Well classes here are something unique. First time I see skills and classes giving memories of said skill rather than working out automatically as skill in game.
I like this setting though. It means that one can still train anything one want without getting limited by nebulousn"class"
why does it cost to enter the tower? tower is the central focus of the story, where every living being is sent to, so it should cost you to enter the town that is created by players and not the other way around.