Crowley adapted Liber Samekh from the Greek Magical Papyri's V.96—172, in which Akephalos (The Headless One) is invoked. The PGM passage is known as the The Stele of Ieu. It is used by modern Hermetic Arts Practitioners as a means to contact one's Holy Guardian Angel, and there are a plethora of modern experience reports from those who have performed it.
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