Yog-Sothoth is a cosmic entity in the fictional Cthulhu Mythos and Dream Cycle of American horror writer H. P. Lovecraft. Yog-Sothoth's name was first mentioned in Lovecraft's novella, The Case of Charles Dexter Ward (written 1927, first published 1941). The being is said to take the form of a conglomeration of glowing spheres.
Read more about Yog-Sothoth: Mythos Summary