A downloadable campaign

Buy Now$2.00 USD or more

A sandbox campaign for the Mothership Sci-Fi Horror RPG or your favorite Sci-Fi RPG system originally made for the Mothership 3rd Party Mega Bundle.

This pamphlet supplement ties twelve 3rd party Mothership adventures together for convenient use in sandbox campaign play. It features:

  • A gorgeous pixel art map keyed with all included adventure locations plus extra points of interest to fill in with your own material.
  • Hooks, rumors, and clues that create a robust web of connections between adventures and reward exploration.
  • A job table modified by the party's local reputation. Pursue notoriety or credibility to gain lucrative pirate or corporate contracts.
  • Warden advice for running a sandbox campaign in Mothership.

This sandbox campaign includes locations from the following adventures:
Alcor Station
Diminishing Returns
Dinoplex: Cataclysm
Echoes in the Graveyard
Green Tomb
Moonbase Blues
The Black Heart of Paradise
The Black Pyramid
The Last Nebula
Welcome to ERF

Written by Ian Yusem
Layout by Eric K. Hill
Art by Ribston Pippin

CategoryPhysical game
Rated 5.0 out of 5 stars
(18 total ratings)
AuthorIan Yusem
TagsHorror, mothership, OSR, Sci-fi, Tabletop role-playing game


Buy Now$2.00 USD or more

In order to download this campaign you must purchase it at or above the minimum price of $2 USD. You will get access to the following files:

TheThirdSector_v1.pdf 133 kB
TheThirdSector_Print_v1.pdf 103 kB


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This is a truly awesome trifold that almost defines a new genre, the plug and play 3rd party product campaign.  I am super invested in Hull Breach vol 1, and can't wait to see the 1e versions of the trifolds.  I truly think were it not for that awesome project, we would have seen this trifold expanded into a larger collaborative project, because there is so much here, yet it's so simple.  Great work Ian!

Hi Ian! Happy New Year! I was a little bit offline these last days and I haven’t seen the Mega Bundle offer. Do you think it's possible to do an exception and allow me to buy it... a little bit later. Thanks in advance, with best regards. Nefal


Hi Nefal. Unfortunately the bundle doesn't work that way, I can't turn it back on now that it's over.


I already own all the books included in the bundle. Is there any way to purchase The Third Sector besides paying $20?


Hey! For the duration of the bundle at least, we're keeping The Third Sector exclusive to the bundle. After that, we'll consider finding a way to release it for folks like you who already own the included adventures. So, not yet.

Thank you.