The Unexpected Heir
The Holy Writings are the collected works of the Prophets of the Church of Asthorn. Once a Prophet is declared, they are forbidden from writing anything but their portion of the Holy Writings, to ensure that only that which is the will of Asthorn is written by them. The various sects, including those named heretic, generally disagree on which of the Writings are most important. Only the Twenty-Seven are unanimously viewed as the highest order of writings.
Notably, the Prophet Zunstar and his writings are seen as extremely important in his homeland of Zunstaria, to the point of the heretic Black Dawn viewing him as equal to the Twenty-Seven. The most well known bit of his writings is that the beginning of the end of the world will be marked by a black sun rising, signalling that the last Prophet had been born. It is this passage from which the Black Dawn draw their name.