Twilight Drakonaar

The Twilight Drakonaar is one of the two creatures that can be released during the fourth wave of the Harbinger Skyriss encounter in the Arcatraz. This fight is similar to the chromatic drakonids that can be found in Nefarian's encounter in Blackwing Lair.

A member of the Twilight Dragonflight?
His name suggests that he might be a member of the Twilight Dragonflight. How is it possible is unknown, since the new Dragonflight's first members surfaced during the Wrath of the Lich King, and the prisoners within Tempest Keep were held there before the events of the Burning Crusade.