why is it when you fight someone and they have a certain class above there head they still cast spells from another type class or use spells from another classes and change it to there type class. if an enemy like a ice guy can use a fire spell which is used as an ice spell we should have the right to get that spell in our class whether its ice, fire, etc. fighting enemy is fine but if it says there ice then all they should bealbe to use is ice spells of the same type spells the class of ice gets to learn.
if you are refering to mutate spells then i can answer for you mutate spells are from the new astral schools i believe it was the sun school as well as it ( used to be) from the archivist)