Undead Dragon

Undead Dragons are the remains of fallen dragons that have been risen or withered through necromancy or some other magical means and who during their mortal lives, could be traced back to one of the ancient dragonflights. They can appear in many forms including appearing as reanimatied bones, zombies or spectral. The majority of these undead dragons are controlled by the Scourge, however there are several who are independent or serve equally powerful masters.

Types

 * Emberwyrms - These dragons are created by reanimating the bodies of fallen wyrms of the Red Dragonflight.
 * Fel Dragons - These withered corpses are created through exposure to Fel energies and can be created from the corpse of any dragon regardless of dragonflight.
 * Frost Wyrms - These dragons are created by reanimating the bodies of fallen wyrms of the Blue Dragonflight.
 * Magmawyrms - Similar in appearance to the Emberwyrms, these dragons are the reanimated remains of wyrms of the Black Dragonflight.

Notable Undead Dragons

 * Sapphrion - An ancient Blue Dragon that guarded many magical artifacts within it's lair nestled within the icy continent of Northrend, he was slain by Arthas Menethil while the fallen prince attempted to reach the Icecrown Glacier to defend the Lich King.
 * Nightbane - Formerly a blue dragon by the name of Arcanagos, he confronted the mage Medivh and attempted to dissuade him from his current descent into madness. Finally attempting to use force, he was afflicted by powerful magic by Medivh and burned alive from the inside out. His remains litter the mountains around Karazhan.
 * Nefarian - An insidious black dragon who took the guise of Lord Victor Nefarius, he was slain within his bastion of Blackwing Lair by a group of brave adventurers. Many years later when his father Deathwing returned to Azeroth on the onset of the Cataclysm, he reanimated his fallen son and charged him with continuing his experiments within Blackrock Mountain.