Well, we definitely need to add a Fireball type of spell to those in the core rules.
Both the Nature Magic and the Wizardry Schoools seem appropriate for it. As Nature Magic has the Eldritch Fire spell and Wizardry has the Elemental Bolt spell which allows the caster to throw Fire, Ice, or Electricity (deciding at the time of casting)
The thing to do is to look at the descriptions of the Schools and see what spells are already there... For example, that "Force Wave" spell -- something along those lines would likely be more of the High Magic School.
But that first spell, the one talking about the ebb and flow of magic, that isn't really suited to Novus because of the way magic is defined. That one, however, might be more appropriate to a specific setting (such as ICE's Shadow World, where magic does ebb and flow).