Each winter in Imardin, the capital city of Kyralia, the streets are purged of the "dwells", the city's poor under-class, by magicians who drive away the inhabitants of the city's slums. Although young gang members gather to throw rocks at them, the magicians are protected by a magical shield—until Sonea, a young dwell, hurls a rock through their barrier and injures the magician Lord Fergun.