Return of the Obra Dinn Wiki
Return of the Obra Dinn Wiki

A shell as seen on page 27 of the catalogue.

Mysterious shells, along with the Formosan chest, are main plot devices in Return of the Obra Dinn. The exact nature, function, or origin of the shells is not explained in the narrative but they serve as MacGuffins, motivating actions of the characters.

The shells are slightly larger than a human hand and emit bright light. They seem to have an effect on some characters, making them want to possess one. This leads to accidents and deaths of several characters in the story. When placed in the liquid that the Formosan chest contains, bright beams are released that then hit other shells in the vicinity.[1]


A shell is first seen in Murder, part 1 when one is in the bottom drawer of the Formosan chest. Second Mate Edward Nichols had opened the drawer before attacking passenger Nunzio Pasqua. The narrative does not explain whether Nichols is after the chest, the shell, or both.

Later, several mermaids are seen having a shell tangled in their hair as they attack Nichols and his party on the open sea.[2] During the battle, passenger It-Beng Sia submerges a shell into the liquid in the Formosan chest, burning his hand but also releasing beams that home in on shells carried by mermaids, stunning them.[1] The sole survivor of the battle, Second Mate Nichols, brings mermaids and their shells back to the Obra Dinn. As the crew moves the mermaids to the lazarette, the cook of the ship, Thomas Sefton, is drawn to the shells. A mermaid slashes and kills him as he tries to reach for a shell.[3]

After two attacks on the ship, the crew gives one surviving mermaid a shell and releases her, asking her to guide the Obra Dinn back to port.[4] The same shell can be seen glowing in the distance when the inspector is aboard the Obra Dinn at Falmouth five years later.

A mermaid holding a glowing shell as Fourth Mate's steward Davey James and First Mate's steward Paul Moss carry her out of the lazarette in chapter VIII, part 4.

Even though one of the mermaids is released, the fate of the other shells the mermaids had in the lazarette is not fully explained. Captain Witterel told some of the crew that he threw the shells into the ocean. This is referenced twice: First Mate's steward Paul Moss refers to this as he, Third Mate Martin Perrott, and Fourth Mate's steward Davey James actually find a shell in the lazarette.[4] Later, the Captain himself says the same, but seaman Henry Brennan refuses to believe him.[5] This occurs as there are only four people alive on board, and previously loyal crew members, including First Mate and Captain's brother-in-law William Hoscut, have stormed captain's quarters, looking for the shells.[6] The mutiny could be due to the shells affecting the otherwise-loyal mutineers, but this is not confirmed in the narrative.


The distant glow of the shell, seen by the chief inspector, can be reached using the game's (normally hidden) debug menu. It is much closer to the ship than it appears, and is simply an object floating a few feet above the water level.

A circular particle effect with radial lines around it hovers in the right of the foreground. In the background part of the hull of an old sailing ship is visible.

An image of the glow of the mermaid shell visible from the 1807 version of the ship, seen from the opposite side, with the (partially rendered) ship in the background. Accessed using debug and noclip.


  1. 1.0 1.1 Seen in The Calling, part 4
  2. In chapter IV, The Calling
  3. In Unholy Captives, part 2
  4. 4.0 4.1 In chapter VIII, part 4
  5. In The End, part 2
  6. Stated by First Mate Hoscut in The End, part 1 when he says "Open the door – – lest we break it down and take more than those shells."