Chen Yu was calm. During his battles with demonic hybrids, he had slaughtered countless demons, so skinning was really nothing to make a fuss about.
However, the issue of how to turn this piece of human skin into a book did give Chen Yu some headaches. Fortunately, Radiance had recorded some details of the original human skin book, so Chen Yu started to craft a book himself, stitching it together, and then wrote the demon language he had seen before. Chen Yu was not worried that this would attract the attention of the Blood King, who wasn't so idle. To catch the Blood King's notice, sacrificing the whole of New York would probably be the minimum required.
So, Chen Yu quickly wrote the content he had seen on that page into the book. Then he smeared some black ash he had gotten from Andrei over it, making it look ordinary and unremarkable. Placing the book on a table, Chen Yu then took out his mobile phone and logged onto a website to post his message.