A skeletal visage is an item obtained as a very rare drop from Vorkath.
Players with 90 Smithing (can be boosted) can combine an anti-dragon shield with a skeletal visage to create a dragonfire ward. Doing so grants 2,000 Smithing experience. If the player doesn't have the required Smithing level, they can take the skeletal visage to Oziach in Edgeville, who will assist in creating the shield for a payment of 1,250,000 coins. Completion of the quest Dragon Slayer is required for Oziach to make the shield.
For an exhaustive list of all known sources for this item, see here
|Vorkath||392; 732 ||1||1/5,000|