It's a large cavern, with a stone staircase leading in the direction of the tunnel you just flew into. If it weren't for Zhang Xu preparing the flight path, everyone would have to swim in.

"This is the place, yes." Scarlet said to Dumbledore, "This place has been enchanted. ”

"Yes, Halleyson." Dumbledore nodded.

"Feel it carefully and slowly with your magic, and you'll see the difference." Dumbledore said to the confused students next to him, in the same tone as he did every Friday when he was tutoring the students in classroom E-13.

Next, the students began to try to do what Dumbledore had told them to do, but most of them found nothing. They were all young, far from Dumbledore and Scarlet.

Zhang Xu squinted his eyes and looked at the entire cave, he could only vaguely feel the traces of magic coming from the rock wall, but it was not clear, it was like seeing flowers in the fog.

Fleur also made a discovery, and pointed to the stone mural with her finger and said, "This place is a little different. ”

Dumbledore, who was examining the stone wall with his fingers, smiled and nodded to Fleur, saying, "I think so too, Miss Delacour. ”

After a while, Dumbledore's hands pressed against the rock wall and said to everyone, "The hidden entrance is here, let's go in from here, everyone get ready." ”

Harry and the others took out their wands as if they were facing a great enemy.

Zhang Xu took out a glass bottle and poured out more than twenty red paper cranes from it.

These paper cranes flew into the air and kept hovering over Zhang Xu's head.

Dumbledore couldn't help but be stunned for a moment when he saw these paper cranes.

He could see the difference between these cranes and the cranes that had been used to convey credit.

Scarlett was in a trance, as if he remembered something.

The others were very curious, they usually bought a thousand paper cranes from Zhang Xu, and they saw it for the first time.

Seeing that everyone was ready, Dumbledore took a few steps back from the rock wall and pointed his wand at the rock.

The next moment, the outline of an arch that radiated a strong white light appeared on the rock wall.

Immediately afterwards, the outline of the arch disappeared, the white light disappeared, and the rock wall returned to its original state.

The scene suddenly became a little awkward.

Dumbledore scratched the back of his head and refocused on the rock wall in front of him.

The others continued to be on guard, and no one dared to disturb Dumbledore, who was engrossed in observing the rock wall.

"I see, it's too low-level." Two minutes later, Dumbledore said, "We need to pay a price to pass." ”

"But, Professor Dumbledore, at what cost?" Zhang Xu asked.

"If I'm not mistaken, it's blood." Dumbledore replied as he pulled out a silver knife.

Without waiting for Zhang Xu to stop him, Dumbledore made a cut on his forearm, and a large amount of blood suddenly spurted out of the wound and sprinkled on the rock wall.

To the exclamations of everyone, Dumbledore slashed his wand across the wound, and the wound on his hand healed instantly, as if he had never been injured.

"The blood of a young man is worth more than that of an old man like me." Dumbledore said to his students with a smile.

It can be seen that Dumbledore's on-site teaching was a success, and the students at Hogwarts showed excited expressions, and even Fleur was affected by their emotions.

Zhang Xu took a small bottle of red potion and handed it to Dumbledore, Dumbledore was not polite, took the potion and opened the cap of the bottle and sniffed it habitually.

"What does it smell like?" Dumbledore's face wrinkled into a rag.

"Durian-flavored, Professor." Zhang Xu replied, "It can quickly replenish the blood you have lost." ”

"Well, it tastes pretty good." Dumbledore said, having finished drinking the potion.

At this moment, the arch on the rock wall reappeared, and after the intense white light disappeared, the arch did not disappear.

The rock that had been sprinkled with Dumbledore's blood was gone, replaced by a dark doorway.

Dumbledore looked at the arch and said contemptuously, "That's why I say it's too low." I'm sure you all understand that the reason is that you want your opponent to weaken yourself before you can enter. Once again, Voldemort failed to understand that there were many things that were far more terrible than physical damage. ”

Zhang Xu rubbed Scarlet's head, whose expression was a little wrong, and withdrew her hand before her wand swung over.

If Dumbledore's movements weren't too fast just now, Zhang Xu would have taken out a bag of blood bags for first aid and tried it.

"Fred, George, explore the path first." Zhang Xu said to his twin brothers.

Fred and George nodded, one of them using Transfiguration to conjure a hound, and the other cast a spell on the hound's body, causing a flame to burst out of its body that emitted an intense white light.

Then the fire dog ran into the tunnel behind the arch.

The tunnel behind the arch wasn't long, and the fire dog ran around inside a few times without doing anything.

Dumbledore nodded, then said, "Come with me, everyone, be careful." ”

Dumbledore was the first to enter the archway, followed by Zhang Xu and Fleur, followed by the Harry trio, then the twin brothers and Neville, and Scarlet behind the last side hall.

Everyone followed the fire dog out of the tunnel quickly, and then it was a very strange sight in front of their eyes.

Behind the tunnel was a surprisingly large cavern, and below the cave was a large black lake, and the light from the fire dog could not shine on the roof of the cave, nor on the other side of the lake.

Far away in the middle of the lake, probably in the middle of the lake, there was a hazy, green glow, like a torch in the darkness, reflected in the dead waters below.

Except for the green light in the lake and the light from the fire dog, there was a darkness that was so thick that it could not be dissolved.

Moreover, the light on the fire dog is not as penetrating as everyone expected, and the darkness here seems to be denser and thicker than the ordinary one.

(°o°)っ—☆… The thief shines

A huge pillar of light shot out from the tip of Zhang Xu's wand like a searchlight, and everyone carefully observed the cave and the lake they were in as they moved.

The cave is very high and wide, surrounded by rough rock walls.

The black lake occupies most of the cave, with only a small rocky road around it.

Zhang Xu held a magic wand in one hand and a telescope in the other to observe the green light in the middle of the lake.

"There's an island in the middle of a lake, and there's a shelf about half a man high, and on it is a basin that should be made of stone, and the green light comes from the basin." Zhang Xu told everyone about what he saw through the telescope.

Then Zhang Xu handed the telescope to Dumbledore, and after walking to the water's edge, he shot a pillar of light with his wand to the bottom of the water.

Just when Dumbledore was about to remind Zhang Xu not to touch the lake, everyone heard Zhang Xu's cold voice.

"Crazy! Inhumane! ”

This is the first time that everyone has known Zhang Xu for so many years and heard him with such an emotionless and even murderous voice.

Then everyone heard a loud "pop", which was Zhang Xu violently pinched off the magic wand that was casting magic in his hand, causing the wand to explode in his hand.