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 Snotinghamscire region.
You will find this treasure at the northern end of the map.
The first thing you have to do is to jump into the cave. This entrance is very visible because it lights up in blue.
When you get to the next part of the cave, you will find a key. Use it to open the door to proceed.
Your next task may be slightly problematic. You have to climb rocks, statues, stalactites, and stalagmites to get to the next part of the cave. If you fall, you will have to repeat the whole process from the beginning.
You will reach the room with the treasure. It is right under the statue so it is easy to spot.