尘之涟漪 (Author)

Originally titled "Professor Vampire Earl of Hogwarts"—— [Non-time travel text, no system] Dumbledore always thought that Voldemort was the greatest threat to the wizarding world, until a vampire who had lived for more than 1000 years came to him with the title deed of Hogwarts—— "The millennium has passed, and the lease of Hogwarts is…