Nie Mengyun was an orphan who lived in an orphanage. Because of a congenital heart condition, no one ever adopted her. Her happiest times every day were spent reading Harry Potter, and every night she went to sleep hugging a body pillow of Snape. Daydreaming constantly, she wished she could travel to Spinner's End and have a fateful encounter with Snape. She believed they were both lonely souls, and because of their loneliness, they would naturally be drawn to each other.
Perhaps the heavens heard her prayers. On her eighteenth day of birth—her eighteenth birthday—she suffered a fatal heart attack and crossed over into a world combining Harry Potter and another comic. Here, she was the Child of Darkness, the last Noah in the world, raised by Bidodo, an old house-elf of the Walker family. Her parents had both passed away before she was even a year old. If the bloodline of the Noah did not awaken, she would inevitably perish before turning thirty.
Rhea Walker was Nie Mengyun's name in this lifetime. She was born into the Noah Family, a lineage cursed by the gods. The exact moment she crossed over was January 9, 1990, her tenth birthday, which was the day of the Noah awakening. (The original soul had failed to awaken and thus perished, while her parents had refused the awakening ritual in their desire to let her live an ordinary life.) The Noah awakening took place amidst a dark Hexagram. Bidodo watched as her young master's shoulder-length brown hair turned raven black, while ten black Hexagrams flashed briefly across her forehead. Her ice-white skin was like delicate porcelain, and her slender figure was as elegant and captivating as a black rose blooming in a garden. Bidodo burst into tears of overwhelming emotion, thinking that at last, she would never lose her master again, and that she would stay with Miss Rhea forever. The ancient Walker family welcomed its new head. After receiving the inherited memories, Rhea stiffly hugged Bidodo. She knew what this old elf meant to "her," and she thought that this was an experience she had never had before. "Family" was such a strange concept, yet Rhea did not dislike it. The stirring in her heart told her that the original soul had not completely dissipated, and she silently said to her, "I will help Bidodo awaken her dark elf bloodline so she can live forever. Family means being together forever, so please rest assured, Rhea." At that moment, the fusion of body and soul felt so comforting to Rhea that she almost let out a moan. It seemed as though she saw a cute porcelain doll smiling at her and whispering, "Thank you."
"Bidodo, go to the vault and get the root of the Dark Dragon Snake, the eyes of the Demonic Dragon, and the broken wings of the Dark Angel. I will awaken the dark elf bloodline for you."
"Oh heavens, can Bidodo do this? Miss Rhea, these materials are far too precious. Bidodo is already doing just fine."
"It's nothing, my dear Bidodo. Go ahead. Don't you want to stay with me always?"
"Bidodo wants that more than anything. I'm going right now, Miss Rhea."
When Bidodo returned from the vault with the materials Rhea requested, Rhea had already finished carving the ancient Hexagram array. Taking the sacrificial materials, Rhea had Bidodo stand in the center of the Hexagram array. Using her soul to chant the whispers of demons, she tossed the three items into the center of the array just as a shroud of black fog descended. When the black fog cleared, Bidodo in the center of the array had grown younger, her eyes had changed from gray to black, and she was wearing a black dress. Bidodo had gained eternal life, but she had also bound her soul to Rhea Walker in a contract. Unlike other house-elves who would be freed if their master gave them clothes, Bidodo would forever remain Rhea's servant—though Bidodo was more than happy to accept this willingly.
"Bidodo is endlessly grateful to Miss Rhea! Bidodo has no words to describe how she feels right now. Bidodo has grown younger, and this feeling is truly wonderful."
"As long as you're happy. Bidodo, help me pack my things. I'm going to leave the manor and make a trip to Hogwarts. Hopefully, I'll be lucky enough to run into him."
"Understood, Miss Rhea."
Bidodo quickly finished packing, and Rhea instantly teleported into Mr. Dumbledore's office. Dumbledore was already holding his wand, ready to strike at a moment's notice, but upon seeing an unthreatening child of around ten years old, he temporarily lowered his Elder Wand.
"Dear young lady, how may I help you?" Dumbledore asked calmly, though only he knew how tense he was inside.
"Dear Mr. Dumbledore, hello. Please don't be alarmed. My name is Rhea Walker. I am making this unannounced visit with absolutely no ill intent, I assure you." Rhea gave Dumbledore a formal aristocratic bow.