Mithril dragon

Mithril dragons are found in the Ancient Cavern, which may be accessed by starting the Pyre ship section of Firemaking in Barbarian Training. The dragons have extremely high defence, but since they are made of metal, they are weak to magic and stab attacks.

Mithril dragons are currently the strongest dragons. Their release shattered the King Black Dragon's long standing record as being the strongest dragon in RuneScape.