Quote Originally Posted by SuperZykra View Post
Actually ACN is not required, I only leveled my archer to 15 and got my BMG unlocked. I assume its either or in this case.
Only archer unlocks black mage. I read that it was ACN when I first started in beta 4. After I got my THM to 25, I took a break and leveled ACN to 15. When I got lvl 30 THM, the job quest was red saying I needed level 15 ARC for BLM. I'm not complaining though, at least I had Psysick early on.