London, 12 Grimmauld Place,

With a burst of spatial staggering, several figures appeared out of thin air in the living room of Black's old mansion.

"It's so dangerous, it's just a little bit, I'm afraid we won't be able to come back..."Cold sweat broke out on Ivan's forehead, in the seconds before leaving, the Fierce Fire Phoenix was completely out of his control, if the teleportation was too late, the consequences would be unimaginable.

"It's good to know, you'd better stop using this dangerous dark magic in the future," Sirius reminded in earnest.

Sirius felt that this time the magic was out of control was not necessarily a bad thing, because it would probably teach Ivan a deep enough lesson.

Ivan nodded solemnly.

However, unlike Sirius imagined, Ivan noticed the danger of the fire, but also saw the unparalleled destructive power of the fire.

The fierce fire phoenix that used thousands of Yin corpses as fuel in the cave and swelled to tens of meters long was the most powerful magic he had ever seen!

Except for using the shapeshifter to run away, Ivan couldn't find a way to suppress it.

If he can skillfully master this power and apply it to actual combat, then his strength will be able to rise to a higher level again, and it is not impossible to rely on the characteristics of fierce fire to fight against more than a dozen wizards at one time!

Of course, under normal circumstances, it is impossible for Lihuo to expand to this point without enough nutrients.

Before mastering the counterspell that could suppress the fierce fire, Ivan did not have the courage to use it on a large scale, otherwise he would be dooming his opponent to release this curse.

While Ivan was thinking, the sound of hurried footsteps came from the back room, followed by a familiar voice.

"Sirius, Ivan, Professor Lupin, great, you're finally back!" Harry excitedly stepped forward and hugged Sirius.

He had been frightened for a long time in Black's old mansion, and when he heard the movement, he ran out as fast as he could.

Harry breathed a sigh of relief when he saw that everyone was okay, but Lupin, who had transformed into a werewolf, really startled him.

Harry knew that Professor Lupin was a werewolf wizard, but it was the first time he had seen Lupin transformed.

Lupin also realized that it was a little wrong for him to maintain his transformed form, and looked at his two paws very uncomfortably, and asked awkwardly.

"Ivan, how should I change back now?"

Ivan scratched his head, how could he know that he was not a werewolf, but thinking that it would be easy for Fren to switch back and forth between the two forms, he asked Lupin to think about what it felt like to change back to his original form every time he was on a full moon night.

Lupin tried, and when this thought came to his mind, his body began to react, and the two sharp claws slowly retracted, the tall body quickly shrank, and the hideous head changed to its original appearance.

"It's simply amazing!" Lupin couldn't help but sigh, he realized that he could turn back into a werewolf as long as he thought about it, so he looked at Ivan eagerly and asked again.

"What was that potion you gave me earlier? Wolf venom potion? I remember that the wolf poison potions on the market should not have this effect. ”

"That's an improved wolf poison potion I developed not long ago! It allows the werewolf wizard who drinks it to have the ability to freely control the transformation for fifty days, and stay awake at all times while transforming. Ivan explained, and then suddenly remembered something, and continued.

"Oh, by the way, I forgot to mention that after drinking the potion, the werewolf wizard will no longer have the ability to infect others during this time!"

"In other words, I can not only transform at will now, but I don't have to worry about accidentally hurting others?" Lupin stepped forward and grabbed Ivan's wrist in two steps, and asked excitedly.

"That's right! However, the effect of the medicine is only fifty days, and after this time, you have to drink the medicine again. Ivan nodded affirmatively,

"Enough... Enough is enough! Lupin muttered to himself, suddenly took a few steps back and bowed deeply to Ivan.

"Professor Lupin, what are you doing here?" Ivan didn't anticipate Lupin's move at all, and hurriedly backed away.

"Thank you for your help to us werewolf wizards... If this potion had become widespread, I think the werewolves in the wizarding world would have fared much better. Lupin looked at Ivan with great emotion.

If he remembered correctly, Ivan had only developed the wolf poison potion the year before last, and it took a long time to get the improved wolf poison potion, which shows that Ivan is very concerned about changing the living conditions of these werewolf wizards.

The reason why wizards in the wizarding world hate werewolf wizards so much is that in addition to losing their minds when they transform every month, the more important thing is the werewolf's ability to infect.

The improved wolf poison potion directly solves these two problems, and if there is no time limit, Ivan can already declare that the werewolf group has been cured.

Sirius on the side was also happy about this, and even joked that if this potion became popular one day, werewolves might be respected by a group of fanatics.

Because there will be a large number of power-seeking wizards who desperately want to convert themselves into werewolves.

Harry couldn't quite understand the importance of the improved Wolf Poison Potion to Lupin, but that didn't stop him from rejoicing along.

However, Ivan poured cold water on them. "Professor Lupin, this new type of improved potion requires a lot of precious materials to produce, and I'm afraid it won't be able to spread in a short period of time!"

Ivan wouldn't have sold the improved wolf poison potion because of Lupin's few words.

He knows very well that there are good and orderly werewolves like Fren and Lupin in the group of werewolf wizards, but more of them are werewolf wizards who have degenerated into dark wizards and rely on robbery, murder, and petty theft to survive.

You must know that in the two wizarding wars in the original time and space, most of the werewolf wizards were firmly on the side of the Dark Lord, and they were all doing the work of spreading fear and creating chaos, and Ivan didn't want to increase the strength of his enemies.

Hearing Ivan say this, Lupin was somewhat disappointed, but he didn't pay too much attention to it, it was normal for new potions to not be popularized in a short period of time.

The speed at which Ivan improved the potion also gave Lupin confidence that it might not be long before Ivan could develop a potion that would completely cure werewolves.

"We'll talk about the wolf poison potion later, but now it's imperative to settle Regulus first!" Ivan diverted the topic and set his eyes on Regulus, who Sirius was carrying,

Lupin immediately looked apologetically at Sirius, who had forgotten about the Wolf Poison Potion just now.

Sirius, of course, didn't care, he told Ivan and Lupin to wait here for a while, went to the basement alone to take out a coffin, and then led them to a wasteland with apparition.

There are many graves here, which look like they haven't been tended for a long time, and the tombstones are covered with dirt and fallen leaves, but the inscriptions on them can vaguely indicate that the people buried here are all members of the Black family.

Ivan turned his head and happened to see a familiar name written on a tombstone next to him - Phineas Nigelus Black.

He had seen his portrait on the portrait of the Headmaster's Office, the most unpopular Headmaster in Hogwarts history, and it was rumored that all the students and teachers at the school hated him at the time.

However, the members of the Black family apparently did not think so, so the column below the inscription that wrote the honor - Phineas Nigellus Black, the most distinguished Headmaster of Hogwarts and a recipient of the Order of Merlin of the First Class, had made outstanding contributions to the wizarding world during his lifetime.

Sirius didn't look at the tombstones, but paid homage to anyone here, but dug up a clearing with a shovel on his own.

Lupin and Ivan stepped forward to help, but he refused.

Sirius worked from night to morning, digging the pit with a shovel without any magic, inscribed Regulus' name on a blank tombstone, and began to write about Regulus's honor, as was customary.

Sirius wrote a lot, even about the little things like getting a compliment from Head Slytherin when Regulus was in his fourth year.

It wasn't worth mentioning compared to the feats of the other Black members on the tombstones, but Sirius didn't care about those rules.

It's not so much that he's writing about the honors that Regulus has received, but rather that he's slowly reminiscing about some of his brother's past.

I couldn't write it anymore, and Sirius solemnly noted in the last line that Regulus was a fighter against the Dark Lord, a well-deserved hero!

With the inscription written, Sirius stood up and turned his gaze to Regulus, who had been placed aside, released from his petrified state and tightly bound.

A person who is transformed into a Yin corpse will have a soul trapped in a shell, so there is only one way to free Regulus.

“Incendio！ (Flames)" hesitated for a long time, and Sirius gritted his teeth and waved his wand.

A tongue of fire erupted from the tip of the wand and slammed into Regulus, turning him into a torch.

Regulus, who had been transformed into a corpse, struggled hard, his mouth wide open and let out a burst of painful wails, but to no avail.

Kreacher fell to his knees and cried bitterly, muttering the name of Regulus over and over again.

Regulus's struggle in the firelight became smaller and smaller, and the wailing gradually faded away, and vaguely, Ivan saw that Regulus's painful and hideous face seemed to become much calmer.

Sirius stood still, with his back to the crowd, making it impossible to see his current expression.

When the flames were extinguished, Sirius stepped forward and began to collect the remains of Regulus, and put many of the relics that had been turned out of the house into the coffin, and finally buried them in the dust.

With all this in mind, the depressed Sirius led them back to the Black family's mansion.

Everyone present stayed up all night, especially Ivan and Sirius, who also dived into the cold lake bottom to fish for corpses, and their physical strength and magic power were almost consumed, and it was all up to their own willpower to survive until now.

So after returning to the mansion and simply nibbling a few pieces of bread to satisfy their hunger, everyone was not in the mood to talk more, so they all went back to their rooms to rest, and slept until the next morning.

While eating breakfast, Harry curiously asked about the process of scooping up the corpses yesterday, Sirius didn't want Harry to worry, but just lightly told them about their experience dealing with those Yin corpses.

Even ignoring the most thrilling scenes, Harry's heart was beating as he fought the corpse in the dark lake, and he doubted that he would have come back alive if he had insisted on going with him.

Lupin made some additions at the right time, telling him and Dobby about the attack of the Yin corpse while they were waiting on the shore of the lake.

Presumably because Sirius hit Regulus with a petrification charm at the bottom of the lake, triggering some kind of restriction, they were also attacked by the Yin Corps on the shore.

With the flame spell greatly weakened, he and Dobby were only able to alternately fluoresce to disperse the group of Yin corpses, and when the mana was almost exhausted, he remembered the bottle of potion that Ivan had given him.

"After I drank the potion, I tried to turn into a werewolf and defeat the Yin corpses that stood in my way, and then followed the fire to find you." Lupin roughly recounted what had happened.

"So, Ivan summoned a flaming phoenix in that cave and burned thousands of Yin corpses?" When Harry heard it all, he was most interested in this, and how powerful magic it must be to do that.

"It was a fire spell, I accidentally saw it in the book "Cutting-edge Black Arts Decryption" when I was looking for Horcrux information, and I thought that this special magic might be effective for Voldemort's Horcrux, so I wrote it down." Ivan explained a word, lest Lupin misunderstand.

Then Ivan looked at Harry again and said in warning. "Fierce fire is a very dangerous black magic, it is easy to get out of control, even some powerful wizards can't fully control it, if we hadn't teleported in time this time, I'm afraid we would have been burned to death by the out-of-control fire!"

Harry nodded hesitantly.

Ivan didn't say anything more, for a young wizard like Harry, who was thirteen or fourteen years old and didn't like to learn much, it was almost impossible to take the initiative to go to the library to learn magic, so he was very relieved.

After a hurried breakfast, Ivan said hello to Sirius, entered the Black family's library, reopened the book "Cutting-edge Black Magic Decryption", and successfully found the counterspell corresponding to the fire spell!

This is also the reason why Fierce Fire is not listed as an unforgivable curse, because as long as you know how to counter the curse, the wizard can use magic to restrain Fierce Fire and extinguish it!

However, this kind of anti-spell is only useful for a small area of fire, and if a huge fire phoenix like the one in the cave is formed, even the counter-spell will be completely useless.