All Magic Is Chinese Characters

Roy transmigrated, but he didn’t leave Earth. Not to the past, but to the future. In this “future,” which resembles medieval Europe, priests wield a strange kind of magical script. Yes, Chinese characters! Write a passage in Chinese on a sheet of paper and fold it into a plane, and it can pierce any armor. That’s freaking amazing... or not! Can someone tell me who twisted this world into such a bizarre place?