The Chinese girl from Hufflepuff is both timid and brave

The Hogwarts Express is a red train converted from a Muggle train. It looks old, but it has been modified and reinforced by many great wizards and regularly maintained by the Department of Magical Transport. Its overall safety is very reliable.

So the only ones attacking them were the shapeless Dementors, and no Death Eaters with dark magic sneaked in. And now, according to Lupin, after noticing the Anti-Apparition Spell, Kingsley Shacklebolt and his colleagues activated the train's own defense array, which could more effectively resist external invasion.

"How can Senior Sister Tonks get in? Can she drive away all the Dementors here by herself?" Sun Zhu asked the question that puzzled her the most. At present, there were some frightened juniors in carriages 6 and 7, and Fina and Carina were there to take care of them. She and Lupin went to the connection between carriages and alone. Not far away was the sightseeing corridor, but there was no one there at the moment.

As far as she knew, wizards had no effective way to kill Dementors, and could only use a Patronus to drive them away.

Despite the terrifying lethality of the Dementors, they are willing to serve as guards in Azkaban. When necessary, they even obey orders and go out to hunt down escaped suspects. This is because the Ministry of Magic promises that they can absorb all the positive emotions of the suspects in prison, but must not harm innocent people.

They are called soulless demons, but their most irresistible nature is appetite - all positive emotions of humans are their food source. Although they cannot be killed, any wizard who knows the Patronus Charm can drive them away, which makes their appetite often unable to be satisfied. So a certain Minister of Magic reached a cooperation with them, and they benefited each other for hundreds of years.

Having the most terrifying and vicious Dementors guard the most vicious outlaws is a way of fighting poison with poison.

But she was really surprised that the Dementors had defected so early.

After all, they are a group of things without intelligence or morality. In the original book, after Voldemort was resurrected, he promised them that they could absorb the positive emotions of others at will, so they would naturally rebel against the Ministry of Magic. But now they are just a group of Death Eaters, and they have attracted such a large number of Dementors to flee with them.

"Raising a tiger is a disaster. Will the Ministry of Magic still allow them to look after criminals in the future?" Sun Zhu sighed. "But these are all later stories. What will Senior Sister Tonks do?"

"We don't have a way to destroy them, but we have a way to severely damage them." Lupin explained, "They will actively absorb the happiness and other positive emotions of the people around them, and suck the souls of all creatures that have lost their ability to resist. This is an uncontrollable instinct. Dementors are essentially magical creatures. Padfoot's new magic item research team has created a batch of test subjects with contaminated souls. As long as Tonks brings them here, the Soul Eaters will actively absorb them and become as weak as if they were poisoned. Then they will have to leave."

"Those with polluted souls..." Sun Zhu was a little surprised, "Where do they come from?"

"The 'experimental samples' provided by the Department of Magical Hazards were probably magical creatures that were causing trouble and that they had confiscated from various places. Bigfoot gave them a large sum of money, and they just contributed all of them..." Lupin explained, "Similar to the Bandimangers and Billywig worms. The Department of Magical Creatures was originally responsible for recycling and processing them, but Bigfoot said he had another use for them, so..."

Sun Zhu nodded: "I know, they are actually the raw materials of some magic potions, but do they also have things like 'souls'?"

Lupin smiled with certainty: "Everything has a soul."

Sun Zhu was stunned by this, but quickly reacted: "I understand. Then, the most important thing is, how were they 'contaminated'? When was this..."

She suddenly thought of something and blinked at Lupin: "Could it be..."

Lupin looked out the window and nodded. "Yes, it was an experiment conducted by Bigfoot some time ago. At first, he only obtained a batch of test subjects with 'contaminated souls'. Later, he determined which component could 'eliminate the soul'."

Sun Zhu then looked out the window, which was still shrouded in darkness, and the icicles on the window glass showed no sign of fading. She crossed her arms and began to think about the thousands of uses of the snake monster's venom, and whether she should give it a chicken drumstick when she returned.

but……

"Could it be that Sirius has already caught Dementors and tested them? Otherwise, how can he be sure that these contaminated test subjects will have an effect on them?"

"No, of course not." Lupin chuckled, "But he's been tortured by these things in Azkaban before, so he knows them. Anyway, there's no harm in trying."

Why do I feel that this is what the big black dog likes to say? Professor Lupin may have been infected by him.

"Then we should try our best. After all, the train is still moving forward. If we drive them away earlier, the people on the train will suffer less. I think the situation of some of the younger students is already very bad."

Lupin nodded slightly, his eyes full of worry: "I will go check on the students. Please meet Tonks here."

Sun Zhu thought of the dozen or so people still at the front of the car and hummed worriedly.

She was the only idle prefect now, the others were either trapped or taking care of other students. Just now, senior sister Bernice sent a patronus to say that several freshmen from the Muggle world had started crying, saying that they had never seen such a dangerous school, and that they could encounter such a thing just by taking a bus to school.

This Dementor really brought shame to Hogwarts.

"Bang bang bang!"

A loud noise came from outside the window glass. Sun Zhu looked in the direction of the sound and saw a big bird that looked mighty and agile clinging to the edge of the glass and knocking on the window with its wings.

When the train activated its own defense array just now, all the windows were closed and could not be opened by human power.

She called out uncertainly, "Senior Tonks?"

The big bird tilted its head towards her, and Sun Zhu saw that there was a big package on each of its claws, but she couldn't hear what it said through the glass.

"Host, that is indeed your target person, Tonks. If you want to hear her clearly, just turn on the [Mission Marker]." Tongzi reminded.

"Oh, I haven't used it for so long that I almost forgot about it."

With Tongzi's cheats, she quickly understood Tonks' instructions: "Quick, the yellow package in my hand contains the potion prepared by the St. Mungo's pharmacist. Have any students been in close contact with Dementors? Give them this! The black package contains weapons to fight them. Sirius gave them this. I have to go to the front and try it out."

Sun Zhu pushed the window glass hard with her hands, but it was no use. After thinking it over, she could only pull out the beautifully shaped "hairpin" on her hair, which was the magic prop that Tongzi had rewarded her with.