this could be used as a guide, some classes are interchangeable EXCEPT CLERIC AND MOST LIKLEY WIZARD these are all very important for healing, magic shield, over time status effects, and blocking/ reflecting attacks. also, yes, the difficulty is on Classic, with most of the best gear at the time with all classes have rly high affinity level without having gems. You can do this at Chapter 10 btw. if you dont know how to get something like warrior class or any others watch SOLO DUO's vids on them he has helped a lot for me such as heart cubes, pirate, ect. Link:
https://www.youtube.com/@soloduo___/f... 