Well I've tried the graveyard method and all it does is spawn zombies and skeletons... so that's a bust. And as for bosses? Well 8 Eyes of cthuhlu and a Skeletron Prime and I'm BARELY at 4% on my class exp. My class being only at level 2... Starting to question to EXP rates for the normal RPG mode...
Edit: Oh and Plantera is somehow kicking my arse all of a sudden...
Edit 2: Also what does the "Code" Button do?
Beware, Class Exp isn't the same as Base Exp, even if you change the game mode, the same class leveling rate will still be under effect, since they use the monsters raw status (without level modification and stuff) to get the CP value. The class exp also is kind of messed up on Season 6, It gets harder to level up the class the more ranks you get, If you are on class Rank 4, you'll have several problems to level up the class, the best solution would be to face enemies with the highest status, which spawns on higher rates.
The way you talked about Plantera means it wasn't like that before, what changed? Is it with op status or something?
Also, the Code button allows you to place codes, as it says, in the original idea I was going to launch codes sometimes so the players could get freebies, but the idea is quite flawed due to the fact that I would need some web server to check wether the codes are alive, or who to distribute them to. But you may still make use of it, If I remember well, the Tombstones dropped from Zombies usually bring codes, just input them in the code box, I only don't remember If the codes that has spawned before you leave the world are saved in the world.
Remember guys: The best way to play is with a full party
Yup, beside I guess I should make some special changes for that occasion...