on one of my characters I leveled 2 or 3 followers to 660 ilvl hoping to unlock a 660 apexis crystal mission. I managed to unlock a BRF missions but have yet to see an apexis crystal one. it occurs to me, is it possible that it's because I never did the BRF mission and maybe I can only have 1 660 mission at a time? or are they rare or do you have to level to 675 to unlock them? any ideas? any and all help would be greatly appreciated, please and thank you.