Dragonfire

Dragonfire is the fiery breath attack used by dragons, hence the name. It can deal considerable damage to players without an antifire potion in conjunction with an anti-dragon shield or dragonfire shield, often hitting into the 50s.

Abilities
An adult dragon can deal up to 60 damage to players without the proper equipment. Regular armour doesn't offer any additional protection from the flames. However, there is a chance that one will "resist some of the dragonfire". As such, the amount of damage negated is usually small, however, and even then it can hit up to 40+ damage.

Normal chromatic dragons (green, blue, red, and black) only use close ranged dragonfire attacks, meaning that the dragons will only use it if the player is in melee distance from the dragon. Stronger dragons, like the King Black Dragon, brutal green dragons, Elvarg  and metal dragons, have long-ranged dragonfire, and use it in both close or long-ranged combat situations. The King Black Dragon is even able to use different kinds of dragonfire, each with a different effect, including freezing, poisoning and stat-reducing. Baby dragons cannot 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.