I'm in chapter 5(Yuela Route) and after completing Giant's Mine and Monster Nest I earn xp very slowly when killing enemies, about 10 per kill but before it was about 50 per kill. My highest characters are lvl 24 and I want to level them up at least one level before going to Misanshel. Is there any place where you get decent xp or should I go to Mishanshel right away?

u can use deadbeat to lvl ..... also u can do the map np have lots of dark weapon and light armor ..... i did the map with lvl 25 character (average lvl) and suffer zero lose)

There is no light armor available before that map but thanks anyway. I managed to level a bit in the arena.

u will notice that some character will not need to lvl or train cuz they r not that good .... in the end when u get to ng+, u will be using ng character and main characters the most ....