@BigFatFae
A modern replacement for external, unknowable horrors is horror coming from alienation with the self. Reading about modern studies on neuroscience, consciousness and identity, where we're told that the mind makes decisions faster than consciousness can follow, and consciousness doubles back with a false story saying "I decided that because of [reasons]" when reason wasn't a factor at all...

The true eldritch horror is that we think we're real, when we're just self-deluded rivers of words strapped to a meat machine that would do just fine without us.