Your character on the left side of my screen says youre a level 56 dragoon. Lets say that tomorrow you went and unlocked samurai. Samurai starts at level 50. So you would have access to: the leveling roulette(with all the 15-50 leveling dungeons), the trials roulette(level 49 & 50 duties), the 50-60-70 roulette(with any optional level 50 dungeons you unlocked), the MSQ roulette(castrum or prae), the alliance roulette(as you as you unlocked 2+ of the crystal tower series), the pvp roulette, and the guildhests roulette. If a week from now you were level 60 and unlocked Dancer(which starts at 60), you would immediately have access to all those roulettes, and some of them would have extra content from 51-60. On the other hand, if you unlocked Dark Knight(starts at 30) you would only have leveling(15-30 dungeons), pvp, and guildhests available to you until you leveled up farther.