As someone who loves reading novels, I don't have any reliable sources to confirm if the Dragon Clan's prequel, Mourning Wings, has a physical book. However, according to the common form of publication, novels were generally divided into e-books and physical books, depending on the copyright status of the novel and the choice of the bookstore. You can search for relevant information in your local bookstore or online bookstore to confirm whether the novel has been published in physical form.