Mysterious chronicle (part 1) is a book found only in Daemonheim. It may appear in front of the dungeon-ending ladder after killing the boss monster. It is also the first book of a series.
He mentions whispers, which are frequently referred to in later entries.
Year 1225 of the 4th Age:
Finally! After four long years of bringing in weak-minded fools to follow my cause unknowingly, today is the day - the day I begin the great descent. Today, my research pays off and the journey begins; today, I journey down towards ultimate victory.
My power is as true as the whispers calling.
Today, I begin.Praise be to Zamorak!