From publisher blurb:
Based on the characters and events from the short tale, The Horror in the Museum, this The Cthulhu Hack Presents release expounds and expands on Lovecraft's words.
“Well—what do you think of It? Now, do you wonder what crushed the dog and sucked it dry with a million mouths? It needed nourishment—and It will need more. It is a god, and I am the first priest of Its latter-day hierarchy. Iä! Shub-Niggurath! The Goat with a Thousand Young!”
Rhan-Tegoth expands the shortened monstrous entry from the core The Cthulhu Hack book with a detailed History, expanded statistics, and powers, side effects and influences of its presence, and new mechanics.