When Hoffa returned to the school hall, all the students fell asleep here. None of the students returned to the common room. They got into their sleeping bags and slept on the floor.

This scene is strikingly similar to the one when Sirius invaded the school, but its nature is worse than that one.

On the ceiling, the dark nebula rotates slowly, with some green lines shining like eyes.

The only light source in the hall is the Hogwarts pearl in the center of the hall. It slowly rotates, and the dense light seems to be squeezed by the darkness, dim and weak.

It has no protective effect at all.

Countless teachers patrol around the tower and hall, and even the floating ghosts keep on guard.

But no one knows where the terrible guy got into the school, and Hoffa couldn't figure it out.

There are sentries outside the school where trains can't get in. The whole forbidden forest is strictly guarded by the Aurors. Even the secret road inside the school is blocked by the school teachers. This year, students are not allowed to go to Hogsmeade.

How the hell did that guy get in?

Hoffa walked through a group of patrolling Aurors and came to his two friends. His pace was so light that he didn't wake anyone.

But agraia was not asleep at the moment. Her blue eyes were flashing in the dark. When she saw Hoffa coming, she immediately sat up from the ground and wanted to speak.

"Shh."

Hoffa looked around at the sleeping people and motioned to her to keep her voice down.

"Did you ask the result?"

In the dark, agraia whispered in an exaggerated voice.

Hoffa shook his head.

Agleia was worried: "how can this happen? Who is it? How can he know where I hide things? If it's not Slytherin...

" shh. "

Hoffa shook his head and motioned to aglia not to speak.

When she was quiet, Hoffa whispered in her ear.

"Is that the key, too?"

"What are you talking about?"

Agraia rubbed her hair and her chest heaved violently, looking very excited.

"Your bracelet?"

"What are you talking about? What key? "

Hoffa thought for a moment.

"Nothing."

In the dark, a few Aurors passed by.

Hoffa lay down with aglia.

Auror walked slowly on patrol, his eyes sweeping over a row of sleeping bags on the ground. The slender body slowly disappeared into the darkness.

When the footsteps disappeared, Hoffa looked sideways at agraia's blue eyes, and she looked at herself in the dark.

"I'm a little scared, Hoffa."

She whispered.

Normally, Hoffa had to sneer at her, but now he patted her on the back of the hand.

"It doesn't matter."

Then let go and sit up, get up and walk through the sleeping bags on the ground.

The ghost wandered and disappeared into the dark hall.

...

...

Hoffa knew the location of osivia's office, even if he didn't want to know, he was forced to know. Because his roommates have been familiar with the teacher's daily whereabouts for a long time, they have to talk about their children's teachers every night.

Her office is on the ground floor, next to the Slytherin common room. It was rumored that Dumbledore wanted to give her her sunny office on the third floor, but she refused. On the ground of acclimatization.

Hoffa looked at his watch. It was almost one o'clock in the morning. He was not sure if osivia would be in the office.

He stood outside and hesitated for a moment, but knocked.

"In."

Almost at the moment when he knocked on the door, there came a faint female voice.

The door handle on the office creaked and opened automatically. Hoffa saw a spiral staircase leading to the ground. There was the sound of water in it.

Hoffa walked down slowly. Was this the longest escalator he had ever walked, or down.

After walking more than 10 meters of revolving steps, the gurgling water became louder in the dark.

Her office is different from Slughorn's, it's a standard Slytherin's.

The office was dark and dreary. The furnishings are simple.

There is an all glass wall in the office. Outside the glass wall, there is a dark lake. In the lake, the faint moonlight is the only light source of this underground office. In the lake, there are some dark shadows swimming in it.

When his eyes became familiar with the darkness, he could see a huge snake head statue on the wall.

A spring of water gushed from the mouth of the statue and then dropped into the pool.

Sitting on the snake's head, osivia Panxi seems to have merged with the black background. If it wasn't for the faint green light in her eyes, Hoffa could hardly recognize the trace of her existence.This water snake nest made Hoffa instinctively uncomfortable.

"I heard about your common room."

Osivia said softly, "creepy."

Her voice was a little vague in the sound of the spring.

Hoffa didn't speak, just looked up at her.

Osivia: you come to me, that means you have a good idea

Hoffa took a few steps sideways: "I can be your teaching assistant, not only to watch, but also to find that person."

"That's not what I'm looking for." Said osivia, dully.

"That's my goal." "Not only that, I have a condition," Hoffa said

"What?"

"I want to know everything. I need you to tell me everything about the Demi king and why he was in Ravenclaw tower."

"Sorry, I can't answer your question. I don't know the so-called half man king, let alone his identity."

"Didn't you fight?"

"Yes, but I failed that time. I didn't get any information about that fight. But I'm sure he's not a wizard. "

"What can you tell me?"

Osivia slipped quietly down from the snake carving and came to Hoffa, looking into his pale gold eyes.

"I can take you to the forbidden library. Whatever that guy wants to do, it's the forbidden library. As long as you find the library and lay a net there, the most powerful opponent will not be the opponent of hundreds of Aurors. "

Hoffa was silent for a moment.

"After killing him? What would you do, get the knowledge in the library? "

"I don't care." Osivia shook her head.

Hoffa: "do you care about the ambitious people in Britain, what they will do after they get the endless ban, do you care?"

Osivia shook his head: "I don't care, the world is chaotic and crazy, with or without the library, those ambitious people will not disappear."

"So it is."

Hoffa sighed and held out his hand.

"I hope this time we can reach the same goal."

Osivia's cold hand held Hoffa's, and when she released it, Hoffa felt a hard object in it.

He looked down, it was a silver sign, snake shaped, carved with a row of small characters, deformation class assistant.

"I'll wait for you at the library gate after school at six tomorrow afternoon." Said osivia.

"Which library?"

"Hogwarts library."