This is called "Cthulhu Mythos" created by H.P. lovecraft. This is horror fantasy novel about all outer gods which is universe and subgenre of cosmic horror. Cthulhu Mythos was released in February 1928 or April 1936 which two different release dates. it featuring all ancient, incomprehensible alien deities like Cthulhu and cosmic entities

I've three favourite characters from Cthulhu Mythos that I used to loved three of them

Azathoth: a supreme, chaos and eldritch deity of Cthulhu Mythos who's absolutely mindless and unconscious but all-powerful. It is sleeping by music but everything will be destroyed when it wake up from sleep. All outer gods were parts of his dreams. It is also goes by most commonly name "the blind idiot God", "lord of all things", "the boundless Daemon Sultan" and "the Nuclear Chaos"

Yog-Sothoth: knowledge, all-powerful and All-encompassing deity that embodies all space-time and encompassing all existence. It is the grandson of Azathoth but it isn't strong than Azathoth anymore

Nyarlathotep: a malevolent deity who's son of Azathoth becoming messenger and agent for all outer Gods. It is also causing all insanity and has extremely intelligent personality

These are interesting creatures. If everyone can wondering about them and also H.P. lovecraft. I've also interest in this one of best things. Cthulhu Mythos becoming popular because many people making characters with given inspiration of most of outer gods

Outer gods means eldritch, cosmic and chaos deities were created by Azathoth itself. Azathoth also giving birth to most of outer gods who are extremely strong and evil much like Azathoth as well