I would like to run False Hydra but in Call of Cthulhu.
A False Hydra is a creature with a skill to erase someone from everyone's memory after devouring them, what's more, it can be seen only in mirrors or when it stops singing (when it sings and you are within its range, you are hallucinating and can't see trails of blood, holes in buildings, etc.).
The climate fits perfectly and the story can be adjusted to the system without a problem, but I have one concern - Is there a Lovecraftian creature which is anyhow similar or at least some spells in the rulebook that can cause False Hydra effects, or should I just homebrew this creature? From what I know the False Hydra is not canon in D&D as well, but I would like to know if there is anything similar in CoC.