So I can take the shard of anaris for example on fuegan replacing his fire axe and he then attacks at strength 6 with instant death if making a challenge?
Only units WITH THE ENTRY that says you can take Remnants of Glory are allowed to do so. Just look at the entry. All of the named characters do not have access to the list. It must say they can take items from the Remnants of Glory. Why would you think Fuegan can?