Ever noticed that each pantheon seems to have a domain over different types of magic? Aman'thul is time, Norgannon is Arcane, Eoanar is nature, etc etc..
If so does a new titan like Argus or Azeroth introduce a new type of magic into the universe or becomes the patron of a new type? I know they wield all types, each of them, but they do have one type as a signature.