The draconic visage is a very rare drop from many high-levelled dragons, as well as Skeletal Wyverns.
Players with 90 Smithing (can be boosted) can combine an anti-dragon shield with a draconic visage to create a dragonfire shield. Doing so grants 2,000 Smithing experience. If the player doesn’t have the required Smithing level, they can take the draconic 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.