Here is an interesting Diety of H. P. Lovecraft ‘s Cthulhu Mythos; The Shub-Niggurath, which has also been referred to as “The Black Goat of the Woods with a Thousand Young”, and also as just “Lord of the Wood”. The Shub-Niggurath is an outer God of Fertility, that is a mother to many numerous other diabolical and venomous monster children. It would make a fantastic Big Bad Mother of all evils type of monster to go up against in a game and/or storyline plot.
There are many fantastic artwork online of the Shub-Niggurath by various artists. Here are some wonderful images of it.
image below from http://jinteki.deviantart.com/art/Shub-Niggurath-442982534
image below from http://actualplay.roleplayingpublicradio.com/2014/11/
image below from https://en.wikipedia.org/wiki/Shub-Niggurath
image below from http://patrickmcevoy.deviantart.com/art/Shub-Niggurath-117036824
image below from http://www.angelfire.com/extreme/kengage/cthulhu/critt14.html
“Ever Their praises, and abundance to the Black Goat of the Woods. Iä! Shub-Niggurath!
Iä! Shub-Niggurath! The Black Goat of the Woods with a Thousand Young!” – from the Whisperer in the Darkness