Activating the mirror beacon, Zelda says in French, "Reviens à moi, sang de mon sang" = "Come back to me, blood of my blood."
The long-sought Binder turns out to be a book with BINDER written on its spine. A book is manufactured by gluing or sewing together the edges of many sheets of paper - this is known as bookbinding, and the binder is the spine of that book.