Petersen's Abominations: Mohole - A Modern Day Call of Cthulhu Scenario.

Call of Cthulhu on Discord, Roll20

Call of Cthulhu



About the adventure

You all are members of an OK Parliament Comission to inspect "The Devil's Hole" Oil Rig, secretly repurposed by the goverment to excavate the sea inside UK territory for a newly discovered "Rolot Gas" a gas that is much more efficient at producing energy and its located deep into the seabed. You assignment is to evaluate the progress of the project and determine if it is viable to keep it going ot shut it down. Of course, horror will be unleashed at sea and the only question is, will you be able to escape "The Devil's Hole"? This is an adventure designed for convention play, so it should last for one session, 3 or 4 hours long, for 3 to 6 Pregenerated investigators. Beginners are also welcome as well.

Professional Game Master

Leopoldo "Leovor" Rueda


17 Reviews

Published Writer

22 years as a TTRPG player

22 years as a Game Master

1 game hosted

Brings Call of Cthulhu pretty much everything Chaosium has ever published, ask for a scenario or campaign and I will most likely have it. Also Old School Essentials, Alien RPG. Cyberpunk RED coming soon! to the table

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Leopoldo "Leovor" Rueda profile

Additional Details

How to prepare

Computer and Internet required. High speed internet will make for a more enjoyable experience. Mic and headphones required (speakers cause echo). Set up free accounts on Roll20 and Discord. Recommend Chrome or Firefox browser. Install Discord app on computer. Join Leovor's Keep server (link on your dashboard here after you join the game).

What I provide

I will bring my 20+ years of experience running Call of Cthulhu games for different kinds of people, old or young, new or experienced; friends, strangers and strangers who then became friends by playing together. The dice are rolled on Roll20 VTT, characters sheets, portraits, handouts with clues found during play and some illustration. Background music played through the Roll20 web VTT.

Gameplay details

Some combat might come up, nothing crunchy, more cinematic than anything. Since its a one shot we will take the first 30 min or so to talk about the game.

Content warnings
  • Blood
  • Body Horror
  • Death
  • Drugs (addiction, use, withdrawal)
  • Gore
  • Drowning
  • Deep or Large Bodies of Water
Safety tools used
  • Breaks
  • Debriefing
  • Session 0
How will character creation work

Pregenerated Characters only, first come, first served. They will be ready for selection in Roll20 as soon as you join (check links in your dashboard once you book the game).

Players can expect

  • Combat/Tactics: Medium
  • Roleplay: High
  • Puzzles: Medium
  • Experience Level: Open to all

Player reviews (17)

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Petersen's Abominations: Mohole - A Modern Day Call of Cthulhu Scenario.

17 Reviews

Price per player-session
You will be charged when a session starts


  • Duration: 3 to 4 hours
  • Number of players: 2 to 6 players
  • Experience required: Open to all
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