Twilight Dragon

From Twilight Wiki

The twilight dragonflight is a dragonflight created by the results of magical experiments carried out by Lady Sinestra upon dragon eggs. Using ancient dragon artifacts and the powers of the nether dragons, Sinestra 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.