Not sure if this has been mentioned, and it might seem a bit tenuous, but the mythology is still interesting to read into.
Robert W. Chambers was an influence on another horror writer,
H.P. Lovecraft. His best know works are known as the the
Cthulhu Mythos (lots of stuff involving ancients Gods and mythological entities).
If you want something looking like a spaghetti monster, Lovecraft's
Cthulhu seems pretty close.