Black Abbot White Magic by Frater Acher
In Black Abbot · White Magic: Johannes Trithemius and the Angelic Mind, the second volume of the Holy Daimon cycle, Frater Acher focusses on the magical legacy of Johannes Trithemius and gives an understanding of the intent, depth and pragmatism of 15th century mystico-magical practice and of its most engimatic figure.
Paperback edition