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.

Strengths and Weaknesses
Mithril Dragons have an incredibly high Melee offense and defence as well as accurate Magic and Ranged attacks. Using Ranged is recommended over Melee or Magic. Mithril Dragons can only be poisoned by Smoke spells. Most players struggle to kill more than five dragons per trip with a familiar that restores hitpoints.

Chewed bones
Chewed Bones are the bones of barbarians who have fallen victim to the Mithril dragons. Chewed Bones can be burned on a pyre ship and in return the Barbarian spirit that appears will give the player an item (this is second way to obtain dragon full helm(very rare)).

Habitat(s)
The Ancient Cavern.

Weapons

 * Rune battleaxe (common, may also drop 1-5 sharks in the same kill)
 * Rune spear
 * Rune mace
 * Rune 2h sword
 * Dragon spear (uncommon)

Armour

 * Dragon full helmet (extremely rare)
 * Rune medium helmet
 * Rune full helmet
 * Dragon medium helmet (uncommon)
 * Rune Sq Shield (uncommon)

Arrows and runes

 * Rune dart (p) (14)
 * Adamant dart (p) (20) (uncommon)
 * Rune knife (8-18)
 * Rune javelin (8-12) (common)
 * Blood rune (27) (common)
 * Soul rune (10)
 * Nature rune (67)
 * Rune arrow (8)
 * Rune bolts (10-27)
 * Law rune (45) (very rare)

Charms

 * Gold charm (4)
 * Crimson charm (4)
 * Blue charm (4)
 * Green charm (4) (More common than the other 3)

Potions

 * Super attack potion
 * Super strength potion
 * Super defence potion
 * Super attack mix
 * Super strength mix
 * Super defence mix
 * Prayer mix
 * Prayer potion

Other

 * Coins (600-3000)
 * Shark (1-6)
 * Runite bar (1, 2)
 * Gems
 * Nature talisman (uncommon)
 * Silver ore (100 noted) (uncommon)
 * Herbs
 * Uncut gem
 * Ancient page
 * Chewed bones
 * Clue Scroll (Level 3) (uncommon)
 * Tooth half of a key (uncommon)
 * Loop half of a key (uncommon)
 * Dragon shield half (uncommon)
 * Draconic visage (very rare)
 * Mithril Dragon Tail-Bone (Uncommon, after Fur 'n' Seek quest for second wishlist)

Trivia

 * Mithril Dragon have a more common drop rate of the Draconic Visage than any other Dragon in the game.
 * Mithril Dragons are the only Slayer task that Duradel and Lapalok do not give advice for; "You are a battlemaster; test your skills."
 * Mithril Dragons tend to not be hunted by players except ones who have them as a slayer assignment, due to the Dragon full helm's drop in value. Players attempting to get a Draconic Visage drop will try the lower tiers of Metal dragons as they are much more cost efficient per kill.
 * In order to receive a Dragonkin Key, you must take the Strange Key Loop and Teeth (both obtained from While Guthix Sleeps) to the Mithril Dragons, and use one of the halves on the other.
 * When fusing the key together, the Mithril Dragon will temporarily appear as level 57.
 * In the postbag from the hedge, Oziach pointed out that there are bronze dragon, iron dragon, steel dragon and mithril dragon when he was chatting with Evil Dave. Oziach deduced that there will be adamant and rune dragon. But that's not the end, Evil Dave saw where Oziach was going. 'Eventually, somewhere in Runescape there must be dragon dragon,' Oziach said. Fortunately, there is no Barrows dragon or Third-age dragon.