HP: The Root of Everything - The Magician

(No system, not a wish-fulfillment story, not mindless, reasonable setting, borrows some plot from the original work)... Question: What is victory for a magician? Answer: To abolish all fixed ideas and obstacles, and only focus on achieving the ultimate goal. No owls, no Hogwarts acceptance letters. At seventeen, Teach Carr, an assassin, unexpectedly brushed past Harry Potter, who was preparing to buy his school application materials, after completing a mission. He then forced his way into the wizarding world, completed his magic circuits, and created the Holy Grail. First hunted by the Ministry of Magic, then rejected by Dumbledore, he ultimately became an enemy of the entire wizarding world. ...