Necronomicon, Cthulhu, Azathoth

What does everyone think of these? Necronomicon the book by Lovecraft. The Ancient old ones? Cthulhu, Azathoth? This? cultofcthulhu.net/

To me this all is basically the tip of an ice-burg.
The void is a very big place. It has many types of spirits.
Ones some would call a god-level.
Other dark negative realms, I’m sure they exist too.

Fiction

Most likely.