The update fixes an issue where I forgot to remove some debug codes, which were making the initial items of the game to be overriden by debug items. And also making existing players to have unintended items available.

You can get the mod update through the download links at the main thread:
https://forums.terraria.org/index.php?threads/n-terraria-mod-rpg-races-classes-quests-and-other-things.542/

This update will make leveling more interesting, and less quick. Also implemented the possibility of other mods giving exp to the player more easily, if the player does some activity on their mod.

More infos here:
https://forums.terraria.org/index.php?threads/nexperience-mod-leveling-mod-for-terraria.83122/post-2287362

Enjoy your 55% level drop :D.

Update 5
You can now gain class exp on multiplayer.
Added "Fine Skull" item to the mod. You can acquire It from Cursed Skulls in the Dungeon.
Added "Union of Attacks", good luck finding It.
Mirror World main quest added, It will begin after you beat the game.

I don't think you guys reached the step to do the Mirror World.

Now you can play the mod on latest Terraria installation.
https://nterraria.fandom.com/f/p/3823512603066402525

This hotfix will remove the support to SubworldLibrary that the mod had. It is actually really bad not being able to play the mod, and also be forced to use something that, currently, has no use.

You can find more infos here:
https://forums.terraria.org/index.php?threads/terraguardians-terrarian-companions.81757/post-2273874

Ps:. NExperience leveling will get harder.