SISTR: A Rare Geometry for Mothership RPG Operating Manual for Sci-Fi Horror RPG
$29.99
80 page A5 Hardcover with rules and stats for
SIS/TR as well as a viscous starship adventure
written by George Holland and Justin Sirois.
Book specs: sewn binding, printed endpapers,
A5 size, quality interior paper stock.
“Brooding atmosphere, a.i. gone wrong, and a rich tapestry of gore-soaked hallways ringing out with the screams of the damned await you in SIS/TR: A Rare Geometry. If you like your horror Weird, you won't be disappointed. This thing drips.” _ _ _ Jarrett Crader
Mothership RPG
OSR
Shipping from United States
Processing time
1-2 weeks
Customs and import taxes
Buyers are responsible for any customs and import taxes that may apply. I'm not responsible for delays due to customs.
Payment Options
Returns & Exchanges
Returns & exchanges not accepted
But please contact me if you have problems with your order
Frequently Asked Questions
Are packages insured?
Please note, only orders of $35 or more are insured via USPS.
Wholesale availability
Yes, on books, stickers, and shirts. Please message us for more information.
Reviews (6)
Average:
Sep 2, 2026
Arrived on time and as advertised! Excited to incorporate this in to my MS sessions.
seiteljn
Nov 10, 2025
Excellent quality and fast shipping!
Parker
Oct 23, 2025
Absolutely fantastic quality and shipping was extremely fast.
Eddie Dover
Nov 12, 2024
Interesting game book to use with SIS/TR mini's. Great quality.
Dianne Nicholson
Jun 16, 2024
i ordered this as a father’s day gift for my dad, the book is stunning and was delivered ahead of schedule! super excited to play this module with him
Arlyn Stebenne