Hogwarts: The Savior's Strong Cousin

Harry felt nervous. He immediately stood up and said to Hermione and Ron, "Professor McGonagall asked me to go to the dormitory immediately. It's an emergency."

Hermione and Ron looked at each other and stood up as well: "We'll go with you."

The three of them quickly rushed to the dormitory and saw Professor McGonagall standing at the door with a serious face. When she saw them coming, she immediately walked forward and whispered, "Professor Snape is missing."

Harry's heartbeat suddenly accelerated: "Missing? When?"

Professor McGonagall shook her head, "He didn't show up for the regular faculty meeting this afternoon. I went to his office looking for him, but he wasn't there. No one has ever seen him leave."

Hermione frowned. "This is not normal. Professor Snape is a very cautious person. How could he suddenly disappear?"

Ron also looked worried: "We have to find him, maybe he has some important information."

Professor McGonagall nodded, "I have informed the other professors, but there are no clues yet. Harry, I hope you can help find Professor Snape."

Harry took a deep breath and nodded firmly: "We will do our best."

In the next few days, Harry, Hermione and Ron began to look for Snape in every corner of Hogwarts. They checked Snape's desk, study and places he often went to, but found nothing. Harry's mood became heavier and heavier. He knew that Snape's disappearance might indicate a greater crisis.

One night, Harry was flipping through an ancient magic book in the corner of the library, trying to find any clues about Snape's disappearance. Hermione and Ron were also helping him. They all looked a little tired, but no one was willing to give up.

"Harry, there's a description of a concealment spell here," Hermione said, pointing to a passage in the book, "Perhaps Professor Snape used some advanced concealment spell."

Harry nodded, but his eyes were still full of doubt: "If that's the case, why would he hide himself? He must have discovered something."

Ron sighed: "No matter what, we have to find him."

Just then, a faint sound came from behind the bookshelf. Harry quickly stood up, raised his wand, and walked carefully towards the source of the sound. Hermione and Ron followed closely behind him, and they also drew their wands, ready to deal with any unexpected situation.

Walking to the bookshelf, Harry found a tattered note with a few lines of scribbled words on it: "Cyrus Knox, dungeon, midnight." Harry's heart tightened, and he immediately realized that this was a clue left by Snape.

"Look at this," Harry handed the note to Hermione and Ron, "This must have been left by Professor Snape, who discovered the trace of Cyrus Knox."

Hermione quickly read the note and her face turned serious: "We have to go to the dungeons immediately. We can't waste time."

Ron nodded in agreement: "Yes, Professor Snape may need our help."

The three of them quickly headed for the dungeon, their hearts filled with tension and uneasiness. The air in the dungeon was cold and damp, and there was an oppressive atmosphere all around. Harry held his wand tightly and walked in front, followed closely by Hermione and Ron.

"We must be very careful," Harry whispered. "Cyrus Knox may have set a trap here."

They moved forward carefully in the dungeon and finally found a closed iron door in a hidden corner. Harry felt his heartbeat quicken. He took a deep breath, raised his wand, and whispered the spell to open the door: "Aloho Open."

The iron door slowly opened, revealing a dark room. In the middle of the room, Professor Snape was tied to a chair, obviously seriously injured. When he saw Harry and his friends, a trace of surprise and gratitude flashed in his eyes.

"Harry," Snape said weakly, "you're here."

Harry quickly stepped forward and untied Snape, his heart filled with guilt and worry, "Professor, I'm sorry we're late."

Snape shook his head and forced a smile: "You came at the right time. Cyrus Knox planned to perform a black magic ritual here. Fortunately, you found my clue."

Hermione checked Snape's injuries and quickly cast a few healing spells: "Professor, you need to rest. We will protect you."

Ron looked around alertly to prevent any unexpected situations: "We have to leave here quickly, it's not safe here."

Just as they were about to leave, a deep laugh suddenly came from the shadows. Cyrus Knox walked out slowly with a grim smile on his face: "Harry Potter, do you think you can escape?"

Harry raised his wand, his eyes gleaming with determination: "Cyrus, your plot will not succeed."

Cyrus sneered, "Then try it, Potter."

Suddenly, the dark power filled the room, and a fierce magic duel broke out between Harry and Cyrus. Hermione and Ron also joined the battle to try to protect Professor Snape.

Harry felt the magic power surge in his body. He concentrated all his energy and chanted a powerful spell: "Expelliarmus!"

A bright light shot towards Cyrus, but he quickly dodged and shot back, "Avada Kedavra!"

Harry dodged, feeling horrified, but he knew he couldn't back down. He gritted his teeth and attacked again: "Stupefy!"

Hermione and Ron also tried their best to suppress Cyrus's dark magic with various spells. Professor Snape watched silently from the side. Although he was weak, he still tried to find the flaws in the battle.

The battle intensified, and Harry felt the magic power in his body gradually depleted, but he still persisted. At this moment, Professor Snape suddenly stood up from the ground, raised his wand, and chanted a powerful spell: "Protego Maxima!"

A huge protective barrier appeared in front of Harry and his friends, blocking Cyrus's attack. Harry felt a surge of warmth and strength, and he knew that this was Professor Snape using his last strength to protect them.

"Now, Harry, launch the final attack," Snape said weakly.

Harry gathered all his magical strength, raised his wand, and said loudly: "Expecto Patronum!"

A silver-white light burst out from Harry's wand, forming a huge deer-shaped Patronus, and rushed straight towards Cyrus. Cyrus was hit by this powerful force, let out a painful scream, and then fell to the ground and lost consciousness.

The battle was over, and Harry and his friends felt exhausted, but they knew that the threat of Cyrus Knox had finally been eliminated. They helped Professor Snape up and slowly walked out of the dungeon and returned to the safety of Hogwarts.