Extended universe sigil C'thalpa (The Internal One) is an Outer God described as a huge mass of living, sentient magma, located in Earth’s mantle. She is the mother of the Great Old One Shterot and other five unnamed hideous children. She served by a race of mole-like humanoid burrowers named Talpeurs.


  • Call of Cthulhu RPG (French edition)
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