"Greetings travellers! You must have had a harsh journey through the desert."
"We didn't see this city was on the map."
"We're just a few like-minded folks trying to keep the world out."
"How many people live here?"
"Just a few of us, and now you."
What if a mage passes his powers on to his firstborn son, and a female mage to her first daughter, leaving the parent POWERLESS? A plain mortal, a sorcerer no longer, all wizardly might gone?
Or: what if a female wizard recieves the power of a mage who sires a child with her? Could lead to promiscuous witches and overly careful mages.