The Prophet is reading the Olympian Chronicles for the umpteenth time. He's prophets of the apocalypse, and he needs to stay on top of the latest prophecies.
The book is an ancient tome bound in human skin and written on pages of pure, unadulterated awesomesauce.
As he reads, he mutters to himself, "Yes, yes, yes... this is the one! This is the sign of the impending doom!"