Dragonfire

Dragonfire is, as the name suggests, the fiery breath used by dragons against their enemies. All adult dragons are able to use it, with the exception of the Revenant dragon.

Abilities
Dragonfire is much more powerful than regular fire or the fire from fire spells. A dragon can deal up to 6000 damage to players without proper equipment. Dragonfire is unique in the fact that it defies the combat triangle. It is a different form of attack in itself, however, it can still be partially resisted by using the Protect from Magic prayer or the Deflect Magic curse. This is only a small part, however, and even then it can hit up to 400+ damage. Familiars are not affected by dragonfire.

Depending on what the game message says, and if you used anything, damage will be calculated as this:
 * "You manage to resist some of the dragonfire." - Approximately 150-300 damage will be dealt.
 * "You are horribly burned by the dragonfire!" - More than 300 damage dealt, unless an antifire potion is used.
 * "Your prayers resist some of the dragonfire." - Damage ranging from 0-150.

All dragons, including chromatic dragons and metal dragons, are able to use ranged dragonbreath and will use the attack when both close or far away from the target. The King and Queen Black Dragon are even able to use multiple types of dragonfire. The king's dragonfires may include the added effects of freezing, poisoning and stat-reduction. Baby and pet dragons are not able to use dragonfire.

The skeletal wyverns don't use dragonfire, instead, they use an ice-type breath which is even more dangerous. It can reduce the stats of a player and prevent them from moving. This breath can only be negated with the use of an elemental shield or dragonfire shield.

Protection
There are several methods to protect oneself against dragonfire.

Using dragonfire
Players can also use dragonfire in combat, but only under one condition. The dragonfire used by players has the same effect as dragonfire used by dragons. Therefore, it can hit very high against players without proper protection.

The only way to use dragonfire is by using enchanted dragon bolts in ranged. These bolts have, like other enchanted bolts, a special attack. This special attack enables the wearer to occasionally hit the opponent with a blast of Dragonfire, dealing 400 to 710 damage. The amount of damage dealt is based on the opponent's Defence level.

Just like regular dragonfire, this methods will not cause damage if the opponent is a fire monster or a dragon. In PvP situations, if the opponent is wearing an Anti-dragon shield or under the effects of Antifire potions (or both) the damage is reduced significantly.

Magical fire is not considered as dragonfire. The protection needed for dragonfire doesn't provide protection against fire spells.

After While Guthix Sleeps, players need dragonfire to combine the two parts of the dragonkin key. This can be done by using both parts of the key on a mithril dragon.

Trivia
Dragonfire
 * The message when you are partially protected from dragonfire is different depending on what kind of protection you have. For example: If you are using an anti-fire shield, it will say "the shield protects you from the heat". If you are using just an antifire potion, it will say "the anti-fire potion protects you from the fiery substance". This implies that dragonfire is made up of several different factors, such as heat, substance and even magic.
 * Prior to EoC, players could use a Dragonfire Shield to hit a player with Dragon breath, just like an enchanted dragon bolt.  The Dragonfire shield stores 50 charges, thus allowing the player up to 50 uses of Dragonfire, but with a cooldown time between each use.  Also, each use would reduce the defense of the Dragonfire shield by 1.