I'm going to reference Final fantasy a lot.
I'm just curious what is the 5th element when combining fire, earth, water, and wind. Will we summon captain planet (perhaps we need heart) or are we going to create a FF spell such as Ultima (non elemental spell).
I second the evolution of skill and the effects are apparent as with Arhu's statement. Fire, Fira, Firaga from FF or blizard, blizara, blizaga...
Well to me the fifth element would be the Aether, but I restrained my thoughts, for if I consider we can merge more than 2 types of summons, the possibilities would be way too vasts.
Moreover, I have no idea what would result from a combination of, let's say, Water + Fire + Earth (if I stick to the 4 classical elements).
You can probably add a Water + Earth combination (Wooden or Mud Elemental), but then I have no idea what to do with Air + Fire.
An Incendiary Elemental maybe ? But it'd be close from the fire one I think.
