Adamant dragons are metal dragons first encountered during Dragon Slayer II, in which the player must fight against one during Zorgoth's assault. After completion of the quest, they can be found in the western chamber of the Lithkren Vault.
To get back to the laboratory underneath Lithkren, players can travel using the rowboat from the quest or, after completion, taking a digsite pendant and using it on the strange machine north of the rune dragon room, adding a teleport straight to Lithkren on it.
Adamant dragons are the result of a side project of Zorgoth's after being inspired by another dragonkin, Forcae, which involves infusing dragon eggs with various metals. While Forcae's metal dragons were created to find a solution to the dragonkin's infertility, Zorgoth had bred his metal dragons for his war against humanity.
Adamant dragons have multiple attacks, similar to mithril and rune dragons. Along with standard dragonfire attacks, they have a standard melee, ranged and magic attack (which resembles Earth Wave), as well as two unique attacks.
The first attack is a poison projectile, which lands on the player's position and splits into two more projectiles around the original projectile in a 5x5 area. These projectiles can hit from 14-25, but can be reduced to 4-8 by being under the effect of any poison protection. Players can avoid the attack entirely by moving three squares away from their original position when the attack was launched.
The second attack is a Ranged attack that hits through Protect from Missiles, and uses the Blood Forfeit effect from enchanted ruby bolts, where the dragon sacrifices 10% of its current hitpoints to deal damage equal to 20% of the player's current hitpoints. Because of this effect, it is recommended to keep the player's hitpoints around 40-50 to minimise the damage dealt from this attack.
Item Quantity Rarity GE market price Adamant platebody 1 Common 9,609 Rune mace 1 Common 8,346 Rune scimitar 1 Uncommon 15,119 Dragon platelegs 1 Rare 161,452 Dragon plateskirt 1 Rare 161,441 Dragon med helm 1 Rare 59,286
Item Quantity Rarity GE market price Adamant arrow 30–39 Common 1,740–2,262 Chaos rune 62–130 Common 6,200–13,000 Death rune 23–90 Common 5,129–20,070 Wrath rune 10–30 Uncommon 3,960–11,880
Item Quantity Rarity GE market price Grimy avantoe 1 (noted) Uncommon 1,524 Grimy snapdragon 1 (noted) Uncommon 8,457 Grimy torstol 1 (noted) Uncommon 8,072 Grimy ranarr weed 1 (noted) Uncommon 7,580
Item Quantity Rarity GE market price Adamant bolts(unf) 22–40 Common 4,598–8,360 Adamant javelin heads 42–50 Common 7,308–8,700 Adamantite ore 2–30 (noted) Common 2,476–37,140 Diamond 1–3 (noted) Common 1,973–5,919 Adamantite bar 5–34 (noted) Uncommon 10,480–71,264 Runite bar 1 Uncommon 12,405 Dragon javelin heads 20–24 Uncommon  19,560–23,472 Dragon bolts (unf) 15–40 Rare 21,810–58,160
Item Quantity Rarity GE market price Wrath talisman 1 Rare 803 Clue scroll (elite) 1 Rare (1/320) Not sold Dragon limbs 1 Very rare (1/1,000) 6,398,986 Dragon metal slice 1 Very rare (1/5,000) 2,128,285 Draconic visage 1 Very rare (1/9,000) 7,844,716
- Upon release, adamant dragons used the Armour Piercing effect from enchanted diamond bolts, which would be halved if the player activated Protect from Missiles. This was changed to the current attack in an update on 8 January.
- In addition, adamant dragons had a 1/5 chance of their dragon bones drop being replaced by superior dragon bones. This was removed from their drop table in an update on 25 January 2018 as part of a balancing change.
- When the special attack was changed from the diamond bolts effect to the ruby bolts effect on 8 January, the slayer tip given by slayer masters was not changed until an update on 26 July. Previously, the tip was "Adamant dragons can fire metal bolts right through your armour as though it weren't there. Watch out for their poison bombs too."