It takes you a little over an hour to get through the first book. The author wasn't much of a writer, and seemed to largely be writing about Erod's reign over his rise. In it the author writes a lot about the good things Erod had done such as revitalizing the military and economical foundation of Gransys, as well as forging beneficial alliances with the neighboring countries, formerly enemies and even conquerors at times. There was only brief information about his dragon slaying days at the beginning, and even that was mostly about how bad things were in Gransys already before the Duke, at the time a mere warrior, slew the dragon and earned dukedom. At the very least it mentioned how the Erod was given the divine right to be duke after slaying the dragon. After that though it just went into details about the political system of Gransys.

All in all, not much about why you're here. You've never received any form of divine direction sans the dream, assuming that wasn't simply a dream. At least there was Erod's book which might at least speak more about the dragon.