The anti-dragon shield is an item obtained from Duke Horacio in Lumbridge Castle during the Dragon Slayer quest. After the quest, the shield can be purchased from Oziach. However, although the shield may be purchased by any player from the grand exchange, one must have at least started the Dragon Slayer quest to equip the shield.
The anti-dragon shield mitigates the effects of dragonfire, reducing the maximum hit of most dragon-breath attacks by >80%. It also prevents Elvarg from severely draining the player’s combat stats. The effects of antifire potion stack with the anti-dragon shield; using both provides full protection from standard dragonfire attacks.
The shield’s defensive bonuses are roughly akin to those of an iron sq shield, though it also provides magical defence and has no attack penalties. This gives it some usefulness as an all-purpose shield.
Using a hammer and anvil, players with 90 Smithing (can be boosted) can attach a draconic visage to an anti-dragon shield to create a dragonfire shield. Doing so grants 2,000 Smithing experience. Players without the required level can bring the components to Oziach, who will assist in creating the shield for a payment of 1,250,000 coins.
After Dragon Slayer II is complete, a Skeletal visage can be fused with the anti-dragon shield in a similar fashion, creating a Dragonfire ward.
Both of these shields inherit the anti-dragon shield’s properties in addition to their own unique traits.