He read from the book for his sermons in the so-called Mystra's Sacred Trust rite held at the temple. Essentially, in it, he claimed that, as shown on Mystra's holy symbol, magic was born between the stars, with the stars themselves being the known points or schools of magic, and that the space between contained far more secret magical knowledge that Mystra would only reveal to the most promising.
Full of religious iconography and symbology, the book was very difficult to follow, even incomprehensible, being as it was written by a madman. In fact, Starweaver Fembrys was a false priest, a cleric of Shar who employed the Shadow Weave.
It was a large tome bound in black leather, with the cover bearing an illustration of seven stars.