Type-moon's Winter Saint

Type-Moon world, the moon, Fate. Having traveled to the Einzbern family, Luo Zhen became the heir to the Third Law, known as the Son of Winter. So, let's just say he's the Son of Winter. It might be a bit childish, but a magus has to be childish! So he's meticulously planned, preparing to reign supreme in the magic world for generations to come. He's going to punch Tōsaka and step on Matou, and let that Mapo priest taste the pain of disembowelment himself—Fujimaru Ritsuka: "Second Master, I've found it! The culprit behind the singularity is here!" Luo Zhen: "...╮( •́ω•̀ )╭?" So I'm taking the Lostbelt route? ???