4th Job Skill Book Choice. Mastery,Blade Burst,Barrage? Which do I choose? Kaiser is so OP that mastery can wait for now and sit at lvl 10, but if mastery is the best bet then i guess Ill go with it, I watched a video and Blade Burst at lvl 1 looks OP as OP can get, so I was thinking maybe getting blade burst. Thoughts?