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Metal Dragons

TL;DR

Metal dragons are dragons whose armour are metallic. They generally have a high Defence against Melee and Ranged attacks though they are relatively weak against Magic attacks. Metal dragons drop metal bars when killed, which correspond to the type of metal dragon the player killed. For example, a steel dragon will drop steel bars, and an iron dragon would drop iron bars.

Image Type Combat Level Attacks Locations Notes
Bronze dragon Bronze dragon 131

Melee, 

Dragonfire(long-ranged)

Brimhaven Dungeon/Catacombs of Kourend Bronze dragons are the lowest-level metal dragon; however, killing them is difficult since the dragons are never by themselves.
Iron dragon Iron dragon 189

Melee, 

Dragonfire(long-ranged)

Brimhaven Dungeon//Catacombs of Kourend Iron dragons are among the most commonly killed metal dragon because they are assigned in large numbers by many Slayer masters.
Steel dragon Steel dragon 246

Melee, 

Dragonfire(long-ranged)

Brimhaven Dungeon/Catacombs of Kourend Steel dragons are found in the same locations as iron dragons, and are much the same except for their much higher Defence.
Mithril dragon Mithril dragon 304

Melee, 

Magic, 

Ranged, 

Dragonfire(extra long-ranged)

Second level of the Ancient Cavern Mithril dragons are some of the highest-level dragons of any type and are extremely dangerous. They are the only monster to drop the extremely rare Dragon full helm.
Adamant dragon Adamant dragon 338

Slash,

Range,

Mage, 

Dragonfire

Lithkren Vault Adamant dragons are a metal dragon accessible after completion of Dragon Slayer II. They are the only monster to drop the very rare Dragon metal slice.
Rune dragon Rune dragon 380

Slash,

Range,

Mage, 

Dragonfire

Lithkren Vault Rune dragons are the strongest metal dragon, accessible after completion of Dragon Slayer II. They are the only monster to drop the very rare Dragon metal lump.

http://oldschoolrunescape.wikia.com/wiki/Metal_dragons  

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