Travel Through Hogwarts and Create the Witcher Academy

Chen Qian, who accidentally obtained the badge of the Wolf School, discovered after traveling through time that this world was full of monsters and devastated. He thought he had traveled to the wizarding world, until he met the young Ravenclaw, and then he realized that this was actually Harry Potter! And he traveled back thousands of years! When others learn magic, he applies sword oil; when others wave their wands, he uses his seals. When Gryffindor and Slytherin were arguing about whether to recruit Muggle-born students, Chen Qian silently slapped the steel and silver swords on the table and hung the fifth courtyard flag in the most conspicuous place in the castle. The fifth school of Hogwarts, the Witcher School, was officially established. The house of lions represents bravery, the house of snakes represents ambition, the house of eagles represents wisdom, and the house of badgers represents loyalty. And the Wolf Court only represents one thing. When darkness strikes, they are the first in the entire castle to draw their swords!