For a blue mage to get the ability though if I remember correctly you had to have the ability done to you then you had to defeat the mob. Then at the end of the fight there was a chance that the blue mage would learn it. They could make rolls that would determine if the blue mage learned the ability or not and they could also make some abilities harder to get. Just think though, like any type of mage is going to withstand a sickle slash at level 46-50, so if they did it like that then blue mage would be awsome and it would not be as easy as everyone thinks that it would be to get all of these abilities.