Rune dragons are found in the remains of Mount Firewake, where the Kethsians kept the Stone of Jas, until it was overused and awakened the Dragonkin. Also located in this area is the laboratory of the DactylForcae, a disciple of Kerapac that created the adamant and rune dragons.
With the Patch Notes on 22 June2015, rune dragons received a number of changes, including increased combat and slayer experience, a greater number of spawns, non-aggressiveness, and reduced damage from enhanced dragonfire.
Rune dragons have a total of three phases that must be completed with each kill, with the first phase requiring the use of dragonbane bolts or arrows in order to break through their metallic armour and with the second being unreachable with melee weapons.
In addition to magic and melee attacks, rune dragons use a very powerful dragonfire attack during their second phase that cannot be completely blocked even by a Dragonfire shield or Super antifire potions; however, full protection will reduce the damage to around 450. Their ranged attack will freeze the player for one second.
The dragon will begin flying, during which time it is immune to melee attacks. Dragonbane is no longer required to deal full damage. If the dragon was damaged below this life point threshold, it will heal back to 45,045. In addition, it will stop using melee attacks and replace its standard dragonfire attack with the enhanced version.
Throughout this phase, the rune dragon may breathe a bright blue plume of enhanced dragonfire onto your character, dealing magic damage. This attack will still deal a portion of its full damage even if the player is protected by a super anti-fire or wyrmfire potion (a minimum of 425 magic damage). However, if the player is far enough from the dragon, a small cloud appears under the player indicating the enhanced dragonfire is being used and can be avoided by moving away from it.
Upon release, there was a bug that caused Rune Dragons to build up their rage outside of combat, due to players leaving combat during the 3rd phase. This caused them to easily kill players in a single hit. This bug was patched the following day.
There is currently a glitch where damage from a dwarf multicannon will deal full damage for phase one of the fight, even though dragonbane ammo is required in order to harm them.
This article incorporates text from the RuneScape Wiki which is also licensed under CC-BY-SA.