Mithril dragons can be found and fought in the Ancient Cavern. To access the Ancient Cavern, the player needs to start the pyre ship section of Firemaking in Barbarian Training. Be wary as these monsters are extremely powerful. Their release broke the King Black Dragon's long-standing record as being the strongest dragon in RuneScape. It is strongly recommended to use antifire potions in conjunction with an anti-dragon shield (or a Dragonfire shield) when fighting these along with the appropriate protection prayer.
The ability to be assigned mithril dragons can be purchased for 80 Slayer reward points. Once unlocked, they can be disabled, but players must spend another 80 points to unlock them again. Players also must have entered the Ancient Cavern at least once to get mithril dragons as a slayer task. 
Slayer Masters offer to convince mithril dragons to drop their bars in noted form while on a slayer assignment, for a cost of 200 slayer points.
Mithril dragons can be found on the top level of the Ancient Cavern. Note that dwarf multicannons are not allowed in the Ancient Cavern.
To access the Ancient Cavern, one must have completed the first part of Barbarian Firemaking training and then talked to Otto about pyre ships. After the conversation is over, the player can now go in the whirlpool. Upon entering, one must climb down stairs and then run south to a set of stairs leading up to the mithril dragons.
- ↑ https://twitter.com/jagexash/status/713721069136449537
- ↑ Dropped in bank notes if players have purchased the Duly noted unlock for 200 slayer reward points and are on an active slayer task of mithril dragons
Item Quantity Rarity GE market price Rune battleaxe 1 Common 24,589 Rune dart(p) 14 Common 16,198 Rune mace 1 Common 8,308 Rune full helm 1 Uncommon 20,709 Rune knife 8–18 Uncommon 2,344–5,274 Rune spear 1 Uncommon 12,103 Dragon full helm 1 Very rare (1/32,768) 38,691,382
Item Quantity Rarity GE market price Blood rune 27 Common 7,803 Rune javelin 8 Common 1,304 Dragon javelin heads 15 Uncommon  14,520 Rune arrow 8 Uncommon 760 Runite bolts 10–21 Uncommon 3,490–7,329 Soul rune 10 Uncommon 1,470
Item Quantity Rarity GE market price Prayer mix(2) 1 Uncommon 4,666 Superattack mix(2) 1 Uncommon 645 Super def. mix(2) 1 Uncommon 735 Super str. mix(2) 1 Uncommon 1,111
Item Quantity Rarity GE market price Coins 600–876 Common Not sold Runite limbs 1 Common 9,340 Runite bar 2 Common 24,922 Shark 1; 6 Common 739–4,434 Chewed bones 1 Uncommon (1/42) Not sold Ancient page 1 Uncommon (1/64) Not sold Clue scroll (elite) 1 Rare (1/350) Not sold Draconic visage 1 Very rare (1/10,000) 6,913,084
Rare drop tableIn addition to the drops above, this monster has access to the standard rare drop table.
Show/hide rare drop table Item Quantity Rarity GE market price Coins 3,000 Rare Not sold Loop half of key 1 Rare 11,930 Tooth half of key 1 Rare 9,633 Uncut sapphire 1 Rare 631 Runite bar 1 Rare 12,461 Unknown talisman
1 Very rare Error Nature rune 67 Very rare 13,735 Rune 2h sword 1 Very rare 37,975 Rune battleaxe 1 Very rare 24,589 Uncut emerald 1 Very rare 775 Law rune 45 Very rare 9,045 Death rune 45 Very rare 10,035 Steel arrow 150 Very rare 4,500 Rune arrow 42 Very rare 3,990 Adamant javelin 20 Very rare 1,200 Rune sq shield 1 Very rare 22,663 Dragonstone 1 Very rare 12,040 Silver ore 100 (noted) Very rare 7,500 Uncut ruby 1 Very rare 1,419 Rune kiteshield 1 Very rare 32,220 Dragon med helm 1 Very rare 59,301 Rune spear 1 Very rare 12,103 Shield left half 1 Very rare 65,700 Dragon spear 1 Very rare 37,888 Uncut diamond 1 Very rare 2,863 Rune javelin 5 Very rare 815
- Prior to the release of Dragon Slayer II, mithril dragons were brighter in colour. Their old appearance was given to rune dragons to make them appear more like the metals' true colours.
Dragons and dragon-like races
• • • • •
• • • • •
Lava • •