Fairy Extreme King was manic about all kinds of books and records. He even built a cave just for his books. He was exhilarated when he learned Zhang Ruochen wanted to read books as well.
"The important secret records, techniques, and saint spells are all sealed in the formation. You can read all the other books you want."
Fairy Extreme King said this, and then left, as he had some important affairs to attend to. He left Swallow in the cave with Zhang Ruochen.
Book Garden Cave was as large as the Swallow Palace Cave where Zhang Ruochen lived. It had a diameter of a hundred miles, and there were hundreds of palaces and pavilions around the cave with tens of thousands of books.
Zhang Ruochen didn't want others to know what books he read, so he asked Swallow to wait for him outside the cave.
"Ten Thousand Fields Book Room."