The Shadow on the Sea (Scenario)

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Different Worlds, Issue 47

Pages: M1-M8 (Scenario was published as a tear out supplement intended to be kept in the box with the rules.)

Author(s): Richard Launius

Artist(s): Richard Launius

Setting: 1920s

Appears in: Different Worlds, Issue 47.

Campaign: N/A


While on a relaxing sea voyage, the Investigators notice something odd about one of the passengers. This is intended as an extension to, or a partial replacement of The Mauretania.


Link to outside reviews or helpful pages.

Spoilers - Keepers Eyes Only

Players should not read any further.


 Spoiler Section (Highlight to Read)
The passenger is undergoing a transformation similar to that undergone by Deep One Hybrids, but the end result will be the birth of a new Great Old One, to stand alongside Father Dagon and Mother Hydra. Dr. Roselli summons Dagon to sink the ship, the player-characters must survive on a lifeboat until finally being drawn to a ritual where Ms. Tilton transforms in the presence of Dagon himself.


Player Handouts: N/A

Locations: RMS Mauritania, Strange Island.

Creatures: Cultist, Deep Ones, Dagon

Tomes and Artifacts: R'Lyeh Text, Strange Stones

Campaigns / Scenarios: N/A


Keeper Comments

  • If Keepers do not want to make use of the RMS Mauritania for the setting online deckplans of other ocean liners exist. One has been linked to this article.

 Spoiler Section (Highlight to Read)
This adventure is mostly based on Lovecraft's Dagon, which is a good source of descriptive passages for this adventure.

Experienced players might suspect Dr. Roselli too early in the scenario, so Keepers should prepare for this. Perhaps he manages to throw the stones through his cabin porthole before dying? Similarly, what happens if Mary Tilton is killed on board ship by the players. Perhaps her transformation happens once she hits 0HP?

Note that Dagon's stats are not large enough for him to easily sink the ship. Perhaps Roselli summons the Father-of-all-Sharks for this purpose (see Malleus_Monstrorum for details).

The scenario advises keepers to mix this in with elements of The Mauretania - this is good advice, especially if going with the "it was all a dream" ending - perhaps Prof. Paterson's Glass of Mortlan triggered the dream?

Once the players awake from the dream, expect them to go looking for Dr. Roselli and Ms. Tilton. Are they present, but innocent? Are they missing? Or were they never there?