Hideous Creatures: Serpent Folk (2014)

From publisher blurb:

In this series, Kenneth Hite looks at the creatures, species, and monsters of the Cthulhu Mythos from every non-Euclidean angle. Alternate versions and new explanations provide the same jolt of mythic bisociation that the gods and titans receive in the TRAIL OF CTHULHU corebook. Hite traces these foul things through their legendary history, and provides further clues for any Investigator to follow. Horrific scenario seeds burst and bloom, story spines protrude and deform, in a blasphemous garden any Keeper can harvest.

“The features mingled and merged in a seemingly impossible manner. Then, like a fading mask of fog, the face suddenly vanished and in its stead gaped and leered a monstrous serpent’s head!” They built Valusia before the dinosaurs, and lurk behind half mankind’s darkest cults. Are they extra-dimensional, extra-terrestrial, or just extra venomous? You won’t fool the Children of Yig, in any skin they wear.

Hideous Creatures: Serpent Folk is the fourth installment of the Ken Writes About Stuff #2 subscription, or it’s available as a stand-alone product.