Trithemius is best known for his hidden writing- the infamous Steganographia, but his other works, including this short grimoire on the use of crystals in summoning celestial spirits, are no less potent. Through the use of a simple wand, pedestal, lamen, and a polished and clear crystal, Trithemius states that it is possible to manifest and converse with celestial forces and to constrain them through the use of simple invocation and prayer.
Johannes Trithemius (1 February 1462 – 13 December 1516), born Johann Heidenberg, was a German Benedictine abbot and a polymath who was active in the German Renaissance as a lexicographer, chronicler, cryptographer, and occultist.