On this page of the Assassin's Creed Valhalla guide, you will find a detailed description of the Adorning the Adorned mission walkthrough.
With the funeral gift in hand, Eivor is looking for an exiled craftsman who will decorate this last gift for Jarl Hemming.
Reward: 3400 XP.
Speak with Vili
Go to the watchtower in Hemthorpe to talk to Vili. The Raven's Clan prepared a special gift for Hemming - a wonderful shield. Eivor wants to additionally decorate the gift and carve a fitting sign on it, which will commemorate the wonderful friend and jarl.
Find the entrance of Peak Cavern
The entrance to the cave is located east of Hemthorpe. Go inside and look for the exile Vili spoke about.
You will find the man called Hermit at the very end of an underground complex. When you talk to him and ask him for help, the exile will have you stacking stones.
It's a very simple task, to complete which you need only 3 stones, so it will not cause you any problems.
When the task is completed, speak to the exile again and he'll agree to help. You can now choose which shape will be engraved on the shield that will be given to the deceased Jarl. It's pure flavor so your choice won't have any plot meaning - you can choose the symbol as you wish.
After a short cinematic break, the mission will end and you will receive 3 400 XP as a reward.