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Aboard the Osmorton
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Aboard the Osmorton


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Aboard the Osmorton is a one-shot horror adventure designed for characters levels 5-8 and is expected to take 2-4 hours to complete. It is a lighter combat adventure with a special betrayal mechanic that adds a unique twist! This adventure is one of the only I have written that I do not suggest dropping in your existing campaign without modifications, as part of the adventure includes one of the party members being infected by a parasite. This parasite takes away their volition and there is no known way to cure it! The infected player will secretly be working to infect the rest of the party and if they are successful then all of the adventurers end up dead by the end of the night.

This is an adventure I still seek to improve upon. I haven’t had extensive enough playtesting of the secret agenda mechanic to know how it works for all groups so I would love to hear your feedback!

Adventure Description

Inspired by The Thing, this adventure sends your party to sea aboard the Osmorton. Mid-way through the trip, the crew rescues a man lost at sea - a man infected by a neural parasite that causes the host to fall under its control. Infected passengers are nearly indistinguishable from their former selves, but want nothing more than to continue to spread the parasite to others. This adventure comes with a unique betrayal encounter that presents an extra level of fun to this one-shot. It is intended for more advanced groups that can dive deeply into their roleplaying and who are willing to approach problems in non-linear ways. Can your players find out who is infected and who is safe before the ship reaches its destination or will Captain Drustan need to scuttle the ship to ensure the survival of humanity?


The Horror Collection

This is one of the adventures included in Nerzugal's Tome of Horrifying Adventures. If you are looking for more one-shots of a similar nature, you can check out the full book and the other adventures here at a discounted bundle price!


Other Titles by Nerzugal

All of my other products are Platinum Best-Sellers or better with an average user review score of 4.7+. They are all also available as PWYW so you can experience over 450 pages of content for free. 

Nerzugal's Dungeon Master Toolkit Nerzugal's Dungeon Master Toolkit 2

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File Last Updated:
January 11, 2019
This title was added to our catalog on January 11, 2019.