After asking a few more questions, Zhang Xuan finally closed the book.
The fellow was indeed unaware of the matters surrounding Kong shi's Innate Fetal Poison, so it was impossible for Zhang Xuan to get anything out of him.
Being poisoned was a sign of weakness. One would hide it even from one's allies, not to mention one's enemies.
This was similar to how Zhang Xuan had never told anyone that he was poisoned. Most likely, Kong shi back then was the same as well.
But in any case, through the questioning session, Zhang Xuan did manage to understand the true reason for that fellow being reduced to a mere heart, and the real purpose behind this underground chamber.
The previous host of the heart did wield destructive power, and he did dominate the world at one time. Countless humans had died by his hand.