You have to start a new world and delete all old configs of this mod. It's highly recommended.
-Improved the code in general
-Better ability GUI
-Experience and the ability system has been changed: Now you will need experience to unlock abilities, and tokens to upgrade them.
-Tweaked bonus experience amount on killing a mob
-Now you will gain experience by respect to the damage you dealt
-Experience algorithm has been changed: Now there is only 1 config to tweak the experience hardness. It's there, 40 by default.
-Fix blacklist system doesn't work actually
-Fix armor rarities don't work with some damage sources
-New config; Whitelist: Now you can whitelist items. Leave the whitelist empty to disable the whitelist.