#99 - Hagrid's sudden departure

In the following days, Anduin began modifying and optimizing the new spell as soon as classes were over. Having gone through the development process of the previous two spells, Anduin didn't encounter any difficulties. Soon, he had modified the original spell into a combination of four runes.

By the end of October, he began a period of intensive testing.

The testing method was also very simple, mainly divided into two steps. The first step was to test whether the spell would harm living organisms. At this time, the rat would make its appearance. He would cast the spell on the rat a few times first, and then observe whether there were any abnormalities. If there were no problems, he would proceed to the next step. This was mainly because he had almost killed himself with his reckless experiments last time, so for safety's sake, he planned to add this step to all future experiments.

The second step was to start the actual test. He named the spell he had modified 'Sonic Repulsion Charm'. He cast the spell on himself, and then listened to the surrounding natural sounds. If he couldn't hear them, he would increase the power, asking Hagrid to shout a few times to help. Once that was effective, he would begin testing the 'Echo Charm'. Ultrasonic waves have a very high frequency, so theoretically, if he could block ultrasonic waves, he should be able to block all sound waves. Finally, he would test the 'Infrasonic Charm' one more time.

"The new combination of four runes can block natural sounds," Anduin thought after the experiment. "However, only rune number 3 can completely block ultrasonic waves, so I'll use this rune as the main body for optimization."

Anduin didn't rashly try the 'Infrasonic Charm' experiment. He wasn't prepared to experience being attacked by his own spell again, so he used the best-performing set of rune combinations as the basis for secondary optimization. He decided to prepare completely before conducting the final experiment.

After several more days of adjusting the spell and repeatedly experimenting with ultrasonic waves, Anduin finally decided to start testing the infrasonic charm.

"Time: October 31st, 19:38 PM, Infrasonic Charm second test record begins." Today was Halloween, and Hogwarts had prepared a sumptuous Christmas dinner for the students, as well as monster performances and the like, but Anduin wasn't interested in any of that. He decided to test the infrasonic charm again.

This time, he made all the preparations, even preparing two bottles of healing potions for himself, and asked Hagrid to keep an eye on him from a distance, so that he could come and help immediately if anything unexpected happened.

"Huff!" Anduin took a slight breath, adjusting his breathing and thoughts, to completely calm himself down.

Drawing his wand and aiming it at himself, Anduin steadily and accurately cast the 'Silencing Charm' that he had tested many times.

"Ahhh." Anduin shouted a few times to confirm that he couldn't hear any sound, and then began the infrasonic charm experiment.

He lightly waved his wand, and the runes of the spell condensed at the tip of the wand. With a slight flick of his wrist, a wave of magical power spread out from the tip of the wand, but Anduin didn't hear any sound at this time, and there was no reaction on his body. This even made Anduin wonder if the spell had been cast successfully.

He waved his wand again, and Anduin extinguished the spell. To confirm, he looked at the rat in the cage next to him, and sure enough, it had died with blood flowing from all seven orifices.

"It seems to be successful, and the silencing charm is very effective." Anduin said to himself excitedly, but then realized that he hadn't made any sound. Only then did he realize that the effect of the silencing charm hadn't ended.

Seeing the condition of the experimental subject and confirming that the infrasonic charm had indeed worked, Anduin became bolder and decided to continue testing the effect of the 'Infrasonic Charm'.

But at this moment, Hagrid ran towards him and tried to say something to him. Anduin couldn't hear any sound at this time, so he had to quickly release the sonic repulsion charm on his body.

"What's wrong, Hagrid? I cast a spell on myself just now and couldn't hear you." Anduin could finally hear his own voice at this time.

"I wanted to say, I have to leave for a while. Dumbledore suddenly notified me and told me to go find him quickly." Seeing that Anduin finally responded, Hagrid quickly finished speaking, and then, carrying his little red umbrella, hurried towards the castle.

Anduin looked at Hagrid's hurried appearance and didn't know what had happened. He shook his head and decided not to worry about it. Anyway, after testing, this sonic repulsion charm was very useful, so he decided to continue the experiment.

What he didn't know was that tonight, an event that would change the entire British wizarding world had occurred.

At this time, Anduin was still happily testing his spell.

"It seems that the effect of the infrasonic charm will decay with distance. It will cause a very strong interference effect within ten meters. After more than ten meters, the rat will not die. Will it only be subject to some interference at a greater distance?" Anduin excitedly recorded the experimental data in his notebook.

After testing, the infrasonic charm would cause a strong kill within 5 meters, and the interference ability was also the strongest. The killing effect would be weaker from 5 meters to about 10 meters, and the interference effect was still good. After that, the farther the distance, the worse the effect. Anduin looked at the little rat 30 meters away, which was now only squeaking and running around nervously in its cage under the influence of the infrasonic charm.

"Humans are more resistant to sound waves. It seems that after more than 10 meters, the interference to humans will decrease even more?" Anduin kept summarizing.

After completing the experiment he had been thinking about, Anduin stretched contentedly. It was already close to midnight, and Hagrid had also been gone for a while. He didn't know what that guy was busy with.

Without thinking too much, he was very satisfied with tonight's experiment, as satisfied as if he had solved an advanced math problem that all the students in the class couldn't solve. He lay on the bed in a happy mood and slept soundly.

And shocking news appeared the next day.

The next morning was a weekend. Anduin and Charles, full of energy after their morning exercise, came to the castle hall, but at this time they found that the atmosphere in the hall was different from usual. Almost all the little wizards were not eating, but were discussing something enthusiastically. The sky was also full of owls, constantly delivering letters and newspapers to the little wizards.

"Anduin, Anduin, come here!" Vivian found Anduin and shouted at him.

"What happened? Why is everyone so excited?" Anduin asked in confusion.

"Oh my god, haven't you heard yet?" Vivian also said with a shocked expression at this time, "The Dark Lord has fallen. It is said that he was killed by a boy who survived! The Daily Prophet announced the news early this morning, and my family also sent a letter to confirm it."

"What?" Anduin was taken aback and snatched the newspaper from Vivian's hand.