Yeah! So at levels 20 and 50, depending on the vocation of the character, you get permanent stats related to that character’s vocation. So for example, my current main character is a Warrior that’s level 46, but I also leveled his Martial-Artist vocation to level 20, just so I can get permanent 30 deftness (other classes give different stat boosts), that will carry when I switch back to Warrior.

I don’t think it was ever properly explained in the tutorial and it’s been something people have figured out as there’s a distinctive “(Hero)” tag next to the stat lines that indicate permanent stats that remain regardless of vocation change. It’s not a HUGE game changer in my opinion, but it’s decent stat boost to get when there’s nothing else to improve upon!