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Old May 11th, 2016, 12:22 PM
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Default Traveller Theme 2: OTU

This discussion is to clearly spell out the rule/setting combination known as the OTU. I'll keep this OP updated as the model gets refined.

The OTU is a large-ship, traffic-agnostic universe whose setting spans the rules mechanics of Classic Traveller, MegaTraveller, Traveller 4, Mongoose Traveller, and Traveller5.

Its Library Data and Alien Data is perhaps the easiest to describe, being relatively unchanged since its consolidation into MegaTraveller's Imperial Encyclopedia. The setting information in the CT Alien Modules (plus MgT's Zhodani alien module) remains the best source of information on the major sophonts. The Traveller Adventure, the "Adventures" proper, and the Double Adventures are similarly useful - as are MT adventures such as Knightfall (for those enduring the Rebellion years), JTAS, and Challenge magazine content. The latest starcharts are freely available from

Some special-purpose books are also great supplemental material for the OTU: for example, the Sword Worlds supplement from GURPS. Other GURPS supplements work from within the OTU as well (Interstellar Wars), although some make assumptions that need not be made to be OTU (for example, Far Trader assumes a high-volume-traffic universe). Another canonical supplement is the Milieu Zero Sourcebook, a publication from the T4 rules which nevertheless is rules-agnostic and part of the OTU. T4's Pocket Empires also has some setting information in sidebars which describes some of the early conflicts in the Core sector.

The OTU's setting is the most ported of settings between rulesets. Thus the salient features of the OTU tend to be supported everywhere. Note that different rulesets tend to subtly change the way equipment works. That means we need companion discussions like those Wil has done which compare the rules mechanics between versions.

This also means that the OTU also has the largest number of variations, from ruleset to ruleset.
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IMTU tc+ t5++ 3i(+) au ls+ / OTU 44% an+ dt+ ge- j- jf+ n- pi+ pp+ tr+ tv- uwp+ xb+
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Last edited by robject; May 12th, 2016 at 02:53 PM..
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