Preparing for the Sacred Trust was a book written by Starweaver Deinyn Fembrys, a priest of the Temple of Mystra in Wheloon in the Year of Lightning Storms, 1374 DR. 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.