It looked unremarkable. No title on the spine, just worn brown leather. But when Rowan pulled it out, it sat in his hand with an odd weight. Not dangerous, just significant, as if it mattered more than it looked.
He opened it.
The pages were filled with a single hand, cramped and hurried, covering every available inch of parchment. A journal rather than a proper book, a collection of notes made by someone who'd been thinking very fast and writing even faster.
The first page bore no name. Just a date. 1473. And a single line:
The vaults beneath the school hold something that must never be opened. I have spent forty years trying to understand what, and I am no closer than when I began.
Rowan turned the page.
The notes were dense, rambling, circling back on themselves. References to "the corruption beneath," to "doors that should not have been built," to "a darkness older than Hogwarts itself." Calculations that seemed to mix runic theory with a discipline Rowan couldn't quite identify.
And then, near the middle of the journal, a passage that stopped him cold:
I have tried every method of analysis available to me. Wards, divination, arithmantic modeling—none of it penetrates the vault doors. The magic beneath is too old, too deep, too fundamentally wrong for conventional approaches.
Perhaps the answer is not in analysis at all. Perhaps it is in riddle.
What has no door, yet bars the way? What holds treasure but refuses to give? What speaks without a voice and guards without hands?
The answer is not the vault itself. The answer is the thing that plays.
Rowan read the passage three times.
The thing that plays.
He didn't understand it yet. The riddle sat in his mind like a stone dropped into water, the ripples spreading outward, disturbing what lay beneath the surface while the bottom remained invisible.
He copied the passage into his journal word for word, then continued reading. The remaining notes grew more erratic, the handwriting deteriorating as though the writer had been increasingly desperate. The journal ended mid-sentence on the final page, the ink trailing off into nothing.
Rowan closed the book and sat for a long time in the quiet of the restricted section, thinking.
The cursed vaults. He'd heard rumors. Every student heard them eventually. Dangerous old magic locked beneath the castle. Most students dismissed it as ghost story material.
This journal suggested otherwise.
But that was a problem for another day. Right now, he had a fungus to grow.
Back in his dormitory, Rowan pulled out Spore's notes and reviewed the cultivation requirements. The fungus required precise conditions: specific soil composition, controlled magical resonance levels, temperature between sixty and sixty-five degrees, and exposure to moonlight for at least four hours per night.
Greenhouse Three at Hogwarts met most of these requirements. The soil beds were rich with magical nutrients, the temperature was maintained by warming charms, and the greenhouse's glass walls allowed moonlight through on clear nights.
But he couldn't just start growing an unknown magical fungus in a school greenhouse without raising questions.
Professor Mirabel Garlick was the obvious person to approach. She ran Greenhouse Three with meticulous care and genuine passion for magical plants, the kind of enthusiasm that lit up her face when she encountered a new specimen.
Rowan found her the next morning after Herbology, lingering in the greenhouse as the other students filed out.
"Professor Garlick, I was wondering if I could speak with you about a research project."
Garlick turned, wiping soil from her hands on her apron. She was a small woman with kind eyes and perpetually dirt-stained fingernails, and she looked genuinely pleased to be asked.
"Of course, Mr. Ashcroft. What sort of project?"
"I acquired a specimen of an unusual magical fungus over the summer. I'd like to study its growth patterns, but I don't have the facilities in my dormitory. I was hoping I might be able to use space in Greenhouse Three."
"A fungus?" Garlick's eyes sharpened with interest. "What species?"
"I'm not entirely certain. I haven't been able to find it catalogued anywhere." Rowan produced the clay pot from his bag carefully. "I bought it from a specialist shop in Diagon Alley. The seller couldn't tell me much about it either."
He lifted the lid just enough for Garlick to see.
The pale blue-white glow pulsed gently in the dim light of the greenhouse. Garlick leaned in, her expression shifting from curiosity to quiet awe.
"Oh," she breathed. "Oh, that's extraordinary. I've never seen bioluminescence like this in a fungal specimen. The magical signature is—" She pulled out her wand instinctively, holding it near the pot without casting, simply feeling the resonance. "Remarkable. Truly remarkable."
Her expression shifted slightly. "Though... there's an unusual quality to the signature. It has dark magical properties. Nothing malicious, but the resonance pattern suggests it draws on darker principles than most flora. Where did you say you acquired this?"
"A specialist shop in Diagon Alley," Rowan said. "The seller mentioned it was rare but didn't say anything about dark magic."
"Dark properties don't necessarily mean dangerous," Garlick said, still examining the fungus with her wand. "Many perfectly legitimate specimens use darker magical principles. But it does mean we'll need proper containment protocols. A warded bed, careful monitoring." She looked up, her enthusiasm returning. "This makes it even more fascinating, actually. Controlled study of dark-principle flora is quite valuable."
"I'd welcome the help, Professor."
"Wonderful." Garlick was already pulling on her work gloves, her attention entirely captured. "Do you have growth specifications? Soil requirements, temperature, light exposure?"
Rowan produced the notes he'd prepared. A carefully edited version of Spore's instructions, stripped of anything that might raise questions about their origin. Just the practical requirements, presented as observations he'd made himself.
Garlick read them with growing enthusiasm. "Moonlight exposure, controlled temperature, high magical saturation in the soil. This is a lunar-cycle dependent organism. Fascinating. We can set it up in bed seven, the one with the best moonlight access."
Over the next week, they worked together to establish the growing conditions. Garlick was meticulous and helpful, adjusting soil composition, monitoring temperature, even enchanting a small mirror to redirect moonlight on cloudy nights. She asked questions constantly. About where Rowan had found the specimen, what he hoped to learn, whether the seller had provided any documentation.
Rowan deflected each one smoothly. The shop in Diagon Alley. A curiosity purchase. No documentation, unfortunately. The seller was informal about paperwork.
Garlick accepted this without suspicion. Her focus was entirely on the fungus itself, which was growing steadily under the conditions they'd established. Within three days, the original specimen had spread across the soil bed, the pale glow intensifying as it fed on the greenhouse's ambient magical energy.
"It's consuming magic at an extraordinary rate," Garlick noted one afternoon, examining the growth with careful measurements. "The magical saturation in this bed has dropped fifteen percent since we planted it. Remarkable metabolic efficiency."
Rowan nodded, making notes. He was watching the growth carefully, checking it against Spore's specifications. The fungus was developing exactly as predicted. Fast, steady, and with increasing potency as it matured.
By the end of the week, it was ready.
His roommates went to bed at their usual times. Hector fell asleep quickly, as always. Lawrence read for another hour before setting down his book. Amit turned out his light without a word. Timothy was already snoring before eleven.
Rowan lay in bed, listening to their breathing settle into the slow rhythms of sleep.
At half past eleven, he sat up.
The stabilizer potion was already brewed. He'd made it over three evenings in his abandoned classroom, following Spore's instructions precisely. Seven ingredients, exact temperatures at each stage, stirred counterclockwise during the cooling phase. The result was a thin, colorless liquid with a faintly sweet smell that he'd stored in a small vial.
The fungus he'd harvested that afternoon, during his last visit to Greenhouse Three. All of it. The entire mycelial network lifted from the soil bed in one careful extraction, because that was what Spore's notes required. One organism, one dose. There was no way to divide it, no way to leave some behind and still have enough. He'd dried the whole specimen and ground it into a fine powder, which he'd stored in a separate vial.
Two vials. That was all it took.
Rowan moved silently to the bathroom attached to the dormitory. He locked the door, cast a silencing charm, and sat down on the cold tile floor with his back against the wall.
He mixed the powder into the stabilizer according to Spore's instructions. Stir once, clockwise, wait thirty seconds for the color to shift from clear to pale amber. It did, exactly on schedule.
He looked at the vial for a long time.
Spore's warning echoed in his mind. The process is painful.
Hecat's voice, too, unbidden. Overconfidence against the wrong opponent could get you killed.
He was asking his own body, his own magical core, to change in a fundamental way. If Spore's notes were wrong, if the stabilizer formula wasn't effective, if the dosage was off, if the fungus had changed in ways she hadn't predicted.
Rowan drank it.
The taste was nothing. Bland, slightly sweet, gone in a single swallow.
For about ten seconds, absolutely nothing happened.
Then his chest caught fire.
It wasn't pain, exactly. Or rather, it was pain, but deeper than muscle or bone. It was his magic itself, the core of it, a part of him he'd never directly felt before, suddenly awake and screaming.
The world went white.