The Demon Book and Strange News

There are rumors in the world. There is a demon book that can record the abilities of demon beasts in the world and turn them into your own use. Having this book means you are the master of the demon clan. Now that the demon book has been revealed again, the demonic beasts have broken through the barrier and gathered in the world. All life has been devastated, and the gods have come to fight against it. Will the demon book's final destination be humans or demonic beasts?