Summoner could just be part of Conjurer as originally Conjurer was said to be able to summon spirits. Part of story line also (I think cant remember much).

This is insanely good though nice work, I like it and I would also love the requiring 1 or more classes at x level to unlock something new. The only issues is you want to allow new players years from now the ability to get to to these classes. Though if they keep the lock down to like rank 20-30 which is achievable in like 2days-1week respectively I dont think it would be much of an issue.

Awesome work on the chart tho love it.