Guild Wars 2

So, I bought expancion yesterday specifically for reaper, and started training it. I got GS proficiency, I got reaper shroud, but i can’t use both, and can’t select reaper as traitline. Do I understand correctly, that I need to get to the first trait to get the ability to use anything from reaper, including shout i will get before this first trait?

The specialization traitline has to be on the third traitline in order for it work. Dont know why it has to be that but thats how it works.

I believe the reason is so when they add other specializations you won’t be able to mix them for balance issues