Any escort mission where the person you have to escort is completely helpless (aka worthless).
Also, as for a specific part, starring every Arena rank in Resonance of Fate. Oh God. @_@ So, that's 45 levels that you have to do 10 times. I'm sorry, but that was pure hell.
Also, as for a specific part, starring every Arena rank in Resonance of Fate. Oh God. @_@ So, that's 45 levels that you have to do 10 times. I'm sorry, but that was pure hell.