Happy

"Give me back the book," said Rusha. "Whatever the contents of the book, you have no right to take it because it is our secret item. You as a werewolf nation also have a secret, right? Return the book to me!"

 Now the Yaris has a very important object. With that thing, he could save Alyuura because Alyuura was in the book with Rai.

 Yaris was contemplating whether he could unpack the contents of the book as it was very hard to open. After having difficulty opening the book, Yaris became even more convinced that there must be something inside the book that should have been disassembled.

 At Lucas's palace, Yaris immediately took the book to a safe place. He along with several powerful werewolves performed a ritual to seal the book. I don't know what underlies Yaris' thinking so that he can make such a decision. Even though there is no clear clue about the book for the Yaris.