Act 3 Chapter 21: What ahve we learned?

[Thaumaturgy22]

Okay so it tells me to defeat the Paper Dokkabei located throughout the pilfered treasury, I've killed every last one, go to the quest marker, and nothing :/ What am I supposed to do here?

[kkind002]

Kill them then and pick up their books that drop afterward if I'm thinking of the right part.