Random event:
Mage <x> (who must have been idle last turn) was dabbling in the lab and learned <+1 to some magic path, including those he didn't have before>.
A group of <x's, a magical commander type> moved into <province> and are now recruitable. (The province must already contain the building(s) needed to recruit them.)
A freak magical mishap caused an enchantment <a global that affects everyone equally> to come into being. It is treated as if cast by someone just able to cast it and with no extra gems.