Hogwarts, My Sister Is Hermione

Traveling through the world of Harry Potter, he became Hermione's twin brother. Originally, Louis only wanted to hug the thigh of his sister, the future Minister of Magic. At this moment, the system rune system appeared. He can use his magic to carve runes! The carved runes can also be engraved on various armors and wands! In the following time, Louis continued to improve his strength and proficiency in engraving runes. In this way, he improved himself unknowingly. In addition, he and his sister Hermione have been "relaxing" in Hogwarts. It took him 5 years. So, when Voldemort returned and the entire magical world was panicked, everyone discovered. There is an additional "Rune Item Shop" in Diagon Alley. Voldemort: "What the hell? Why can't even a common wizard kill Avada Kedavra?" Louis: "Of course it's because of the blessing of defensive runes! The cloak is engraved with level 5 defensive runes!" "For only 1999 Galleons, you can take home a cloak that can withstand three times of the Death Curse among the three unforgivable curses!" "Of course, if you are short on money, there are also protective gears blessed with low-level defensive runes." "What are you waiting for? If you want to buy it, hurry up!" When the news came out, the entire magic world went crazy!