This page of the Assassin's Creed Valhalla guide has a detailed walkthrough of The Wound-Wands of Friends side quest.
Rewards for completing the quest:
- 1,200 XP;
- Broken Axe from the Head of a Warrior.
In the place marked in the picture above, you will meet a man (Axehead) who complains about a headache. No wonder – he has an axe stuck in his forehead.
During the conversation, you will be able to tell him the truth about what really happened to him and that he will go to Valhalla or lie to him a bit.
When the conversation is over, the man will talk for a little bit more. Pull the axe out of the Viking's head and the task will be completed. The man will unfortunately die.