Our good old Emerald Dragon (http://www.wowhead.com/npc=102679/ysondre, http://www.wowhead.com/npc=102683/emeriss, http://www.wowhead.com/npc=102682/lethon, http://www.wowhead.com/npc=102681/taerar) also got corrupted by the Nightmare and we had to "cleanse" them.
(https://www.infinite-guild.eu/upload/smfpics/legion/en/dragonsmsmall.jpg) (https://www.infinite-guild.eu/upload/smfpics/legion/en/dragonsmbig.jpg)