In the second chapter, go to the ‘’Bridge over the Gudrin river’’ map area. You will see an old collapsed man there, who asks you to get him some berries. Agree to help him and go south, across the bridge, and then turn west along the river. You should find a bush that you can interact with. It is located close to the western edge of the location.
Loot the berries, come back to the old man and talk to him. Give him the Black berries or kill him for defaming you. If you decide to give him the berries, you will receive 600 XP.