Hogwarts: The Savior's Strong Cousin

"It's the book 'Dark Origin'," said Professor McGonagall. "Harry, go get it. I will protect you here."

Harry nodded, leaped up, waved his wand, and the book slowly floated down. He carefully took the book and felt that its cover was unusually cold, as if countless magical powers were flowing inside.

Just as he was about to return, suddenly, the bookshelf shook violently, as if the entire library was shaking. Harry and Professor McGonagall felt a powerful force approaching at the same time.

"Go!" Professor McGonagall shouted, "It's dangerous here!"

Harry quickly followed Professor McGonagall to the exit of the library, but just after they took a few steps, a dark shadow fell from the sky and blocked their way. It was a huge magical creature, covered with black scales, with a fierce light flashing in its eyes.

"It's the Guardian!" cried Professor McGonagall. "We must fight it off!"

Harry held his wand tightly and fought side by side with Professor McGonagall. Together, they cast powerful magic to try to repel this huge magical creature. The battle was extremely fierce, and the magic light intertwined in the air, bursting into dazzling light.

Harry felt that all his magic power was almost exhausted, but he knew he could not retreat. He concentrated all his strength and cast a powerful spell, finally repelling the magical creature.

"Hurry up!" Professor McGonagall shouted, and they continued to run towards the exit of the library and finally left there safely.

Returning to Professor McGonagall's office, Harry felt exhausted, but he knew that finding "Dark Origin" was only the first step. They had to unlock the secrets in the book and find an effective way to fight against the dark magic.

Professor McGonagall opened the book "Dark Origin". The text in the book was ancient and obscure, but she and Harry studied it word by word. Every page was full of mysterious symbols and spells, as if telling an ancient and dark story.

"Harry, this book records a lot about the origins and methods of dealing with dark magic," said Professor McGonagall, "but we need more time to decipher it."

Harry nodded, his heart full of determination. He knew that the road ahead was still full of challenges, but he would not back down. He would continue to work hard, together with his friends, to protect Hogwarts and defeat the power of darkness.

Just then, Hermione and Ron walked into the office, looking worried.

"Harry, we just received news," Hermione said, "It seems that more dark magic marks have appeared at the borders of Hogwarts. We must find a solution as soon as possible."

Harry sat in Professor McGonagall's office, holding the book Dark Origin tightly in his hand, thinking back to the fierce battle in the library. He could feel the powerful dark magic still hovering around Hogwarts. Although he had just experienced a fierce battle, he knew that the real challenge was still to come.

Professor McGonagall looked at Harry with a hint of worry in her eyes. "Harry, we must discuss how to control and use these ancient magics. They are very powerful and very dangerous. If used improperly, not only will they fail to protect Hogwarts, but they may bring even greater disasters."

Harry nodded, knowing that the professor was right. He felt the pressure on his shoulders increasing, but he also understood that only by mastering these magics could he effectively fight against the threat of dark magic.

"Professor, I feel that these magics are different from what we have learned before," Harry said, with a hint of doubt in his tone, "They seem to have their own will."

Professor McGonagall sighed, "Yes, Harry, these ancient magics are indeed like that. They are not just tools, but more like living beings, connected to your mind and will. If you cannot fully control them, they will in turn control you."

Harry took a deep breath and felt a surge of nervousness in his heart. "So what should I do? How can I really control these magics?"

Professor McGonagall pondered for a moment. "First, you need to understand your own heart. You must clearly know your beliefs and goals. Only in this way can you avoid being confused by the power of magic. Secondly, you must learn to establish a connection with magic, feel its existence, and gradually guide it to work for you."

Harry nodded, and his mind slowly began to clear up. "I understand, Professor. I will try my best to master these magics and not let them control me."

Professor McGonagall smiled and said, "Very good, Harry. I believe you have the ability. Now, let's study the contents of this book and see what useful information we can find."

The two opened "Dark Origin" and studied every page carefully. The spells and symbols in the book were complex and mysterious, but with the help of Hermione, they gradually unraveled some of the secrets.

"Harry, there is a spell here that seems to be able to strengthen the protective barrier of Hogwarts," Hermione pointed to a passage in the book and said, "but this spell is very complicated and requires very powerful magic."

Harry looked at the spell with a sense of trepidation. He knew he had to try, but he also knew that any mistake could lead to disastrous consequences.

"I'm willing to try," Harry said firmly. "I'm willing to pay any price to protect Hogwarts."

Professor McGonagall nodded, "Okay, Harry. We will support you fully. But you must be very careful to make sure every step is correct."

Harry took a deep breath and began to concentrate, preparing to cast the complex spell. He felt the magic flowing through his body, as if it had merged with the entire magical barrier of Hogwarts.

As Harry's spell gradually sounded, magic symbols flashed in the air, emitting dazzling light. The whole office was surrounded by strong magical energy, as if in another world.

Harry felt the magic power in his body being constantly drained away, and sweat oozed from his forehead, but he gritted his teeth and continued to chant the spell. He knew he couldn't stop and had to complete the entire spell.

Suddenly, the whole of Hogwarts shook as if the ground was roaring, and Harry felt a powerful force burst out of him and quickly spread throughout the school.

"Hold on, Harry!" Professor McGonagall encouraged, "You're doing great, you're almost done!"

Harry concentrated all his willpower and finished the last spell. As the last symbol disappeared in the air, a dazzling light shot up into the sky, and the entire Hogwarts was shrouded in a powerful magical barrier.

Harry felt weak all over and could hardly stand. But he knew that he had succeeded. He used up his last bit of strength and smiled.