The light prognosticus is a book telling you what you are capable of doing, as opposed to the dark prognosticus, which tells you what you are going to do and what will happen to you. the light prognostic us is currently owned by Nerrbot who stole it from Merlon. contents: the books introduction deals with general advice. The preface reads: "**** happens." in the first chapter, a love story is narrated, followed by the preface repeated. This might be a misprint. a quick synopsis of the love story follows. boy meets girl, everyone dies.