Twilight dragonflight

The Twilight dragonflight is a dragonflight created by the results of magical experiments carried out by Sintharia upon dragon eggs. Using ancient dragon artifacts and the powers of the nether dragons, Sintharia has created a new breed of dragons that feed vampirically on all forms of mystical energy. The first encounter of these dragons with the outside world was by Krasus, Kalec, and the draenei priestess Iridi. Iridi thought of their appearance not as shadow, but more akin to the day turning to night, like twilight as experienced on Azeroth. She thus dubbed them twilight dragons.

Night of the Dragon
The twilight dragonflight was first created by Sintharia, aka Sinestra, prime-consort of Deathwing the Destroyer. Eager to succeed where her hated mate had failed and create a new breed of dragon that would rule the world, Sintharia used a nether dragon named Zzeraku, which she captured with a Chrysalun Chamber, together with two draconic artifacts, to alter several dragon eggs from various dragonflights. The artifacts were an ancient blue dragon relic known as Balacgos's Bane, and shards of the infamous Demon Soul. Thought destroyed by the human mage Rhonin, Sintharia gathered several fragments of the Demon Soul and used the power within them to carry out her designs.

Sintharia's earliest creations proved unstable, and were destroyed by Krasus and Kalec. However, they still displayed considerable power, having the ability to vampirically drain magical energy from any source. Sintharia's subsequent creation, Dargonax, proved even more powerful and far more cunning. Dargonax proved too ambitious and strong for Sintharia to completely control, even with fragments of the Demon Soul in her possession. Only the sacrifice of the nether dragon Zzeraku enabled Dargonax to be defeated, and in his death throes he seemingly destroyed Sintharia as well.

Although Sintharia and her creations were all slain, several of her unhatched twilight dragon eggs were taken from her lair in Grim Batol by Deathwing himself. Hiding in tunnels deep beneath Grim Batol, caverns older than any the dwarves had ever constructed, Deathwing safely stored the twilight dragon eggs and began his plans to perfect the new dragonflight, intending to erase the failures of his family and use the newest breed of dragon for his own designs.

Obsidian Sanctum
Deathwing's continued absence led many to assume that Sintharia had been acting alone at Grim Batol, but a recently discovered clutch of twilight eggs inside the Chamber of the Aspects has raised fears that Deathwing himself played a role in the creation of the malefic dragons. A powerful guardian, Sartharion, watches over the eggs within the black dragonflight's volcanic chamber, the Obsidian Sanctum. If the rumors of Deathwing's involvement are true, the dark future that he set into motion seems on the verge of plunging Azeroth into a new age of twilight.

With the red dragonflight already committed heavily to battling Malygos and the Scourge, Korialstrasz sent word of the twilight eggs to the Council of Six in Dalaran in the hope that adventurers could be found to deal with the situation. As he had hoped, a band of heroes was deployed in short order, and the twilight eggs were destroyed. The incident went without fanfare, mention, or acknowledgment; and for a time, seemingly without retribution.

Ruby Sanctum
In order to shatter the Wyrmrest Accord and to crush those that would stand in the way of their master's reemergence into Azeroth, a powerful war party of the Black dragonflight, led by the fearsome twilight dragon Halion and his lieutenants Saviana Ragefire, Baltharus the Warborn and General Zarithrian, had launched an assault upon the Ruby Sanctum beneath Wyrmrest Temple.

A survivor of the initial attack, Sanctum Guardian Xerestrasza believed the true focus of their interest seemed to be the eggs kept there in the Sanctum. The heroes stopped them before they were allowed to succeed.

Cataclysm
The story of the twilight dragonflight is expanded in World of Warcraft: Cataclysm, in the region known as the Twilight Highlands, east of Grim Batol. What Deathwing has planned for them is yet to be known. They seem to be a some kind of elite guard within Twilight's Hammer clan's ranks and their drakes are seen to be used as mounts by their mortal followers.

It is explained that Twilight dragons are usually raised from stolen eggs from other dragonflights, which are then modified through dark magic. A "natural" egg found in Mount Hyjal revealed that one of their matriarchs, Desperiona, has become a viable broodmother.

It is further revealed that they are being created by Sintharia in Twilight Caverns under the Bastion of Twilight. After being slain, Sintharia says: "Deathwing, I have fallen, The brood has fallen", which might mean that her death is the end of the Twilight dragonflight.

Description
Twilight dragons resemble black dragons, but they glow with a greenish, red, or, more commonly, amethyst light. The earliest twilight dragons created by Sintharia had the ability to feed off of magical energy, particularly enemy dragons. The later dragons, those raised by Deathwing, may have similar abilities.

An adult Twilight Dragon has a row of spines rising up to 110 cm from its hips. Other dragons lack this feature. They also have 3 spikes extending from each side of their lower jaws, plus a pair of tusk like fangs from their uper jaws, each one pointing backwards and up to 2 meters. Their large horns, nearly 2.75 meters, are so connected together that they resemble a colossus blade in shape. They also have 3 spines on the forearm and thumb of their wings. They're also the same size as a regular adult dragon, just 6 meters tall, 65 meters long, 120 meters in wingspan and weighing about 9,520 kilograms - Dargonax himself was slightly larger than other dragons, being the same size as the Dragon Aspects.

Sintharia's Demise
Sintharia's final words in the Bastion of Twilight could have several different meanings. Most associate them with the fall of the twilight flight. However she is also the last remaining brood mother for the black dragonflight after the death of Obsidia. Additionally the twilight dragonflight is also capable of 'reproducing' via the eggs of other dragonflights, meaning Sintharia's death could mean little for the flight in the long run.

As a flying mount
drops from Sartharion in the 25-man version of the Obsidian Sanctum. It drops only if all three Twilight Drakes have been taken alive into the boss fight. It can only be distributed to one person per clear and has a speed increase of 280%.