Which Jett mastery book should I pick? So I've reached level 70 on my Jett and have the option to choose from the following special mastery books: -Rapid Fire 30 -Starfall 30 -Brain Scrambler 30 -Eight-Legs Easton 30 Which of these skills should I choose? I want the book that would be most useful to me/ the skill I max the soonest.