I believe that I found a bug. I have upgraded Myrth's Dispel/Neutralize to level 5, but in battle it only removes three turns of debuffs instead of five, and it also reads as if it's Neutralize 3 instead of 5. That can, on occasion, be rather irritating, as there are some debuffs that do need five turn removal, and while Lydia's Miraculous Potion skill can remove those easily, Lydia doesn't have the SP increase passive like Myrth, so Myrth can cast those more easily than Lydia.