C106(1)

"Tom, the person you are talking to has changed. I am not like Ginny Weasley. If you don't give me anything useful, I will destroy you outright."

Kain picked up the quill pen and wrote this sentence in the diary. Not long after, a reply appeared, the words seemingly tinged with a sense of grievance.

"I will help you. This is my duty. I was created with a mission—to assist anyone who possesses me."

Kain didn't waste time with pleasantries and wrote directly in the diary:

"What is the principle behind Obliviate? What are the dark magic curses? What is the spell that allows wizards to fly into the sky?"

These were the spells Kain didn't fully understand. Many of them involved countering dark magic, but what intrigued him the most was the flying magic often used by Death Eaters.

Dumbledore and the Order of the Phoenix seemed capable of it as well, but Lupin hadn't taught him the spell. Left with no other options, Kain decided to probe Tom.

The flying magic used by the Death Eaters could rival the speed of a Firebolt, reaching up to 240 kilometers per hour. It was incredibly convenient and, as far as Kain could tell, had no apparent drawbacks.

After jotting down a long list of questions, Kain watched as answers slowly appeared in the diary. He quickly transcribed them.

"Tom, you insidious fellow, how dare you lie to me!"

Tom's evasiveness made Kain suspicious. To ensure compliance, he conjured a small burst of Fiendfyre at his fingertips and let it burn under the diary.

"No! I didn't lie to you. These answers are all true. Please stop! Don't burn me again!"

"Stop? You're clearly lying to me. I'll make sure you understand the consequences of deceit. Let's see if you dare to lie to me again."

With that, Kain conjured another cluster of Fiendfyre, intensifying the flames. Now, Tom truly panicked. This diary wasn't invincible; the Fiendfyre was powerful enough to harm him. 

If not for the protective spells he had placed on the diary, it would have been reduced to ashes already.

"I never lied to you. Please believe me—I exist only to serve."

"I'll trust you for now," Kain wrote, "but tomorrow, I'll confirm your answers with a dark wizard. If I find any lies, get ready to spend eternity in a dung heap ignited with Fiendfyre."

Satisfied with the damage he had inflicted, Kain extinguished the flames. He planned to try the flying magic later and, if it proved unsatisfactory, burn the diary again.

Tom still retained some of his manipulative power, evident in his sporadic and hesitant replies. Kain resolved to extract every bit of magic knowledge Tom possessed before deciding his ultimate fate.

After storing the diary away, Kain headed toward the Restricted Section of the library.

Kain didn't have any classes the next morning, which meant he could stay up all night studying magic. As he made this decision, he couldn't help but feel surprised at himself. 

In his previous life, he had hated studying more than anything and never imagined that one day he would work so hard to learn.

…

"When facing a dark wizard, you must act faster than your opponent. Dark wizards have no boundaries and are not restrained by the Ministry of Magic. If you hesitate, you'll find yourself disarmed or writhing under the Cruciatus Curse!"

When teaching senior students, Kain always emphasized the mindset of their opponents. Half the class was dedicated to understanding the strategies and mentalities of dark wizards, while the remaining time was spent practicing spells against various dark magical creatures. 

Much of what he taught had been gleaned from Lupin, but Kain's own proficiency in magic allowed him to demonstrate more effective casting techniques.

However, Kain's method of spellcasting was almost instinctive, making it hard for him to explain it in detail. 

In this regard, more experienced professors like Snape or Lupin were better at teaching. Even so, Kain's lessons stood out for their innovative approach—he was one of the first professors to encourage students to take the initiative in combat.

During one class, after Kain had finished speaking, a fifth-year female student raised her hand.

"Professor, why are we focusing so much on vigilance against dark wizards? Shouldn't we also be learning about dangerous magical creatures?"

Kain nodded. "That's an excellent question. Tell me, which department has the most staff in the Ministry of Magic?"

"The Department of Magical Law Enforcement!" a student answered quickly, as it was an easy question.

"Correct," Kain said. "The Ministry of Magic exists to protect the British wizarding world, and its primary concerns are dark wizards and dangerous magical creatures. But between the two, dark wizards are far more dangerous. That's why the Ministry devotes so many resources to combating them."

"As for magical creatures, while they're certainly a threat, wizards have already fought and won several large-scale battles against them. Over time, we've tamed the most dangerous ones, studied their weaknesses, and documented our knowledge in books."

"But dark wizards are different. Each one has their own methods, tactics, and unpredictability. Take this as an example—Franco, your spellcasting is still too obvious. If you concealed yourself behind someone , your attack would have been harder to detect."

As Kain spoke, he casually deflected a Petrification Charm with a flick of his wand, drawing gasps from the students.

The ease with which he blocked the spell left them stunned. Most hadn't even noticed Franco's silent casting—an advanced skill that only a few senior students had mastered. 

Yet, without even looking in Franco's direction, Kain had neutralized the spell as though it were nothing.

….

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