Jussacks are people from the north. They originate from Zmarkan, but as the Pilanel (whom Jussacks view as evil, lying people, according to Nim) have taken over their land, they fight to get it back. They are known to be rather savage.
In The Riddle, a Jussack named Amusk was sent to capture her and take her to Arkan-da, where the Winterking resides. During their travel, Maerad forms something of an acquaintanceship with Nim, a younger man who was apart of the group. Nim aids Maerad in learning some of the Jussack language.