Dragonkin

The Dragonkin are a race of powerful, evil, intelligent, vulture-like creatures known to have existed during the Fourth age, although it's possible they had existed on Runescape before then. The dragonkin were powerful and malevolent creatures that spread destruction wherever they went ; however, heroes such as Robert the Strong eventually drove them back to their stronghold, where they are currently plotting their return. At some point, they were enslaved for the task of guarding the Stone of Jas. They are known to have created the dragons and strong evidence suggests that they created dragon equipment as well.

The dragonkin, while not immortal, had very long lifespans, and have been known to die only in battle. However, dragonkin are unable to reproduce, and because of this are said to have become afraid of death. To protect themselves and carry on their lineage they created a race of weaker clone beings that could reproduce... those corrupted versions of the dragonkin are known today simply as Dragons.

Dragon equipment
The dragonkin are thought to be the original creators of dragon equipment.

Mr. Mordaut in a Postbag from the Hedge states, "As for dragon, I'm afraid that my knowledge of this unique metal is limited – the dragonkin never divulged the secret of how it is made..." . Fairy Aeryka near the Puro-Puro portal in Zanaris states that creatures called necrosyrtes made the dragon metal; however, it is possible that necrosyrte is just another term for dragonkin. It's also suggested that the dragonkin are connected to dragon items in some other unknown way: in Postbag from the Hedge #19, a green dragon says, "If you have trouble with us lowly dragons, you have BIG trouble with Kin. They return soon; we feel power growing, calling to us, calling to them... The very weapons that make you strong bring Kin's return ever closer." In Postbag #23, a dragon impling claims: "Dragon stuff? We found it in secret places. Many different worlds, many different places. All hidden. Deep down, in the darkness. Huge piles of things. Left for a long time, though their masters begin to stir."

The Ancient Cavern
The dragonkin are known to have created the Ancient Cavern underneath Baxtorian Falls. Movario's research strongly supports this notion: "Underground ruins of peculiar origin, reported to exist near the Baxtorian Falls. Upon researching the area, I was immediately struck by the precision of some elements within the caverns. [...] I returned and after only twelve days I found interesting, almost invisible arcane symbols - type 12, possibly of the Second Age. Also, interesting markings near to rough-looking steps, the constructions within that cavern must be of Dragonkin origin." In addition, the key required to unlock the mithril door is called the Dragonkin key. As the Ancient Cavern contains a forge used to smith a dragon platebody, this further supports the idea that the dragonkin created dragon equipment.

The dragonkins' symbol
The dragonkin are associated with a symbol with visual similarities to the Stone of Jas. It consists of a circle with a star in the right half, and on the left half, a pattern identical to the one found on the Stone of Jas.

The symbol is seen on the floor in the cutscene from While Guthix Sleeps, where three dragonkin are shown congregating.

It can also be found in the Spirit Realm, on the other side of the weak portal found in the ruins by the coast in level 47 Wilderness, where the symbol can be seen on the walls of the Spirit Realm's version of the ruins. It's unknown how the symbol came to be in the Spirit Realm, but it's possible that the symbols once existed in the real world, but were torn down and thus appeared in the Spirit Realm, similar to the Cursed magic tree's interaction with its real-world counterpart.

In the dragonkin's castle in the cutscene from A Tail of Two Cats, and in the area seen in the cutscene from While Guthix Sleeps, smaller versions of just the star part of the symbol can be seen dotting the floor.

Future activities
While Guthix Sleeps contains a teaser indicating that the dragonkin will soon become more involved in the affairs of Runescape. The cut-scene at the very end of the quest shows three dragonkin meeting in an unknown location, plotting to "bring terror and pain to the small races."

It has been speculated that Dragonkin are currently hiding beneath Castle Drakan in Morytania. An imp stated in a Postbag from the Hedge, "Regardin’ Morytania, we steer away from it. Dat place whiffs of dragon poop...which is weird-like, since there ain't been a dragon down dat way for a millemelum." . Movario's notes obtained in While Guthix Sleeps mention Morytania, the Fist of Guthix arena and the Lunar Isles as having similar energies to each other, implying that the Stone of Jas once resided in all three locations. Given that the Dragonkin were tasked with protecting it, this supports the idea of them having lived in Morytania at some time. The Oracle also states a remark strongly implying the Dragonkin, as she states, " Do not fear the Dragons... fear their Kin." This is another piece of evidence of the Dragonkin possibly influencing many pages of the history of Gielinor and even having experienced contact with the Mahjarrat kind.