Did the 3 mastery quests, and each time I received an identical tome titled Book of Masteries. There is no context menu. So I am a bit confused. How do I swap Masteries ? Do I have to be a certain skill level ? Music is 100.x and the 3 other skills are 90.x OK - After using the Disco song masteries on myself twice, the book now has a context menu for switching, and energy type.