Mind-reading in the skill column of the sect. There are six books altogether. There is a number at the back of every book, which is your mental level. To improve your mental level, you must go to your own sect. There is an NPC who teaches you to learn skills. You can see it by clicking on the small map. Go to him, use gold and experience to open the books you want to learn, and open them to increase your mind. When you rise to a suitable skill, you can drag the corresponding skill to the shortcut bar. There is a seventh book later, you can take it or buy it.