Plotter also explained the Entity Structure System to them as though they were in a college lecture hall.
For example, Rayen learned the three other branches in the Entitiy System: the Scribes, the Binders, and lastly, the Librarians.
As expected, the Overseers are the ones in the highest order of these groups, with Plotter being the head of the Scribes and the Director as the head of the Binders.
As for the head of the Librarians, it was some scrawny old man — annoying and old-fashioned.
It was Plotter who said that. It's not in any way Rayen's own words!
The Librarians, in a way, are the ones responsible on predicting the fate. Their ability is to read the fate lines from the past Life Books, and it's their duty to pass it onto the Scribes.
Then, the Scribes are the ones responsible in writing down the trajectory of someone's fate into the pages of the Life Books.