miss Granger.”
Hermione bristled, her hand tightening on her wand. “And yet, you seem to have no issue casting aspersions before offering actual solutions. If you’d rather leave, feel free.”
Snape’s black eyes narrowed, his lip curling into a faint sneer. “The moment you exceed my expertise, Miss Granger, I’ll happily bow out. Until then, perhaps you could restrain your habitual need to debate matters beyond your comprehension.”
“Enough,” Harry snapped, stepping between them. His green eyes flashed as he looked between Hermione and Snape. “I didn’t bring you both here to argue. We’ve got a job to do, and we’re not getting anywhere if we can’t work together.”
Snape’s gaze lingered on Harry for a long moment before he turned back toward the door, his expression unreadable. Hermione, her jaw tight, gave Harry a curt nod before stepping back.
Harry turned to the sealed lab. The serpentine carvings on the black door gleamed faintly, the Parseltongue inscription pulsing in a slow, steady rhythm. Taking a deep breath, he raised his lit wand and hissed the command word again.
The air thickened as the carvings shifted, coiling and rippling like living snakes. With a deep groan, the door began to fold in on itself, revealing the chamber beyond.
The lab was exactly as they had left it: rows of brewing stations, shelves lined with ancient vials, and the faint glow of enchanted lights casting long shadows over the pristine space. The oppressive hum of magic pressed against their skin as they stepped inside.
Snape moved past Harry without a word, his wand raised as his sharp gaze swept across the room.
“Preservation charms are stable,” he said finally. “The magical residue suggests defensive measures, but nothing reactive here.”
Hermione stepped further into the room, her own wand lit. “The air’s breathable. No sign of immediate threat.”
“You’re welcome,” Harry muttered under his breath, earning himself a faint smirk from Malfoy, who lingered near the entrance.
Hermione’s attention drifted to the rows of vials, her brow furrowing. “Some of these potions are glowing—they’re still active. If Slytherin created these…” She trailed off, her voice tinged with both awe and concern.
“Then we’re dealing with volatile material,” Snape said flatly, his gaze moving to one of the brewing stations. “This isn’t merely a historical curiosity. There’s purpose in this design. Something specific was meant to be done here.”
“Or hidden,” Malfoy remarked, his voice quiet but edged.
Harry nodded, his eyes scanning the shelves. “We’ll need to document everything. Hermione, can you—”
“I’m not your assistant, Harry,” Hermione said sharply, turning toward him. “We’ll need containment protocols, magical stabilization spells, and a proper cataloguing system before we so much as touch anything.”
Snape’s lip twitched, though whether it was amusement or irritation, Harry couldn’t tell. “For once, I agree with Miss Granger,” he said smoothly. “Anything less would be reckless—though I would expect no less from you, Potter.”
Harry’s jaw tightened, but before he could respond, the oppressive hum of magic shifted.
It was subtle at first, like the faintest vibration in the air, but then the lights in the chamber flickered. The glow from the enchanted vials grew brighter, casting eerie shadows along the walls.
Malfoy straightened, his wand already in hand. “Did anyone touch anything?”
“No,” Hermione said quickly, her eyes darting to the brewing stations. “It’s the room. Something’s changing.”
Snape’s voice cut through the tension, calm but cold. “The room’s reacting to us. It’s likely a failsafe—an indication that we’re overstaying our welcome.”
Harry stepped closer to the center of the chamber, his wand gripped tightly. “Can we stop it?”
“We don’t yet know what ‘it’ is,” Snape replied. “But I suggest we find out quickly. Miss Granger, with me.”
Hermione hesitated but followed Snape toward the brewing stations, her wand still raised. Malfoy lingered near the entrance, his eyes fixed on the flickering lights.
“This doesn’t feel right,” Malfoy muttered, glancing toward Harry.
“It doesn’t feel dangerous,” Harry replied, though the unease in his voice betrayed him.
The hum of magic intensified, a low, resonant pulse that seemed to emanate from the very walls. The flickering lights steadied, casting the room in an unnatural green glow.
“Potter,” Snape said sharply, his gaze snapping toward him. “The door.”
Harry turned back toward the entrance, but the black surface was already shifting, the serpentine carvings coiling into new patterns. The Parseltongue runes began to pulse faster, their glow growing brighter as the door began to close.
“Get out,” Snape commanded, his voice sharp and final. “Now.”
Draco muttered something under his breath but stepped out, pulling Harry with him as the heavy black door began to shudder.
Hermione turned to follow, but the hum of magic surged suddenly, and the door slammed shut with a resounding boom.
Snape and Hermione froze, the air in the room thickening as the serpentine carvings on the door flared brightly and then dimmed. The magic settled into an oppressive silence, leaving the two of them alone.
“Well,” Hermione said after a beat, her voice tight. “That’s inconvenient.”
Snape’s gaze lingered on the door, his lips pressed into a thin line. “You could say that.”
From the other side of the door, they heard Draco’s muffled voice. “Potter, tell me you didn’t break it.”
“I didn’t break it!”
Snape let out a low, irritated sigh and turned back to Hermione. “It appears we’re trapped.”
Hermione exhaled slowly, her wand still raised as her eyes scanned the room. “Then we’d better figure out why. It’s possible the lab is designed to lock anyone inside until certain conditions are met.”
“Brilliant deduction, Miss Granger,” Snape drawled. “Ten points to Gryffindor. Perhaps the door will also ask us to solve a riddle or two.”
Hermione ignored him, moving toward one of the brewing stations. “If this is a defensive measure, it’s likely tied to the potions or the equipment. We’ll have to catalog everything before we can determine what triggered it.”
Snape watched her for a moment, his expression inscrutable, before moving to one of the shelves. “Then I suggest we begin.”
From the other side of the door, Draco’s voice rang out again, slightly louder this time. “Potter, if they kill each other in there, I’m not writing the report.”
“Shut it, Malfoy!”
Hermione bit back a smile, but Snape caught the faint twitch of her lips. He said nothing, though his gaze lingered for a fraction longer than necessary before he returned to examining the shelf.
“I don’t think this is just a defensive measure,” she said quietly, her fingers brushing the edge of a workstation. “The room is reacting to us. Whatever this place was designed for, it’s trying to keep us here.”
“Or trying to decide if we’re worthy,” Snape muttered, his voice low as he moved toward another one of the shelves. He raised his wand, his sharp gaze flicking between the vials. “Slytherin was hardly known for his generosity.”
From beyond the sealed door, Harry’s muffled voice broke through the silence. “We’ll get you out! Just… sit tight!”
“Reassuring,” Snape said dryly, his eyes narrowing at the faint glow pulsing from the vials. “No doubt the Chosen One will soon find another brilliant Parseltongue solution to seal us in further.”
Hermione shot him a glare. “Let’s focus on figuring out what triggered the door. Cataloguing these potions is the most logical place to start.”
“And perhaps the quickest way to spring a trap,” Snape countered, though he didn’t stop her as she began arranging her tools.
“Unless you have a better idea?” she asked sharply, arching a brow.
Snape didn’t reply immediately. Instead, he turned back to the shelves, his long fingers brushing the edge of one of the glowing vials.
The air grew heavier as the oppressive magic settled around them. Every sound—the scrape of Hermione’s quill against parchment, the faint crackle of the enchanted torches—seemed amplified in the silence.
“If I had a better idea,” Snape finally said, his voice quiet but cutting, “we wouldn’t still be standing here.”
The glow of the vials seemed to intensify, the magic in the room pressing closer, as if waiting for them to make the first move. Hermione exchanged a brief glance with Snape, their mutual irritation momentarily replaced by something sharper.
Neither of them said it, but the realization was clear.
They were alone in this, and the room was watching.