The Chamber of Faces is a tome found in Act II of Diablo III. It is found next to the entrance of the Tomb of Khan Dakab in the Dahlgur Oasis.
It reads as follows:
The vault door is sealed by magic means. The stone faces upon the ground seem to have some reaction to our presence. We would investigate further, but our intrusion has woken something in these halls. We should not linger. -- Iron Wolf Jarulf