mastery level wont unlock
Masteries are one thing, such as Gliding, or Mushroom Jumping.
Profession Specializations are something different, and use Hero Points.
You can read more about them here: http://wiki.guildwars2.com/wiki/Specialization
You must be L80 and have completely unlocked all core Traits and Skills. Once you have done this, you can start spending additional Hero Points on your Elite Specialization once you have equipped it in the third Specialization slot.
Good luck.
Masteries are one thing, such as Gliding, or Mushroom Jumping.
Profession Specializations are something different, and use Hero Points.
You can read more about them here: http://wiki.guildwars2.com/wiki/Specialization
You must be L80 and have completely unlocked all core Traits and Skills. Once you have done this, you can start spending additional Hero Points on your Elite Specialization once you have equipped it in the third Specialization slot.
Good luck.
As you can see by the screen shot this character is a lvl 80 and all the core traits are unlocked. This is the only character that I have had a problem with.
Sigh…. this question every week.
Fix: equip druid trait line in the Build window. You can equip this traitline only in the last slot, which is in fact for future elite specializations too.