The Mysterious Berserker Assassin's Creed Valhalla Quest
Group: The Way of the Berserker
The quest begins after reading Norvid's note from the letter box inside your room in Ravensthorpe. In order to receive this letter you will have to reach England, build your settlement and push the game's storyline forward a bit. This quest is available for free to players who have pre-ordered the game.
A mysterious Berserker has appeared in East Anglia. Eivor decides to seek him out and find out if the legends about Berserkers are true.
Norvid's Note
Eivor,
The gods favor us! In a cave near Northwic, I glimpsed a legend--Bjorn the Berserker. A great white bear walks at his side, while Mercian soldiers dog his steps.
-Norvid the Scout
Quest stages of The Mysterious Berserker
1. Find and speak to Bjorn
Head to the place in East Anglia marked on your map and look for Bjorn's cave.
Bjorn will tell you about his desire for vengeance against the Mercian lord who caused his wife's death. To gain his trust you will first have to feed his bear.
2. Speak with Njal / Follow Njal the Bear
Speak to Njal...
...and then follow the bear to a nearby river.
3. Get Bullhead trout for Njal / Feed Bullhead to Njal
Fish for Bullhead trout and feed it to Njal. If you do not have your fishing line yet then you can use your bow and arrows. If you already have such a fish, you will just have to give it to the bear.
4. Kill the Mercian soldiers
Once you feed the bear, a few soldiers will appear in the area and attack you. Kill them all.
5. Return to Bjorn / Kill the Mercian soldiers
Return to Bjorn's cave and help him get rid of the soldiers who attacked him.
6. Speak with Bjorn
When you get rid of the attackers, talk to Bjorn again. He will tell you what he needs to get vengeance on his wife's murderer. This quest will end and you will receive a new one - "The Ritual of the Berserker".
After completing The Mysterious Berserker you will get or will be able to get The Ritual of the Berserker.