Really enjoyed the game, but I felt the class advancement was ether to easy, or not engaging enough. It was chose your class, teleport to npc, do one quest and boom, new class.
I think maybe if we made the class advancement more engaging is taking out the teleport feature for that quest. instead we need to remember the npc (since most times class npcs had their master title underneath) that way it encourages more exploration and talking to side npcs. instead of being able to instantly teleport next to them.
For the quest, it just felt so, weak. we were not engaging in becoming this new class, like what are the goals for the class like the goal to defeat the undead like a cleric type class, or protect the innocence (a paladin class), etc… and more story content to make them feel more unique rather then a simply power up. class advancement is a perfect chance for more world building.
Also for maybe unique hidden class only become available depending on the characters achievments and stats. like a certain amount of monster type kills. or the amount of criticals you’ve done throughout the games, to what skill you use the most, or the unique distribution of stats. allowing for classes to open up more uniquely.
Sorry for the long post but just wanted to shout out a idea.