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. Those who suggest this within range of most Storm Dragons tend to get hit with an Electric Surge, for whatever that's worth...
Art showing this form: http://t.facdn.net/11187693@400-1374849488.jpg