With a hammer and an anti-dragon shield in the inventory:
You set to work, trying to attach the mysterious skeletal visage to your anti-dragonbreath shield. It's not easy to work with the ancient artefact and it takes all of your skill as a master smith.
Even for an expert armourer it is not an easy task, but eventually it is ready. You have crafted the skeletal visage and anti-dragonbreath shield into a dragonfire ward.