Here's all the Darkner information, Chapter 3+4 included: https://www.youtube.com/watch?v=yF2olxoj8uU

We got some new elements, but I find it interesting the "magic" element is tied to the book Darkners since it implies you need a magic stat to even read - Kris's magic stat is ALWAYS 0 outside of equipment and he refuses to read for you outside of the library upper floors and the ralsei tutorial books to my knowledge, Susie starts with a magic stat of 1 which increases little over the chapters except when you win against Gerson she gains +4 to magic: while that helps with Rude Buster it might also mean her reading comprehension has increased too. Oh, and Ralsei and Noelle have the highest magic stats, and both characters are the book smart types.

Basically could be important, could be unimportant but the implication make for a good theorycraft