NB: Nullum Experimentum de Spiritibus potest fieri sine Circulo praeparation ut in arte continetur*.
Magical Circle according to the Art of Drawing Spirits into Crystals attributed to Trithemius.
Size: 6,5 ft x 5,73 ft (1,98m x 1,78m)
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* No magical operation with spirits should be made without an enclosed Circle prepared according to the rules of the art.