At the Hellsong Tavern, the demons don't believe Daren even when he talks about the good book. But he swears that Malik, now a keeper, pulled the book from the shelf and threw it at Daren. In flight, it opened and transformed into something resembling a bird.
It helped Daren escape the library. And all the monsters Daren encountered retreated at the sight of the flying book, its pages flapping like wings.
As they exited the old vault, the book closed and fell into the demon's hands. Daren himself heard a voice: "Take it, old friend." Even after showing him the tome, the demons don't believe Daren, because the book doesn't fly. However, the demon knows that at the right moment, it will open and lead him out of the darkest corners of the Sphere.