Not sure if this is the best place to ask, so let me know :)
I'm working on a story idea that features a parasite similar to Halo's Flood, and the Necromorphs from the Dead Space games. Although the parasite has the 'goal' of absorbing all life in the galaxy, it is not necessarily 'aware'. It is meant to be a sort of Lovecraftian deal, with it being no more aware of Humanity than a Human is of bacteria, at least before we invented the microscope.
Given that the Parasite is deliberately malevolent, what is the best word to describe it? I'm looking for a word that encapsulates the same kind of danger as a storm or other natural phenomena, in the sense that a storm doesn't 'care' if it kills you, but without implying randomness or lack of agency. I also don't mind the word not being English, as the concept may be better expressed by another language that doesn't directly translate.
If you are familiar with the Babylon 5 TV series it would be a word that describes the encounter with the First Ones above Sigma 957. The ancient being in question almost killed someone by shorting out the power systems of their spacecraft directly from proximity, and it is explicit in the episode that they are probably not even aware of it.
If anyone has any suggestions as to a word to use, I would much appreciate it.