Storm Dragon
From Flexible Survival
The infection commonly known as the Storm Dragon doesn't look especially dragonlike to many people, but some claim that it is in fact a nanite-born mimicry of a type of true (supernatural) dragon, one born of elemental storm energy. Of course, it might just be yet another bizarre creation of the nanites, merely a patchwork of random bestial and human traits. Regardless of the truth, those infected with this nanite strain are known to have a command over lightning which makes the strain's name at least descriptively, if not literally, true.
Art showing this form: http://t.facdn.net/11187693@400-1374849488.jpg