An Anti dragon breath Shield is a shield that provides protection against fire breath from dragons. A player first learns about the anti dragon breath shield in the Dragon Slayer quest where the Duke of Lumbridge gives the player the shield in order to fight Elvarg the dragon. This shield lowers the damage taken by dragon fire attacks from all types of dragons. This is practically a necessity if fighting dragons. Without wielding the shield, players will be burnt by the dragon's fire breath and will be inflicted very high damage. However, you may replace the shield with your shield of choice after you've gone into combat with the dragon.