Anthropodermic bibliopegy (binding books in human skin) is an ancient satanic practice.

For example, a 500-year old textbook of instructions on homosexual rape, known as the Le traicté de Peyne: poëme allégorique dédié à Monseigneur et à Madame de Lorraynne bound in human skin, is in the collection of the Grolier Club in NYC, a masonic lodge masquerading as a book club.

Another- the Dance of Death- is a series of poems and paintings celebrating death and murder, and is held by the Ivy League University with occult connections, Brown University, in Rhode Island.

Occultist Brown University holds two other more recent volumes bound in human skin, De Humani Corporis Fabrica Libri Septem, a textbook for vivisecting humans, and Mademoiselle Giraud, My Wife, a textbook encouraging mental breakdown and suicide.

https://en.wikipedia.org/wiki/List_of_books_bound_in_human_skin

But I'm sure that's just a co-incidence

So the normies will tell you this is a Halloween prop, but don't believe them.