Netherwing Drakes

The netherwing drakes can be obtained only through exalted reputation with Netherwing. There are daily quests available for this in Shadowmoon Valley (Outland). The rep grind could take quite some time, but there is a way to speed it up. There are netherwing eggs located all around the area in which the daily quests are, gathermate2 is a great addon to have in order to know the location of these. There are about 6 different colour netherwing drakes and the purple one goes towards the achievement [Awake the Drakes].