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This subject is written on a topic in the real world and reflects factual information. This subject contains information from the Expanded Cthulhu Mythos, and not based on H.P. Lovecraft's works directly. "They Thrive in Darkness" is a short Cthulhu Mythos story by American author Ron Shiflet.


Two recently-acquainted Arkham men investigate a mysterious door in one of their basements. After blacking out during an exploration of the tunnel which lies beyond, the man who was visiting wakes up alone in a nightmarish cavern system deep underground. Stumbling through the labyrinthine tunnels, he eventually happens across the other man, who is in the company of a pack of ghouls, a pack which includes a notorious figure from Arkham's past.


  • Owen Blake, a curious man on the road to becoming a meal for a pack of hungry abominations.
  • Vincent Underhill, a rare book dealer with a dark family history.
  • Richard, a ghoul.

Publication History

"They Thrive in Darkness" was first published by Chaosium in the anthology Arkham Tales: Legends of the Haunted City in July 2006, and again in the collection of Shiflet's own work They Thrive in Darkness: Mythos and Madness in June 2018.