Great Cthulhu

Great Cthulhu was essentially the one major fuckup of existence. It (he, she, whatever) resided in another universe until Vecna got very desperate and opened a portal to the -------- (where -------- is your unspeakable word of choice). 

Nobody does that shit, ever. For very good reason.

Sun, Moon, and Gribbly Things: Part 1

The Past

The past used to be a perfectly normal fantasy world. Then Armageddon happened. More on that later. 

After Armageddon, three gods emerged as survivors. Those gods now have an uneasy detente a la 1950's Cold War. Early enough for some Red Scares, but not early enough for the tension to become routine.