User:Ecstasy Amphetamine/sandbox8

Description
The Eldwurms are defined by their age and knowledge rather than their physical characteristics since it seems that any species of dragon can be an Eldwurm if they fulfill the requirements of being old and wise. Hence they are a X (social caste? dragon class?) rather than a species of dragon.

Notable Eldwurms
Slyrak

Vyxia

Habitat
Ice wyverns tend to live in the northern part of the world where it is very cold, fitting for their frosty nature. Auroth's current lair is in an abandoned keep at the top of Mt. Gorod in the frigid realm of Icewrack. Another ice wyvern named Karaul Silverwing turned the waypoint between Azura and Whitecap into her nesting ground.

Morphology, physiology, and whatnot
Instead of a typical dragon's four limbs (arms and legs) and a pair of wings, wyverns have a pair of wings as their sole forelimbs and a pair of legs, very much like a bird or a bat.

According to Thesos, a dragon skeleton's bones are strong but light, and seem to be more akin to a bird's bones. This seems to suggest an interesting link between Dragons (perhaps including wyverns) and avian creatures.

Like most dragons, if not all of them, a wyvern stokes their flame breath in their gullet. This is the same organ where they store their swallowed foods, which is gnashed and grinded by the steel or other hard materials that they keep in there. In some wyverns who breathe ice instead of fire, their frosty gullets produce a cold breath that sends victims into a "burning agony"—a paradoxical combination of 2 incompatible elements. An ice wyvern's frozen gullet also has specialized vesicles that slowly produce ice shards for them to launch towards enemies as a projectile attack. As for their fiery counterparts, perhaps their gullets have flameglands (instead of ice-producing vesicles) that generates their fire breath.

It's possible that a wyvern has some of a dragon's usual characteristics, such as having remains that still retains their powers and properties, even in death: including their scales and fiery blood and volatile dragon drool. The fiery blood and explosive saliva may not apply to ice wyverns, though.

Intelligence
Wyverns have the potential to be an Eldwurm, an old and wise dragon learned in many intellectual disciplines. Thus they should be extremely wise and intelligent.

Personality

 * Like most dragons, wyverns have a tendency to hoard precious items like gold. Because of this, they are often wanted for their money.

In Dota: Dragon's Blood
Although dragons in the animated series are mostly classified by their elemental and fundamental power/identity, some dragon types resemble wyverns. Lirrak and her water dragons, including the rogue Auroth, have a wyvern's features. Uldorak and his earth dragons are vestigial wyverns, because they have shortened (hence useless) wings on their arms. The air dragons and their sovereign Aethrak are wyverns too.

Heroes
Auroth the is the most notable example of a wyvern.

Characters
Although most of the Crimson Wyvern's appearance is shown on the equipment forged from its remains, it is hard to tell if it is actually a wyvern, since we don't see the rest of its body, especially the wings which is most important in determining if it's a wyvern. Only its name tells us that it was one.

Karaul Silverwing looks like a wyvern, but the locals call it a dragon or an icewyrm,  not to mention that the lore of her stage calls it an icewyrm.

Wyvern Riders
According to the lore of the, there exists a faction of merciless wyvern riders.

Romantic interests
Aghanim loves wyverns very much and has had romantic relationships with them in the past, his first course of action upon meeting them being seduction.