The Key of Solomon Concerning the Holy Pentacles is a book written by S. L. MacGregor Mathers. It is a translation of a medieval grimoire, or magical textbook, that details the creation and use of talismans known as pentacles. The book is divided into two parts. The first part provides instructions on how to create the pentacles, including the materials needed and the proper timing for their creation. The second part provides instructions on how to...