After his conversation with Headmaster Dumbledore, Karl already had a clear and logical sequence of events.
Elvis Heller, who had been observing the magicStaircase, was very likely connected to the Wizard who called himself Merlin a thousand years ago.
Because the movement of the magic Staircase was regular and it was possible to find the magic core of the Castle, apart from the successive Headmasters of Hogwarts, probably only those who participated in its construction knew about it.
And that "Merlin" was also very likely related to Herpo the Foul; he might have helped Mr. Slytherin build the Chamber of Secrets and cultivated that Basilisk.
After all, if the method for cultivating a Basilisk was truly as simple as rumored, this monstrous creature wouldn't have been absent for several centuries.
Karl shared Headmaster Dumbledore's view, believing that when "Merlin" helped build Hogwarts Castle back then, he must have made some arrangements within the Castle's magic core, and this was Elvis Heller's ultimate goal.
Therefore, he knew about the existence and entry method of the Room of Requirement, and luring Karl into it to encounter Lord Voldemort's Horcrux was likely to divert Headmaster Dumbledore's attention.
As long as Dumbledore was drawn away from Hogwarts, Elvis Heller's actions would proceed very smoothly, as the other Professors were not privy to the Castle's secrets.
However, he didn't anticipate that Karl, from the very beginning, had seen through his identity as a Dark Wizard due to Fire Treasure, and also knew the location of Lord Voldemort's Horcrux, thus understanding his sinister intentions.
Moreover, through the unexpected actions of the Niffler, Daisy, he discovered Elvis Heller's connection to Herpo the Foul, and by searching for sealing spells and the Castle's magic core, he uncovered many secret stories, linking him to the "Merlin" of a thousand years ago.
"Which secret passage?"
The Weasley Brothers took out the marauder's map, opened it, and pointed out the location to Karl.
"Here, the one behind the mirror on the fifth floor, it eventually leads to Hogsmeade Village Village."
"We've taken it many times before; the space inside is incredibly vast, it hardly seems like a secret passage."
Karl recalled for a while before finally remembering the information about this secret passage.
This secret passage was supposed to collapse after the winter of 1992, and be completely blocked and abandoned in 1993.
The original story didn't explain the reason for the collapse, but now it seems highly likely to be related to Elvis Heller.
Could the Castle's magic core be located there?
Karl looked at the Weasley Brothers, "Can you lend me the marauder's map for a while?"
George: "Of course, no problem, but are you going to do something exciting? Can you take us along?"
Fred: "Is Professor Heller a Dark Wizard? Is he here to cause trouble at Hogwarts?"
Karl smiled slightly at them, "Of course, come on, let's go find Headmaster Dumbledore and Professor Snape right now to discuss what to do."
Weasley Brothers: (⊙﹏⊙)
"Never mind, Karl, we just remembered we have other things to attend to, so we won't accompany you."
"Exactly! You need to be careful! If you encounter danger, remember to make Professor Snape go first!"
After saying that, the two of them ran off immediately, not knowing whether Dumbledore or Snape had a greater deterrent effect on them.
Karl then found Charlie Weasley and Percy Weasley, falsely relaying Headmaster Dumbledore's instructions, telling them to keep an eye on their two brothers and prevent them from sneaking out at night again.
This wasn't him backstabbing George and Fred, but for the safety of those two live wires, to prevent them from encountering danger.
...
Easter was approaching, but the Young Wizards at Hogwarts had no anticipation for this holiday.
Because, as per tradition, Professors for all subjects would assign an exorbitant amount of homework, preparing in advance for the final exams.
Hmm... more than two months in advance.
This was no problem for top students, but for struggling students and those who were only superficially good, it was a nightmare.
They weren't afraid of exams, and even had the courage to fail, but the process of studying was too painful, especially with the hellish torment of a large amount of homework.
Many Young Wizards would ask Karl when they saw him: "Are there any other holidays coming up soon?"
They were worried about the upcoming open-book days and hoped for an excuse to relax then.
To this, Karl could only express regret, as Qingming Festival really wasn't suitable for parties.
So, during this period, the struggling students and those who were only superficially good began to seek a way out, and Summers became Cedric's sycophant.
It was said that even when he slept, he would hug Cedric's sturdy leg.
This rumor has now spread throughout Hogwarts, becoming the hottest gossip among the Young Wizards.
After all, while Summers was unremarkable, Cedric was definitely a campus heartthrob, a true hot topic.
Not only Little Witches participated in spreading it, but also some Young Wizards were very excited, which only goes to show that England has its own unique national conditions.
Cedric was so angry he almost killed Summers on the spot, and urgently clarified the matter in the Great Hall.
"I warn you not to speak nonsense! You are slandering me! Cho! They are slandering me!"
Cho, being very understanding, comforted him and took the opportunity to express her blessings.
Cedric: ┗( T﹏T )┛
It's not what they say! Listen to me explain! I'm innocent!
Watching Cedric, who had already cracked, Karl truly couldn't hold back his laughter—he was like a turtle on a school trip, unable to stay on campus.
He felt like the two police officers in the movie "The Mermaid," unable to tolerate even a little bit.
To prevent himself from laughing too loudly, Karl quickly diverted his attention.
"What are you looking at?"
Nina shook the newspaper in her hand, "The Daily Prophet, a lot of strange things have been happening lately."
Karl immediately put Cedric's matter aside, "Let me see."
Nina handed him the newspaper, "It's the reports in the very middle."
"Extremely Dangerous! A terrifying change is suspected to have occurred in the forests within Albania, with a large number of animals mysteriously dying."
"Outrageous! Evil grave robbers have appeared in Godric's Hollow, and some of the valley's graveyards have been severely damaged."
"Fear Returns? Numerous organized Dark Wizards have invaded Knockturn Alley, their heinous actions revealing the Ministry of Magic's incompetence."
"..."
After reading these reports, Karl had only one thought: It's here! Headmaster Dumbledore's conjecture has come true!
Elvis Heller truly spared no effort, using every means possible to lure Dumbledore away.
What do organized Dark Wizards make people think of? Of course, the Wizarding Party and Death Eaters.
And he really is using Lord Voldemort as a tool; as long as Dumbledore can be lured away, he doesn't care about Lord Voldemort's life or death.
The most crucial thing is...
Elvis Heller even dared to touch the graveyard in Godric's Hollow; has he gone mad?
It should be known that Dumbledore's mother and sister are both buried there; such an act is purely suicidal.
In terms of courting death, Karl would call Elvis Heller the strongest.
Next, it depends on what the Principal does.