Filch liked the idea immediately.
Too much.
"A proper detention room," he said, eyes bright. "No windows. Thick door. Stone floor. Good hooks."
Dumbledore looked at him.
"No hooks, Argus."
Filch's expression fell.
"Small hooks?"
"No."
"Decorative hooks?"
"Still no."
Theodore ignored the debate and looked at the ruined Defence classroom. The dream mist had been trapped, questioned, bitten once, and forced to retreat. The room had served its purpose, but it was not suitable for Quirrell.
Too many student memories.
Too many old lessons.
Too many abandoned fears.
A dream that fed on loose thoughts would find plenty of scraps here.
A detention room was better.
Not because it was pleasant.
Because it was simple.
Rules, walls, punishment, silence.
Few emotions were as repetitive as a student regretting being caught.
Repetition could become a cage.
Dumbledore followed Theodore's gaze and understood part of it.
"You want a room with a narrow emotional shape."
"Yes."
Filch frowned. "A what?"
"A room that knows what it is."
Filch understood that immediately.
"Detention."
"Exactly."
Filch straightened with pride, as if detention had finally received the academic respect it deserved.
Dumbledore sighed softly.
"I fear I have encouraged something."
They chose an old detention room near the lower west corridor.
Filch led the way with enthusiasm.
The room had not been used for years. Hogwarts had many such rooms, left behind by former caretakers, former professors, former punishments, and former ideas of discipline that Dumbledore had quietly discouraged.
The door was thick oak.
The floor was stone.
There were no windows.
The air smelled of dust, ink, and old resentment.
Filch opened the door like a man unveiling art.
"Beautiful."
Dumbledore looked inside.
"It is certainly… memorable."
Theodore stepped in.
The room was plain. That was good.
Four desks.
One chair.
A cupboard full of broken quills.
Scratches on the walls from generations of bored students.
A faint smell of dried ink.
No portraits.
No mirrors.
No decorative metal.
Nothing reflective enough for Golden Light.
No water source.
No plants except the one Theodore would bring.
No history grand enough to tempt the dream into performance.
Perfect.
Theodore touched the floor.
Wutu Divine Light sank into the stone.
The room became heavier.
Not physically.
Conceptually.
A room for staying.
A room for waiting.
A room where leaving required permission.
Filch watched with shining eyes.
Dumbledore looked more conflicted.
Theodore then placed a small willow root into the corner. It slipped into the floor and spread thin green lines under the stone, careful and quiet.
Yimu Divine Light followed.
The room gained life without gaining softness.
A leaf talisman formed on the inside of the door.
Then another.
Then another.
Filch hurried forward and pasted his own yellow talismans outside the frame.
Theodore looked at them.
"Not bad."
Filch's chest lifted.
Snape arrived at that moment.
He took one look at Filch's expression and immediately looked tired.
"Why does he look happy?"
Dumbledore said, "We are preparing a detention room."
Snape paused.
Then looked at Theodore.
"For the Dark Lord."
"Yes."
Snape closed his eyes briefly.
"I despise how often absurd sentences become practical here."
Filch muttered, "You're just upset you didn't think of it first."
Snape's eyes opened.
Filch suddenly became very interested in aligning a talisman.
The preparations took half an hour.
By the time they finished, the room no longer felt abandoned. It felt watchful. Still plain, still dusty, still unpleasant, but now its unpleasantness had direction.
Theodore stood at the center and raised one hand.
The Wuzhuang foundation answered from below.
Nine nails beneath the pitch.
Dream barriers around the common rooms.
Outer layer around the lake prison.
Classroom trap on the third floor.
Now, the detention room.
All connected by thin roots.
Not strong enough to defeat the thing below the lock.
Strong enough to decide what it heard.
Dumbledore studied the room.
"You intend to feed false information through Tom."
"Not false," Theodore said. "Selected."
Snape's mouth twitched.
"That is worse."
"It is cleaner."
"No, it is more elegant. That is why it is worse."
Dumbledore looked at Theodore over his spectacles.
"What do you want it to hear?"
Theodore smiled faintly.
"That we are afraid of the door."
Filch frowned. "Are we not?"
"Not in the way it needs."
Snape understood first.
"You want the thing below to think the door is still its best route."
"Yes."
"If it believes we are focused on the door, it may continue pushing there instead of searching for students."
"Exactly."
Dumbledore's face became serious.
"And Tom?"
"He will think he is learning something useful."
Snape gave a dry laugh.
"That part may not be difficult."
In the Headmaster's office, Quirrell felt the bindings loosen for the first time.
He panicked immediately.
The chair lifted from the floor under Dumbledore's spell, seals intact, talismans glowing. Fawkes flew above them like a torch with wings.
Quirrell looked from Dumbledore to Theodore to Snape.
"W-where are you taking me?"
Filch appeared in the doorway with Mrs. Norris.
"Detention."
Quirrell's face went blank.
Behind the turban, Voldemort went silent.
Then his voice hissed.
"What?"
Filch looked extremely satisfied.
"You heard me."
Quirrell was carried through the corridors in his chair.
It was, even by Hogwarts standards, a strange sight.
A bound Defence professor floating through the castle.
Dumbledore walking beside him.
Snape following with the expression of a man attending an execution he had not arranged.
Theodore calm as ever.
Filch leading the procession with a lantern and the pride of a caretaker finally seeing justice become furniture.
Luckily, the corridors had been cleared.
Mostly.
Peeves spotted them from a chandelier.
For once, he did not throw anything.
He stared.
Then whispered, "Ooooh. Teacher detention."
Filch pointed at him.
"Say one word to students and I will talisman the ceiling."
Peeves vanished.
Snape looked at Filch despite himself.
"That threat worked?"
Filch lifted his chin.
"I know my corridor."
They placed Quirrell in the detention room.
The chair settled at the center.
The door remained open for the moment.
Quirrell looked around.
Bare walls.
Stone floor.
Old desks.
Yellow talismans.
Green leaf marks.
No windows.
His face crumpled.
"This is worse than the office."
Filch looked offended.
"It is supposed to be."
Voldemort spoke through him, low and venomous.
"You think walls and paper can hold me?"
Theodore stepped forward.
"No."
The room grew still.
"We think your pride can."
Voldemort's eyes through Quirrell's face narrowed.
Dumbledore's wand lowered slightly.
Snape watched carefully.
Theodore continued, "You heard the question below the lock. You answered it. Now you think you have a path."
Voldemort smiled.
"Perhaps I do."
"Good."
That smile faltered.
Theodore looked at the floor.
The black mark under Quirrell's chair pulsed faintly, already testing the new room.
The detention room answered.
Not with power.
With refusal.
Stay.
Wait.
No leaving without permission.
The mark slowed.
Voldemort noticed.
His expression turned ugly.
Dumbledore said quietly, "Tom, every path has two directions."
Theodore added, "And every listener can be made to hear only part of the conversation."
The black mark pulsed again.
This time, Theodore allowed it to spread slightly.
Only slightly.
Through the floor.
Through the Wuzhuang foundation.
Toward a prepared echo of the dream door.
Not the real door.
A model.
A decoy.
Voldemort felt the path open and immediately reached toward it.
Quirrell screamed.
The thorn on his forehead burned.
Snape stepped forward.
"Still letting others drag you around, Quirrell?"
Quirrell's scream broke into a gasp.
His own eyes surfaced for a moment.
Snape's voice was cold.
"Pathetic. At least resist badly. It would be an improvement."
Quirrell shook.
The thorn held.
The mark's spread slowed.
Theodore guided the remaining pulse into the decoy.
Far below Hogwarts, beneath the lock, the thing behind the black door heard a message.
Fear.
Urgency.
Attention focused on the door.
An old bloodline nearby.
A hungry soul reaching.
A school trying to prevent the door from opening.
All true.
All incomplete.
The thing below listened.
Then pressed back.
The detention room darkened.
The talismans burned brighter.
Filch grabbed his peachwood sword.
Dumbledore lifted his wand.
Fawkes cried from above.
The pressure lasted three seconds.
Then vanished.
The black mark under Quirrell's chair dimmed.
The decoy had worked.
For now.
Theodore looked satisfied.
Voldemort did not.
He had felt the response, but not enough to understand it. The path had opened, then narrowed, then left him with only a taste.
That would bother him.
Good.
A frustrated Voldemort was predictable.
A hopeful Voldemort was even more predictable.
Dumbledore looked at Theodore.
"It believed the echo?"
"It believed the hunger."
"That is not quite the same."
"It is enough."
Snape stared at the mark.
"You are dangling the Dark Lord like bait."
Theodore smiled.
"Carefully."
Snape looked at Dumbledore.
"Do you approve of this?"
Dumbledore was silent for a moment.
Then he looked at Quirrell.
At the thorn.
At the mark.
At the room built to hold not only a man, but a conversation with something below history.
"No," Dumbledore said softly. "But I understand why we are doing it."
That was the most honest answer in the room.
Quirrell slumped in the chair, trembling.
For one breath, his own voice emerged.
"Please…"
Dumbledore stepped closer.
"You must hold on, Professor."
Quirrell laughed weakly.
"I am not good at that."
Snape said, "Obviously."
The thorn warmed.
Quirrell's broken laugh came again.
This time, it lasted a little longer.
Voldemort hated it.
The detention room accepted it.
A pathetic laugh.
A personal sound.
A little more Quirrell.
A little less vessel.
Theodore watched the black mark shrink around the chair.
Good.
The trap had three functions now.
Contain Voldemort.
Mislead the thing below.
Teach Quirrell to remain himself badly enough to be useful.
Strange work.
Necessary work.
Very Hogwarts work.
Before leaving, Filch pasted one last talisman on the outside of the door.
It read, in his rough handwriting:
DETENTION IN PROGRESS. DO NOT DISTURB.
Dumbledore looked at it.
"Argus."
"Yes, Headmaster?"
"Perhaps remove the word detention."
Filch looked wounded.
Theodore said, "Leave it."
Filch brightened.
Snape muttered, "Of course."
The door closed.
Inside, Quirrell sat in the chair.
Voldemort waited in the dark behind his thoughts.
The mark beneath him pulsed faintly, connected now to an echo that led nowhere useful.
And far below Hogwarts, behind the black door, the dream smiled at what it thought it had heard.
Above it, Gatekeeper slept.
Around it, the Wuzhuang foundation quietly grew another root.
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