what would a guideline be to change an elemental type spell into another element?
Like pilam of fire into torrent of water/pilam of ice / javelin of earth.
various uses would be to change a damage type because what your fighting could apear to be immune.
change an incoming spell into an elemental type that you have an immunity / ward against / or a mastered spell resistance against.
I would definitely think there would need to be separate spells for each elemental form.