In Assassin's Creed Valhalla, you can find special secrets called Treasures of Britain. This page of our guide describes where to find these treasures in the Eurvicscire region.
You will find this treasure west of the Jorvik.
The first thing you have to do is to jump into the cave. This entrance is rather visible because it is covered in ice.
Then jumps upstairs, go to the left side and get to the next part.
When you go out the open space, look to the right. There will be an ice wall, which you have to break. Now you can get to the next part of the cave.
You will find a closed room. Turn right first. You will begin the first part of the task.
Start by eliminating the roosters that will constantly attack you. Then destroy the boards that are standing by the wall so you can see the room. Your task is to shoot the vases. It will open further part of the area.
Then go to the left side. Start by killing the boar and then shoot the lock on the door, which blocks entrance.
After opening the room, everything will go smoothly. You have to go inside and pick up the treasure lying on the ground.