From the introduction:
New Characters, New Adventures
In The Lone Wolf Adventure Game you played as one of the Kai warrior lords of Sommerlund. With Heroes of Magnamund, your choice of hero is expanded beyond the Kai Lords themselves. You can now select from a larger range of different characters, and tailor each to your own preference. When you and your friends embark on new adventures, you will be able to play new characters who possess different skills and abilities. Instead of being part of a company of Kai Lords, you may well find yourself adventuring alongside a Durenese Knight of the White Mountain, an Ice Barbarian from the Icy Wastes of Kalte or a Dwarven Gunner of Bor.