This mystery can be found in the southeast of Hordafylke, near the border with Rygjafylke.
How to Complete Battle Born in Hordafylke
As you approach the area you’ll notice three children shouting about a raid. Speak with one named Kaija to begin the mystery. They will inform you that they intend to be great warriors one day, and are already calling themselves the Wolf Pack, but they need to practice their raiding. After the brief conversation, you’ll need to follow the children southwest to a mock village.
When you reach the village you’ll have to assassinate some dummies, smash some pots and boxes, and loot a minor treasure chest. All of these features can be found easily around the mock village, but you’ll find the last dummy to assassinate on top of the tallest wooden platform. Once you’ve destroyed everything, Kaija will usher you over for a word. You may not like what they have to say, but the mystery will end after the conversation regardless.