Zircon

This subspecies is the unintentional result of Lightning engineers working on Plague grounds. Employees exposed to industrial accidents often found themselves irreversibly imbued with their own crude oil products, which had become contaminated by the surrounding Wasteland environment. The hardiest employees survived and continued working even as their bodies underwent drastic chemical and physical changes. When these original survivors had offspring, their altered traits were passed down.
Despite the unfortunate circumstances which created Oil Slicks, Lightning workers view them with something like affection and pride—an unorthodox gift from the Plaguebringer! Their Plague colleagues, meanwhile, believe they possess the best of both flights, where one supplied a potent and volatile raw material and the other gave it the means to spread and thrive. Members of both flights eagerly track the spread of Oil Slicks out from contaminated sites with scientific interest.
This subspecies constantly oozes a petroleum-like substance which varies depending on the original oil compound and proximity to the Wyrmwound at the time of contamination. At its most benign, this secretion simply trails wherever the Oil Slick goes. More often it has a tendency to spread outwards from its source and seek both organic and inorganic subjects to soak into.