The purpose of the trip has been achieved, and the people have not touched the obviously dangerous dark magic items and other strange collectibles.

Led by the pull ring, they returned the same way.

After another half an hour, the car finally returned to the ground after running wildly.

Breathing in the fresh air, looking at the familiar buildings on Diagon Alley and Professor Lupin smiling at him, Aven, Harry, and Hermione all had a feeling of being reborn into the world. Although the Black family's wealth was not seen as expected, the location of the vault and the myriad secrets of the Gringotts underground were exciting enough.

The three of them discuss with Lupin what they have seen and heard in the depths of the earth, the fire dragon chained to the islands in the boiling lava, the treasury of the pure-blood wizard family from a thousand years ago, and so on.

Of these, Evan was most interested in the vault, which was numbered one and had the Slater family crest.

He could be sure that there was definitely some connection between the ornamentation on the door of the vault and the strange ornamentation on the Slytherin locket in his arms.

One more point, about the secret treasure key left behind by the Big Four.

As for the hints about the location of the key, Evan had speculated.

From the literal meaning, since the Gryffindor Treasure Key is kept in the centaur tribe, it is very likely that the Slytherin key was hidden by the elves in Gringotts, in the mysterious vault that he just saw.

Now the question is how to determine this and get the key out?!

It's impossible to ask the goblins, and it's even worse to break into Gringotts directly.

Evan thought for a moment that if the Slytherin Treasure Key was really in Gringotts, it would have to start with the vampire girl named Elaine and his family.

Even vampires are descendants of House Slytherin.

Like Voldemort, they are the rightful heirs to that vault by blood.

As Evan pondered this, Lupin told Harry and Hermione about the magic the elves had set up in Gringotts, and the weaknesses of the dragon they had just met.

Sirius followed, uninvolved in the conversation.

I don't know if it was because of the crazy bumpy cart or the empty vault, he didn't look very happy.

He stared blankly ahead, not knowing what he was thinking.

Harry and Hermione quickly noticed the situation, and they exchanged uneasy glances, their faces full of concern, and the atmosphere fell silent.

Hermione poked Evan lightly, motioning for him to turn back to look at Sirius.

Evan looked back in surprise, he could understand Sirius's current appearance.

Although Sirius said that he didn't care about the treasure and gold, it was the wealth that the Black family had accumulated over the centuries, passed down from family to family, and now all of them were the property of other families.

Whoever encounters this kind of thing will be unhappy.

Especially since it was Sirius's mother who distributed the property, and she preferred to trust his two cousins rather than leave something for her own son.

If this kind of thing happened to Evan himself, he would be sad to death.

"Sirius," Harry cried out worriedly.

"I'm fine, just remembering some unpleasant past!" Sirius took a deep breath of cold air and pulled himself together to join their conversation, "Remus is right, the dragon's weakness is in the eye, and it can be used to attack that place with an eye spell or other spell to make them retreat from the pain. In addition to this, each fire dragon also has a particularly fragile scale on its body, if you want to slay the dragon"

As they walked, Sirius looked fully recovered.

Before heading back to the Leaky Cauldron for lunch, everyone decided to go to 36 Diagon Lane to have a look.

They left the main road and turned into a narrow, backlit street with snow that hadn't been cleared for a long time, reaching knee-deep at its deepest point.

The streets were very depressed, and all the shops were not open.

Only a small, dilapidated shop was open, and an old wizard with two large light-colored eyes was sweeping the snow in front of the shop, and the gold sign above his head was peeling off, which read: Ollivanders, a well-made wand since 382 BC.

Seeing Mr. Ollivanders, Evan was surprised.

He was the same as the last time he saw it, without the slightest change.

"Good afternoon, Mr. Ollivander!" everyone hurriedly stepped forward to greet them.

"Good afternoon, everyone, it's a pleasure to meet you!" Ollivander looked up, his pale pupils swept across the faces of the five people one by one, staying on Evan and Harry for the longest time, and finally falling on Sirius, "Sirius Black, it's such a pleasure to meet you again, it's been more than twenty years since we last met, I didn't think I had this opportunity"

"Oh yes, I didn't think I had a chance to go back to Diagon Alley. Sirius said pleasantly, "You've read the recent reports, and with the help of these three children, I've been proven innocent. ”

"Of course, of course!" said Ollivander happily, "Higashi-Aoki, twelve inches long, is good at using transfiguration magic, right?"

"Yes, but that wand was broken twelve years ago when I was caught by the Ministry of Magic. Sirius pulled out his wand and said regretfully, "It's a good wand, and I don't have the one I used to use now." ”

"Of course not, it's resisting your power!" Ollivander said in a soft voice, "This wand doesn't belong to you, I don't know where you got it." It was the work of my grandfather, a very ancient craft, elm and dragon nerves, a bit tough, in those days, the materials on dragons were very rare and only the richest pure-blood wizard families could afford to buy them"

Ollivander took the wand from Sirius, looked closely, and told the wand its good, bad, and history, as if he were appreciating a work of art.

"Mr. Ollivanders?!"

"Oh yes!" Ollivander returned his wand to Sirius, "It's great, but it's not for you! ”

"I don't think there's a need for this, I'm not a young wizard just coming of age, I can master any wand. Sirius said conceitedly.

"That's a shame," Ollivander continued, "You know, it's the wand that chooses the wizard, and using someone else's wand will affect your own power. ”

"Mr. Ollivander is right, you really should change your wand. Evan followed suit, knowing how important wands were to wizards.

For wizards, using someone else's wand can be extremely uncomfortable, affecting the power of the spell and the transmission of mana, and a powerful wand can even resist the user's will.

In the original books, Voldemort died for this reason when he resisted the Killing Curse on his true owner, Harry, for this reason.

Sirius was also because of this, he had been running away in the original books, and it was impossible for him to choose a wand of his own, and he must have used it with this wand belonging to one of his ancestors, as he does now.

When he duel with Bellatrix, he was unable to use his true strength due to his wand, and was eventually defeated and lost his life.

For Sirius, in order to deal with the dangers he will face in the future, it is necessary to change his wand.

"Sirius, since both Mr. Ollivander and Aven say so, go and change your wand," Harry said with concern.

"There's no need, I can control this wand!" Sirius replied stubbornly.

"That's only temporary, and it will affect you more and more over time. Ollivander whispered, "The core of this wand is the nerves of dragons, you know, dragons are very powerful creatures, they will not obey at will"

Hearing Ollivanders' words, Harry hurriedly shouted, "Sirius!"

"Alright, well, I can come back later when I have time!" Sirius said in a soft tone, putting his arm around Harry's shoulder, "Don't you guys remember? We're going to the store now, and we're going to visit the Weasley boy in the hospital later, so we can't afford to waste time here." ”

"It won't take much time, we can wait for you in the store. Evan pointed to a very dilapidated house not far from the wand shop and said, "I see the door number, it's 36 Diagon Lane!" (to be continued.) )