Theodore spent the next morning teaching Hogwarts volume control.
It was stranger than it sounded.
The castle already knew noise. It had centuries of practice with running children, slamming doors, gossiping portraits, Peeves, exploding cauldrons, Quidditch celebrations, and the particular shriek made by first-years when a staircase moved under them.
What it did not know was how to aim that noise.
The Wuzhuang foundation gave the castle roots.
The nine nails gave it weight.
The dream barriers gave it skin.
Now it needed breath.
Loud in the Great Hall.
Warm in the common rooms.
Sharp but contained in classrooms.
Quiet around Salazar's hidden silence.
Still around the lake.
Theodore stood in an unused corridor before dawn, palm against the wall, while Willow Immortal's roots threaded through stone and old wardwork like a careful musician learning another instrument.
Too much sound toward the lake made the black door stir.
Too little sound made the prisoner hear itself.
Too much quiet near the common rooms made students dream too deeply.
Too much activity near the chamber made Salazar's ancient ward hiss like an insulted snake.
Balance was annoying.
Useful things usually were.
A suit of armor nearby sneezed dust.
Theodore looked at it.
The armor froze.
After a moment, Theodore said, "Again."
The armor hesitated.
Then sneezed.
The sound traveled through the corridor, down the wall, and into the Wuzhuang foundation. It brushed the dungeon layer, softened, and faded before reaching the hidden chamber.
Good.
Theodore marked the pattern.
The armor seemed proud.
"Do not overdo it."
The armor sagged.
Theodore moved on.
By breakfast, the school had shifted without anyone knowing.
The Great Hall sounded the same to ordinary ears, but its noise now flowed downward in braided streams instead of crashing through the foundations. The staircases creaked at better intervals. Portraits near the dungeon corridors muttered less loudly. Peeves tried to sing a rude song near the lower west corridor, opened his mouth, and found himself humming a nursery tune instead.
He was so offended he floated upside down for ten minutes.
Filch considered this the best thing to happen all week.
At the Gryffindor table, Hermione looked up from her porridge.
"Something changed."
Ron immediately looked at his plate. "What? Is it another sandwich?"
"No. The castle."
Harry listened.
At first, he heard only breakfast.
Forks.
Voices.
Laughter.
A shout from the Ravenclaw table.
Then he realized the sounds no longer felt crowded. Yesterday's noise had been lively but rough, like everyone talking in the same room at once. Today it moved in layers.
Like music, almost.
Badly played music, because Hogwarts students were still Hogwarts students.
But music.
Harry glanced at Theodore.
"You did that?"
Theodore buttered toast. "Partly."
Ron narrowed his eyes.
"Can you make the stairs stop moving when I'm late?"
"No."
"Won't or can't?"
"Yes."
Ron pointed at him. "That means won't."
Hermione ignored them.
"If the castle can guide sound, does that mean the seal can be repaired without opening the lock?"
"That is the idea."
"The broken wand is needed?"
"Likely."
Harry frowned. "Dumbledore's ancestor's wand?"
"Yes."
Ron leaned back. "I don't like old family objects. They're never normal."
Harry and Hermione both looked at him.
Ron said, "What? Am I wrong?"
No one answered.
That was enough.
Theodore's leaf talisman warmed lightly.
Not a warning.
A message.
From Dumbledore.
The broken wand had reacted again.
Theodore stood.
Hermione's quill was already in her hand.
"No," Theodore said.
She scowled.
Harry looked disappointed.
Ron looked relieved for half a second, then suspicious of his own relief.
Theodore added, "You three have classes."
Ron brightened. "That's bad, but compared to ancient doors—"
"Pay attention in them."
Ron's face fell. "Worse."
The Headmaster's office felt different when Theodore entered.
Dumbledore had opened the case again.
The broken wand lay inside, pale and cracked. Gray mist rose from it in a thin column, but this time it did not form words. It formed sound.
Not loud.
Barely audible.
Children laughing.
A quill scratching parchment.
Footsteps in a corridor.
Rain against lake water.
Then, under it all, one steady breath.
Dumbledore stood beside the desk, listening.
Fawkes watched from his perch.
The portraits were silent.
Even Phineas Nigellus seemed unwilling to interrupt.
"The wand is remembering the repair?" Theodore asked.
"I believe it is remembering the school before the repair failed."
"Before?"
Dumbledore nodded. "Listen."
Theodore did.
At first, the breath under the sounds seemed like the prisoner.
Then he realized it was too steady.
Too controlled.
Not hunger.
Not dreaming.
A rhythm placed over the dream to guide it.
A lullaby.
No, not exactly.
A spell shaped like a lullaby.
Theodore looked at the wand.
"Aurelius used Hogwarts as an instrument."
Dumbledore's gaze sharpened.
"Can it still be played?"
"Yes."
The gray mist shifted.
A memory opened.
They saw a younger Hogwarts.
Not new.
But younger.
The Great Hall was crowded with students wearing older robes. Candles floated overhead. Laughter rose toward the ceiling. A storm raged outside, but inside the hall, sound gathered in warm layers.
In the memory, Aurelius Dumbledore stood near the back of the hall.
No one looked at him.
He held the unbroken white wand at his side.
His lips moved silently.
The laughter bent.
Not stopping.
Not changing.
Only leaning downward, through stone, toward the hidden lock.
Beside him stood four shadows.
A stern woman with a square jaw.
A thin man with bright eyes.
A broad-shouldered witch laughing into her cup.
And a tall figure in green-lined robes, face half-hidden by candlelight.
Not the founders themselves.
Too late for that.
Successors, perhaps.
Keepers of four house rhythms.
The memory trembled.
Then the scene changed.
The Black Lake at night.
Aurelius stood by the water, bleeding from one eye. The white wand was cracked.
Behind him, someone shouted.
He did not turn.
He pressed the wand against the lake surface.
Sound from the castle flowed down.
Laughter.
Argument.
Study.
Ambition.
Care.
It entered the water, softened, and became a dream the lock could hold.
Then something below pushed back.
Aurelius smiled.
The wand broke.
The memory snapped shut.
Theodore opened his eyes.
Dumbledore was pale.
"That was not just repair," Dumbledore said.
"No."
"He paid for it."
"Yes."
The broken wand clicked once in its case.
A new line formed in gray mist.
The song must be carried by one who can hear all four houses and answer the door without opening it.
Dumbledore read it twice.
Then looked at Theodore.
"No."
Theodore raised an eyebrow.
Dumbledore's voice became firm. "No."
"I have not said anything."
"You were about to think something unreasonable."
"That is difficult to prove."
"I have considerable experience with unreasonable brilliance."
Theodore smiled faintly.
Dumbledore did not smile back.
For once, he looked less like a headmaster and more like a guardian standing before a child and a cliff.
"Theodore, Aurelius broke his wand and perhaps more than that. I will not allow you to step into an old bloodline ritual simply because you can."
"It asks for someone who can hear all four houses."
"Yes."
"And answer the door without opening it."
"Yes."
"That is not necessarily bloodline-specific."
Dumbledore's eyes sharpened. "But the wand is."
Theodore looked at the case.
The wand belonged to Aurelius.
The bloodline connection mattered.
But not in the way the dream wanted.
Blood was a path.
A convenient one.
Not the only one.
The Wuzhuang foundation had already connected to all four houses. Theodore could hear their rhythms through roots, talismans, nail anchors, and the castle itself.
Dumbledore could hear Hogwarts differently. Through office, portraits, phoenix, responsibility, old magic, blood, and love.
Together, perhaps.
Theodore said, "You do not have to allow me."
Dumbledore's expression became dangerous in a very polite way.
"Mr. Snow."
"The castle does."
Fawkes made a soft sound.
Dumbledore looked at the phoenix.
Fawkes was watching Theodore calmly.
That did not help Dumbledore's mood.
Theodore continued, "It cannot be only me. I do not belong to all four houses. I can hear them through the foundation, but I am not the school."
Dumbledore's anger eased slightly.
"You think the repair requires a chorus."
"Yes."
Dumbledore sat down slowly.
"A dangerous one."
"All real repairs are."
"That is not comforting."
"It was not meant to be."
They worked until noon.
By then, the rough shape was clear.
No opening of the lock.
No descent below the lake.
No direct contact with the prisoner.
Instead, Hogwarts would create a controlled dream-song from the four houses, carried through the Wuzhuang foundation, guided by Aurelius's broken wand, and anchored by Dumbledore's blood without letting the dream use him as food.
Theodore would build the structure.
Dumbledore would hold the wand memory.
The houses would provide the living rhythm.
The castle would carry it.
Filch would guard the detention room so Voldemort could not interfere.
Snape would keep Quirrell's thorn active.
And the students would think they were attending a school-wide evening of house activities.
Dumbledore looked at the plan.
"This is absurd."
"Yes."
"It depends on teenagers behaving with lively restraint."
"Yes."
"It also depends on Argus Filch guarding Lord Voldemort in detention."
"Yes."
Dumbledore removed his glasses and rubbed his eyes.
"I miss simple problems."
Theodore looked at him.
"You hired me."
"I am aware."
"That was your last simple problem."
Dumbledore gave him a tired look.
"I deserved that."
At lunch, Theodore explained only the parts the trio needed.
Hermione listened with fierce concentration.
Harry looked tense.
Ron looked as if he had been dragged into homework by destiny.
"So," Ron said slowly, "tonight everyone has to enjoy themselves, but not too much, while secretly helping an ancient seal sleep properly."
"Yes."
"And we can't tell them."
"Yes."
"And if someone starts worshipping Theodore because of the tournament, we stop that."
"Yes."
Ron nodded. "Finally, a rule I like."
Harry glanced at Theodore. "What do we do if something goes wrong?"
"The same thing you usually do."
Hermione frowned. "That is not specific."
"Notice it early. Make noise. Do not panic."
Ron pointed at her. "That means you notice it early."
He pointed at Harry. "You do something brave."
Then he pointed at himself. "I make noise."
Hermione opened her mouth.
Closed it.
"That is unfortunately accurate."
Ron looked pleased.
That evening, Hogwarts prepared to dream louder.
Gryffindor gathered for games, stories, and a suspiciously organized staircase debate rematch.
Ravenclaw held a puzzle and theory night, which became competitive within six minutes.
Hufflepuff filled its common room with food, songs, and a ridiculous amount of warm blankets.
Slytherin continued Snape's potion theory challenge, now with enough attendance that several students pretended they had been forced to come.
The castle filled with four kinds of life.
Theodore stood in the Room of Requirement.
Dumbledore stood beside him, Aurelius's broken wand floating above the table between them.
Willow Immortal spread its roots through the model.
The four house lights glowed.
The lake layer waited.
The detention room held.
Quirrell trembled in his chair.
Voldemort listened, sensing something important but not yet understanding what.
Filch stood outside the detention door, peachwood sword in hand.
Snape sat inside, arms crossed, looking at Quirrell with practiced disdain.
"If you let him use you tonight," Snape said, "I will be personally offended."
Quirrell gave a weak laugh.
The thorn warmed.
Good.
Far below, Gatekeeper opened both eyes.
"Old song," it murmured.
Theodore raised his hand.
Dumbledore lifted the broken wand.
The four house rhythms gathered.
Not as music anyone could hear.
As Hogwarts breathing.
Loud in the right places.
Quiet in the right places.
Alive.
The broken wand trembled.
Aurelius's gray mist rose.
For a moment, an old voice whispered through the room.
"Begin before the prisoner notices the silence."
Theodore's eyes narrowed.
Too late.
Under the Black Lake, behind the black door, the prisoner had already stopped listening to itself.
It was listening upward.
And this time, Hogwarts sang first.
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