OK so I'm new to the game but I love it.  I received 2 extra spellbooks and I am wondering what is the best way to have all 4 mages with complete playable spellbooks at the same time.   Should I invest in another core set or get a couple of the core spell tomes.  I don't need multiples of every spell in the game,  but would like to be able to just grab a spellbook and be ready to play.   Thanks guys.