I tried grinding the weapon xp of the Staff in order to get it to a higher level, but it didn't actually get any xp even after 6 battles using it? Could it be because I used the Weapon Xp item to get it to level 2 or because it is a Slime Staff? Or is there something else?
Also, the Spellbook Fireballs skill doesnt actually set enemies on fire, it just says it does
After playing some more and moving on from the Kuro area, and fighting some slimes, I started getting xp again, so it is something specific to the Kuro area, I think?