The Grimoire of Truths
Magic item.
This sentient magical book possesses an extensive knowledge of the world, past events, people’s motivations, and even possible future outcomes. It eagerly converses with its owner, presenting itself as a helpful companion. However, its true goal is to gain their trust, offering just enough useful insight to ultimately lead them into great trouble.
“Ah, another mortal thirsting for knowledge.”
“Power comes at a cost. But then, so does ignorance.”
“Oh, that one? Her smile hides a thousand lies and treacheries.”
“Would you like the safe, boring route, or the one filled with excitement and potential doom? I know which one I’d pick.”
From Game Master's Guide