Just watched the new X-Men movie for the first time. In it they showed a mutant who could create dimensional portals, which is certainly a very mage like ability if transferred into D&D or Elder Scrolls, wouldn't you say? Well, it got me thinking, what school of magic would such an ability belong to? I've pinned it down to either Alteration (because of the manipulation of the natural environment) or Conjuration (because you're creating a portal like you would a creature or object). My guess is that it's leaning more on the Alteration side of things.