Most expensive master book? I just finished some quests in Golden Temple and recevied a mastery book that will raise a desired skill to 20. I'm level 116 and all I have is 600k right now.. So I'm wondering which skill I should use this on in your opinion? I'm thinking I could use it on one of the skills that are very expensive to buy, and then save money for the cheaper skills. But which one would that be? I'm playing on Kradia, EMS. Thanks.