Two sisters.

Yes, the whole point of the map is that the task is to conquer, not to destroy Grimheim (I don't remember if I wrote about it in the tasks, but it's okay).

If the task is to conquer, then you need to give the opportunity to recruit heroes from the Goths who have realized the beauty of life under the rule of the warrior sisters. After all, you can't conquer a country without relying on renegades from the natives. For example, you defeat a partisan and have the opportunity to lure him to your side with an artifact or natural resources. Then you will think about what is better - a scarecrow Karl or a hundred priests of Arkat, recruited in his castle.