I'm trying to write an adventure based around a Chaugnar Faugn cult and I'm trying to think what monsters might be good for such an adventure, either as cult leaders or pets or something like that.
Chaugnar is one of the less classically "Lovecraftian" of the Great Old Ones so I'm trying to avoid the basic tentacled aberration cliches. Hags also seem like obvious choices for any spooky hinterlands cult but I feel like I've been overusing them lately.
Chaugnar Faugn is outlined in In Search of Sanity, book 1 of the Strange Aeons adventure path, on page 66. He originates from a novel called The Horror from the Hills, by Frank Belknap Long, but I have not read it.
Perhaps a cult of nihilistic or anarchist worshipers follow Chaugnar with an apocalyptic view of the world and are trying to bring about its end either immediately or through driving the sentient races insane enough to do it on their own.