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Cepheus Engine System Reference Document
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Cepheus Engine System Reference Document

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The Cepheus Engine System Reference Document comprises the core rules for a Classic Era Science Fiction 2D6-Based Open Gaming System. Inspired by the original three books of the oldest 2D6-based science fiction roleplaying game, the Cepheus Engine system incorporates elements of Open Game Content from previous releases of that game of intergalactic drifters and wanderers to create a basic system that will allow players and Referees alike to create their own science fiction universes or play in the ones they are already familiar with.

You'll find the core essence of your favorite sci-fi game here. You can explore interstellar space, make a ton of Credits on speculative trade, find yourself halfway across the sector after a serious misjump, or blow people up with your mind, if you can find training. You can even die during character creation. This stand-alone manuscript provides all the rules you need to play the game. The Cepheus Engine rules were intentionally designed to integrate well with other 2D6-based science fiction gaming systems, especially your favorite Classic Era modules and supplements. All of the material in the Cepheus Engine rules is considered Open Game Content.

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Reviews (7)
Discussions (11)
Customer avatar
HIROSHI I April 21, 2017 2:59 am UTC
Thanks for the excellent ruleset. What is "Prospecting" and "Perception" skills appearing on Skills and Training Table for Belter and Bureaucrat?
Customer avatar
frank S March 31, 2017 12:32 am UTC
There are some typos I think - to find the CharMod you divide the Char by 3 then subtract one? Shouldnt that be subtract 3?
Customer avatar
Jason K April 01, 2017 3:28 am UTC
Technically, it should be subtract 2. 7/3 is 2.333, rounded down to 2. Subtract 2, and you've got a mod of +0.

I'll fix it in the errata'd version.
Customer avatar
frank S May 02, 2017 5:00 pm UTC
oh sorry, that's what I meant but couldn't edit it after I posted it.

Customer avatar
February 01, 2017 7:28 pm UTC
I'd also gladly pay for a nice printed version.
Customer avatar
Jason K April 01, 2017 3:30 am UTC
I'm working with a layout expert to get a print version ready. I'm hoping we'll have it ready soon.
Customer avatar
John L April 05, 2017 12:03 pm UTC
Customer avatar
Morris S April 05, 2017 1:44 pm UTC
Great. That'll be nice to have.
Customer avatar
July 29, 2017 1:26 am UTC
Any update on a POD version?
Customer avatar
Morris S January 13, 2017 1:47 pm UTC
I'd really like to have a printed version of this on or similar. My over 40 eyesight would really find that to be practical and useful.
Customer avatar
Matthew T December 21, 2016 4:24 pm UTC
I've often heard that the rules for economics and trade in Mongoose Traveller are "broken." Does this rules set provide a viable substitute or are they basically the same?
Customer avatar
Jacob R December 21, 2016 4:36 pm UTC
They are different. Mostly the same but with mods. It works well. I don't see why people consider the trade rules to be broken. Sure, it's easy to make a fortune but that's just how the game goes. If there isn't a constant threat of losing that fortune to Pirates debt collectors and other nasties then you aren't playing Traveller right. :D
Customer avatar
Gerald S November 15, 2016 11:47 pm UTC
Also posting to request a print version
Customer avatar
Michael C October 19, 2016 5:56 am UTC
I'd like to echo the print request, plus I'm also seeing a compatibility logo on some people's stuff. I must have missed something, but how do we get that for our products?
Customer avatar
Ian W September 01, 2016 10:15 pm UTC
Does Marc Miller see any royalties from this?
Customer avatar
Shawn D September 01, 2016 11:04 pm UTC
It's not Traveller. So no.
Customer avatar
August 26, 2016 5:53 pm UTC
Hardcover, please!
Customer avatar
Gee A August 19, 2016 2:26 pm UTC
Any chance of a non-password protected version? I'd like to print a copy off using Lulu but the protection makes this impossible (the obvious solution, before anyone suggests it, would entail installing Windows, buying a copy of MS Office, and only then being able to generate a PDF from the .docx -- and I can't do this at work because we don't use MS Office there either!).

I guess what I'm saying is a more convenient option would be nice for us non-Windows users. Thanks.
Customer avatar
Gee A August 20, 2016 2:41 am UTC
Never mind, I discovered that I can simply use the standard 'print to file' option to generate an unencrypted PDF. I also looked at a few other free PDFs from *drivethru and they all use the same kind of password protection so I suspect there's probably nothing any uploader can do about this (short of finding alternate hosting).
Customer avatar
Jacob R July 26, 2016 6:59 pm UTC
Please tell me that you're going to have a print version available.
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File Last Updated:
July 02, 2016
This title was added to our catalog on July 02, 2016.
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Samardan Press
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