Save the Bachelor of Heaven

At the end of the fourth grade, on the full moon night of May, Xiang Nan looked expectantly at Fenrir's transformation into wolf form again.

"Fenrir, how do you feel?" he asked.

"I feel good." Fenrir, who had transformed into a wolf, sneered. Suddenly, one claw tore his throat, and the other claw pierced his left chest, pulling out his heart directly. "I won't let you torture me anymore. I would rather die than be your slave. I'm free, hahahaha..."

Xiang Nan was shocked and was ready to cast a powerful healing spell to help it heal. But Fenrir had already died at this time.

Even a werewolf would find it difficult to survive after such a severe injury. Fenrir Greyback, the wolf king of a generation, was killed.

Seeing such a bloody and tragic scene, Xiang Nan did not have any sympathy.

With the sins committed by Fenrir Greyback, it was absolutely deserved for its fate.

Xiang Nan just regretted that he had lost a good experimental subject from then on.

"It seems that the wolf poison potion really worked. It completely retained all its sanity." Xiang Nan recorded in his notebook.

Because of years of imprisonment and torture, Fenrir had hoped that Xiang Nan would kill him or seek a way to commit suicide more than a year ago.

However, when it was awake, its hands and feet were locked, and it couldn't commit suicide.

After turning into a werewolf, although it could break free with its hands and feet, it lost its sanity and was completely controlled by the werewolf instinct.

Although the werewolf had no sanity, it also had the instinct to protect itself, so it was impossible for it to commit suicide.

Therefore, it fell into a paradox: when it was awake, it wanted to commit suicide but couldn't; after turning into a werewolf, it could commit suicide but didn't want to.

Until Xiang Nan invented a qualified wolf poison potion, Fenrir turned into a werewolf, but it retained human sanity, so it finally committed suicide.

It used its death to prove that Xiang Nan's wolf poison potion was indeed effective.

"You died a worthy death. I hope that after death, your soul can be liberated and go to the other side." Xiang Nan prayed for Fenrir.

Then he cut off Fenrir's head, and as for the other parts, he directly used the Vanishing Charm to make them return to all things and become invisible.

...

In June, a week before the last full moon night, Xiang Nan found Remus Lupin.

"Lupin, I'll give you something to drink." He said with a smile, and offered the boiled wolfsbane potion.

"What is this?" Lupin looked at the steaming potion and couldn't help frowning and asked.

The color of this potion was very bad. To put it nicely, it looked like burnt coffee. To put it bluntly, it looked like cement brewed with water.

"It's a tonic." Xiang Nan smiled, "I noticed that you feel uncomfortable for a period of time every month, which should be caused by physical weakness, so I specially made this cup of tonic for you. Drink it, and your body will be much better after drinking it."

"This..." Lupin was embarrassed.

The reason why he felt uncomfortable for a few days every month was because he would turn into a werewolf on the full moon night every month.

In order to avoid being discovered, he would take leave two days before the full moon night every month. He either said he was sick or something happened at home, and then he went out to hide for two days and waited until the full moon to return to school.

And every time he transformed into a werewolf, it was a torture, so even if he returned to school, he would feel uncomfortable for a few days, weak and ugly.

It should be useless to drink tonic for this kind of "disease".

"Don't worry, drink it, don't you still trust me, it will definitely work." Xiang Nan smiled.

Seeing him say that, Lupin had no choice but to nod.

To be honest, Xiang Nan's potions are indeed well-known in Hogwarts.

His hot potion, cold potion, intelligence potion, etc. are all very popular and have good efficacy.

If he refuses again, it will not only damage the relationship between classmates, but may even expose his secrets. Therefore, Lupin had to take the cup of medicine and drink it all.

"Wow, it's so bitter~" he said with a trembling body, and his tongue was numb because it was so bitter. It was really hard to drink.

"Good medicine tastes bitter but is good for the disease. You will be grateful to me." Xiang Nan smiled.

…

A week later, on a full-moon night.

Xiang Nan passed through the entrance under the Whomping Willow, entered a winding tunnel, and finally came to a dilapidated house, which was the Screaming Shack outside Hogsmeade Village.

At this time, Lupin had completed his transformation into a werewolf and was standing in the house with a blank face.

Because he found that he had not lost his mind, but remained awake. This had never happened before, and he couldn't help but feel a little confused.

"How is it, my potion is effective, I said you would be grateful to me." Xiang Nan smiled.

Lupin was startled and looked in the direction of the sound. He saw Xiang Nan, and his expression froze, and then he fell into panic, fear, and shame.

"Don't worry, it's okay, I won't reveal your secret." Xiang Nan waved his hand, "Otherwise, I wouldn't make medicine for you."

"Thank you." Lupin was stunned for a moment and finally spoke.

"You're welcome." Xiang Nan waved his hand and said, "I've made a lot more. From now on, one week before the full moon, you just need to drink a cup, and you will stay rational after the transformation, so you won't hurt yourself or others."

"Great." Lupin said gratefully.

He has always been very kind and worried that he would hurt his parents, friends and innocent people after becoming a werewolf. With this potion, he no longer has to be afraid.

"Severus, you are really amazing." He said admiringly again.

Werewolves have been a great threat since ancient times. Their danger level is as high as five stars, comparable to dragons, basilisks, leopards, and giant spiders, and they are feared and excluded by wizards and Muggles.

Historically, people have been looking for ways to treat werewolves, but to no avail.

I didn't expect Xiang Nan to invent a potion that can keep werewolves sane after transformation. For werewolves, it is undoubtedly a panacea.

"Thank you." Xiang Nan smiled and nodded, "Maybe I will get a Merlin medal for this."

"Yes, you deserve it." Lupin nodded.

Xiang Nan's move will save countless werewolves, which is a great merit, and he is very grateful.

"But this potion can only treat the symptoms, not the root cause." Xiang Nan added, "I will continue to work hard to develop a potion or spell that can truly cure werewolves."

In "Harry Potter and the Secret", Gilderoy Lockhart once said that he used a complex humanoid spell to completely cure a werewolf and turned him back into a human.

Although he was bragging and attributed the deeds of an old wizard in Armenia to himself. But since there is a prototype of the story, it means that there is actually a cure for werewolves.

It's just that this spell is very complicated, Xiang Nan doesn't know it, Voldemort doesn't know it, and of course he won't study this kind of magic. He hopes that there will be more and more werewolves, so that there will be more minions to listen to his orders.

So Xiang Nan still has to explore slowly.

"Thank you." Hearing him say this, Lupin was very grateful.