As with Barathor's skull, we should, if his family will allow us, keep a relic or two of Surt. We should have one we use in the Oathing ceremony for whomever will take his place, and for new Royal Army Rankers. Also, we should have something of his we take to battle and carry with us to represent his spirit fighting with us whereever we go. A sword, or garb or something we can display with the banner at all times.
Konradr