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Karl Spiesberger (29 October 1904 - 1 January 1992) was a German mystic, occultist, Germanic revivalist and Runosophist. He is most well known for his revivalism and usage of the Sidereal Pendulum for divination and dowsing and for his anti-racialist stance and revivalist usage of the Armanen Futharkh runic system after the second world war, removing its negative connotations. During his involvement with the Fraternitas Saturni Spiesberger was also known as Frater Eratus. Under this name he published several articles in the Blätter für angewandte okkulte Lebenskunst.
Since his earliest youth Spiesberger was interested in occultism and hypnosis. In May 1932 he moved to Berlin to attain a career as an actor. In 1935 he met the then already well-known magician and occultist Gregor A. Gregorius, whom in 1928 founded the Lodge "Fraternitas Saturni" and came into close contact with him. Later he became one of its best-known members He worked intensively with the magical use of the Armanen Futharkh runes. When this came in conflict with the Nazi regime he turned to other occult themes, such as the magic of the spheres and the ancient books of magic (Grimoires). When Gregorius reorganised the FS after the war in 1950 Spiesberger became a prominent teacher in the Berlin Lodge (Orient Berlin) of the FS. In the same time, he devoted himself to writing. In 1960 he withdrew from the lodge for unknown reasons. He died in the age of 87 in Berlin and is also buried there.
Rune Magic 
Due to the Nazi suppression and imprisonment of "non-authorised" or "non-officially sanctioned" runic/Germanic mystics and revivalists and their respective organisations during the Third Reich (see Nazi mysticism) the runes were so closely associated with the Nazis that the use and discussion of them in academic as well as esoteric circles was hampered by adverse public opinion. Those of the old rune magicians and occultists who had survived the war in Germany, slowly began to make their way back to their work, and new voices were also heard. The best known of these new voices was Spiesberger.
After the war the Armanen system was revived, and "reformed" by Spiesberger. Spiesberger was a widely qualified, "eclectic" occultist who has authored books in the hermetic as well as the runic tradition. His two principle works on runic topics are Runenmagie: Handbuch der Runenkunde (1955) and Runenexerzitien für Jedermann (1958). In these books he synthesises the work of all the German runic magicians and experts who preceded him, within a pansophical framework. Although he eliminates all the racist and völkisch elements, he retains the Armanen system of runes, which by 1955 had become almost traditional in German circles.
Spiesberger's works were always cast in the 18 rune Futharkh (the Armanen Runes) as originally envisioned by Guido von List and magically developed by Siegfried Adolf Kummer. Both were proponents of the Armanen Runes. What Spiesberger essentially tried to do was remove the "racist" aspects of the Armanic and Marbyan rune work and place the whole system in a pansophical, or eclectic, context. To Guido von List, Friedrich Bernhard Marby, Siegfried Adolf Kummer and Rudolf John Gorsleben, the runes represent the key to esoteric understanding. To Spiesberger, they were just one more tool to be used by any individual magician.
After the war he also wrote Der erfolgreiche Pendel-Praktiker  published in 1963. Although still far more readily available in its original German text, it is now also available in its 1989 English translation entitled Reveal the Power of the Pendulum. In this book about pendulum dowsing, he refers to the Odic force.
Like most authors on esoteric or magical subjects, he presents a mixture of the old with some original innovations of his own. To some extent the innovations may have been drawn from the eclectic teachings of the Fraternitas Saturni.
Selected works 
Karl Spiesberger has written many works.
- Runenmagie, 1955
- Runenexerzitien fur Jedermann, 1958
- Unsichtbare Helferkräfte, 1960
- Reveal the Power of the Pendulum: Secrets of the Sidereal Pendulum, A Complete Survey of Pendulum Dowsing, 1962. ISBN 0-572-01419-8
- Praktische Telepathie, 1966
- Runenmagie Handbuch der Runenkunde, 1968 (R. Schikowski-Verlag, Berlin)
- Das Mantra Buch, 1977
- Telepathie Die Macht des Überbewußten, 1982. ISBN 3-87702-071-2
- Die Aura Des Menschen: Wie die Aura sichtbar gemacht werden kann und was ihre Farben bedeuten, 1987
- Secrets of the New Age: 4 Complete Books, 1989
- Antiquario - Handelsplattform für antiquarische Buecher
- Reveal the Power of the Pendulum: Secrets of the Sidereal Pendulum, A Complete Survey of Pendulum Dowsing ISBN 0-572-01419-8, it was published in England 'W. Foulsham & Company Limited.'
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