Evil

Evil is distinct from Nature in that Nature produces suffering as a means to some end not involving agency, in other words by coincidence, while Evil is the specific effort to produce either suffering or some end-product of suffering(subservience, concession, etc.). Evil requires some components of empathy, in other words, an acknowledgement of selfhood beyond the capacities of a landslide or a thunderstorm. Evil is personal, and thus exists only among persons.

It's important to remember, though, that nothing is strictly UN-natural, no more than anything exists without origins. Agents in the world may produce the SuperNatural, outgrowths of Nature which have ranges of variation unconnected to Natural processes; persons, gods, and feelings, along with their associated rationalizations, are examples of the SuperNatural. These ranges of variation fade into irrelevance when the Natural processes propping up persons collapse; ghosts move on, gods are forgotten, and any height of villainy is eventually consumed by the ongoing explosion of the Universe.