In the corners of Hogwarts, screams of terror were heard one after another. More and more poisonous snakes appeared like ghosts, and innocent students became their targets.

Those who were bitten fell down one by one and fell into a long coma. The whole academy was shrouded in unknown fear.

In the magical world of this century, even the great white wizard Dumbledore and the unrivaled potion master Snape were at a loss when faced with these mysterious venomous snakes.

This strange species of snake has no trace in wizard history, and not even a single word about it can be found in thick magic books.

"What the hell is this?" Hogwarts students discussed privately.

And in the center of this chaos, there was a person hiding in a dark corner with a smug smile on his face.

Segnus squinted her eyes and tapped the ground lightly with her toes. She knew clearly in her heart that the mastermind of this farce must be that guy - Chi He.

"Oh, look at this," she said to herself, with a hint of sarcasm in her tone, "Why is it a snake? What else could it be except that reason?" She turned a ring, her eyes deep, as if she saw through all the secrets.

She continued to murmur, "He teamed up with Tom Riddle. Both of them have minds more complicated than spider webs. If they hit it off, how could Hogwarts not be in chaos?"

"Signus, someone is calling you in the cellar!" Pansy rushed in from the door with a bunch of messy things in her arms.

Segnus, who was busy tidying up the table, heard this, his eyes rolled and a sly smile appeared on the corner of his mouth.

She gently brushed the dust off her hands, as if the busyness just now had never happened, and walked gracefully towards the exit of the Slytherin common room.

At the entrance of Slytherin, Harry was as anxious as an ant on a hot pan. He kept looking inside until the familiar figure appeared - Cygnus.

A smile of relief immediately broke out on his face, and he hurriedly trotted over to meet him.

"Cygnus, Cygnus!" Harry's voice was full of urgency, "I knew you would come! Ron was bitten by that disgusting snake and is now lying there unconscious. You have to help me think of a solution. You always have a solution, right?"

Harry was so anxious that he was running around in circles. In contrast, Cygnus was calm and composed. She gently touched the hair beside her ear with a calm look in her eyes.

"Harry, even Headmaster Dumbledore is helpless. Do you really think I have any magic that can solve this problem?"

When Harry heard that, his shoulders immediately slumped, and the light in his eyes was instantly extinguished, as if all hope had been ruthlessly extinguished.

Seeing this scene, Segnus raised a sly smile and spoke with a hint of teasing in her voice:

"Harry, don't act like it's the end of the world. I do have a way to save him, but you have to understand that there is no such thing as a free lunch."

Harry's eyes suddenly lit up, as if he had found a ray of light in the darkness. He responded eagerly, almost saying in one breath: "Segnas, as long as Ron can be saved, I will agree to any condition!"

"Relax, Harry, I'm not going to give you any big assignment."

Cygnus smiled slyly, her eyes sweeping across Harry's face, "Meet at 10pm on the eighth floor, under the tapestry of 'Troll Beating Stupid Barnabas'."

Before she finished her words, her figure floated towards the dark entrance of the Slytherin common room.

Harry stood there, his brows furrowed, and a wave of emotion surged in his heart.

He paced back and forth, pondering the intention behind Cygnus's words.

A few minutes passed, his eyes became firm, and he seemed to have made some kind of determination. Then he turned around suddenly, taking decisive and heavy steps.

Cygnus walked lightly back to the Slytherin common room.

As soon as she entered the room, her eyes fell on Theodore who was sitting quietly on the sofa.

He held a glass of milk in his hand and looked at her quietly, with endless tenderness in his eyes.

"Theodore, what are you doing here?" A sly smile appeared on Segnus' lips. As he walked towards him, he was calculating his own plans in his mind.

Theodore still sat calmly, following her movements with his eyes, "I'm waiting for you, Segnus. I've prepared some milk for you. Drinking some milk before going to bed will help you sleep more comfortably."

"Oh, Theodore, that's very sweet of you." Segnus was about to take it.

"Are you going out again?" Theodore asked with a smile, a hint of imperceptible doting in the corners of his eyes, "Then it seems that this milk needs to be cooled for a while. Let me accompany you. How about going out together?"

Theodore's pleading eyes were directed towards Cygnus, and the corners of her mouth rose slightly, revealing a knowing smile.

"Well, let's go together," Cygnus replied, her voice holding a secret that only she knew.

As the night deepened, the bell of Hogwarts Castle struck ten times. All around was quiet, even the portraits that usually loved to whisper fell silent.

The dim candlelight flickered, shining on the face of the portrait, creating an eerie and mysterious atmosphere.

The two people who drank the invisibility potion walked side by side to the eighth floor of the castle, and their footsteps echoed in the empty corridor.

When we reached the eighth floor, Harry's figure had already appeared in the dim light. He had obviously been waiting for a long time and was pacing anxiously.

As Harry turned around, a magnificent gate suddenly appeared before his eyes.

He was stunned, his face full of confusion, and at this moment, Segnus came quietly like a ghost.

"Hey, Harry!" Cygnus' voice had a hint of cynicism in it, which made Harry jump involuntarily.

Theodore watched from the side, while Harry said nothing, unable to hide his surprise on his face.

"Come on, boys, don't just stand there." Segnus' tone was relaxed, but his eyes revealed a sense of command.

Harry walked into the heavy door in a daze, and saw a formally decorated conference room before him.

Theodore was familiar with such occasions. He walked to the left side of the front of the room without hesitation and sat down.

His eyes followed her everywhere, fixed firmly on Segnus.

Cygnus walked lightly to the carved wooden chair in the center of the room, her steps revealing an unquestionable majesty.

She sat down gracefully, her hands resting on the arms of the chair, and her beautiful eyes looked at Harry through false enthusiasm.

"Come on, Harry," her voice was soft but commanding, "take a seat."

Harry did as he was told, feeling very nervous and cautious.

Segnus smiled, a smile that held a secret only she knew.

"You see, we have to establish some boundaries," she said, her tone as casual as if she were talking about the weather. "You need to complete a small ceremony with me, so that you can prove to the world that you, Harry, will always be my loyal servant."

Harry's Adam's apple rolled and he swallowed visibly. At this moment, his inner struggle surged like a tide.

He was indeed irresistible to Cygnus's beauty, but that was simply out of a man's instinctive appreciation of beauty.

"Harry, you have to think carefully. This is not like your usual adventure games." Cygnus' voice was like a sting hidden in honey, sweet but extremely dangerous.

Harry took a deep breath, his fingers unconsciously tightening around the arms of his chair.

Finally, he raised his head firmly, with determination flashing in his bright eyes.

His words were as strong as iron: "Okay, I do."

"Then let's get started, don't waste time." Segnus shrugged, raised her wand, waved it gently, and a dazzling light flowed out from the tip of the wand.

Harry clenched his teeth, trying to hold back the pain that was about to surge up. His brows were furrowed and beads of sweat appeared on his forehead.

At this moment, he suddenly felt a stinging pain in his collarbone, as if thousands of ants were gnawing at his skin.

"Hiss—" Harry couldn't help but gasp, he felt something spreading on his skin.

It was a pattern of vines entwined with roses, which seemed to have life and were slowly growing on his body.

"Well, it seems to be working well." Segnus said to herself, with a hint of excitement in her eyes.

The pattern shone with a pale golden light, flowing on Harry's skin like a living thing, as if tiny stars were dancing in it.

This is not an ordinary mark, it is a mark of the soul, deeply engraved in the depths of Harry's soul.

Why did Segnus know such a secret technique? Even she herself seemed to be unclear.

This method was like an innate talent that flowed naturally in her blood.

Harry's features were distorted in pain, and he stumbled to the ground, his face as white as paper.

Theodore on the side watched coldly, his cold blue eyes calm and without any mercy.

"Signus, what about me?" he finally spoke, with obvious dissatisfaction in his voice.

Theodore was very unhappy that Cygnus had ignored him alone and had not left that mark on him.

Despite Cygnus's protestations about how much she trusted him, he insisted that Cygnus leave the same mark on him.

Segnus shook his head helplessly, and waved the wand in his hand lightly, leaving a mark on Theodore's body.

Theodore's body trembled in pain, his face instantly lost color, and he staggered and fell on one knee in front of Segnus, but he still gritted his teeth, trying to maintain the last bit of dignity.

He gritted his teeth and beads of sweat appeared on his forehead.

The same mark was faintly visible on his collarbone, hidden by the dark green Slytherin robes.

Cygnus smiled slyly, leaning slightly to the side, her eyes moving between the two of them, savoring the surge of faith she felt.

The corners of her mouth curled up in a smug arc, but she was sneering in her heart - she was not a god, but she could hold the piety of these ignorant believers in her hands and absorb their strength like playing with chess pieces.

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