Hiro felt tense, nervous, and excited at the same time. He listened attentively to what Noah had just read. For people who were not so lucky in his real life, Hiro felt very lucky in the Last Shelter Online.
The book that he got almost for free was very important because it had a big secret. He was sure he could increase his demon's body rapidly if he followed what was said in the book.
The book explained the secret of the 7 high priests who had stripped Lucifer of his armor before ending up sacrificing themselves to seal the demon in the Underworld from hundreds of years ago. And what was written in it was complete. It even wrote about the location where they spread Lucifer's armor in the world.
Even the name of Lucifer's armor set was clearly stated.