When We Have Come to This Place: The Aliens Series as Cosmic Horror | Tor.com:

In cosmic horror, meanwhile, the villains (whom I am going to refer to as The Horrors, to distinguish them from other villains) are built on a vastly different scale along many possible axes. Often, they’re millions or billions of years old; they’re immune to weapons; they’re able to modify the laws of space and time; they have other powers that humans don’t have and can’t acquire; and they’re just generally so over-the-top Every Adjective In The Dictionary that humans often can’t even look at them (or think about them, depending on the story) without losing their grip on reality.