Shinden Yaguruma no Ho or “The Art of the Divine Transmission Arrow Vehicle“ is a magic ritual from the 1700s scroll “Koka ryu Ninjutsu Densho“ by “Konyo“. The magic is for invisibility, and was considered very important in this particular school. From the book, “Secret Traditions of the Shinobi“ by Antony Cummins and Yoshie Minami.