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I am interested in running an open table along the same lines described by this Alexandrian post and I want to use the original Judges Guild Caverns of Thracia.

I can find a compatible OSR game I'm sure (I want something that has a free PDF rulebook and super-quick character creation, to suit having casual players at an open table), but I need to know what edition of D&D I'm looking for a match with. What edition of D&D was Caverns of Thracia written for and is compatible with?

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  • \$\begingroup\$ We can't recommend a game for you (game-recommendation questions are off topic here), but we can certainly answer the question about what edition of D&D the Caverns of Thracia is for and let you go from there. I've edited the question to focus on that. \$\endgroup\$ – SevenSidedDie Jul 13 '16 at 3:21
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The Caverns of Thracia is compatible with Original D&D, Holmes Basic, and AD&D First Edition. To the extent that AD&D Second Edition didn’t change much of the basics, it is also compatible with that, and the same is true of the later Basic/Expert/etc. and Rules Cyclopedia versions of D&D.

Thracia reads like a mashup of OD&D and Holmes Basic or AD&D, which is how many of us gamed at the time. For example, at least one encounter (the cleric Holoste from room 84) has their alignment given as Lawful Evil (LE). The two-axis alignment system was created for AD&D, though it first saw print in Holmes Basic. The OD&D and later D&D B/X series used the one-axis alignment of Lawful/Neutral/Chaotic.

Thracia was copyright 1979, by which point the AD&D Monster Manual, Players Handbook, and probably Dungeon Masters Guide had been released (the Dungeon Masters Guide was also released in 1979). This was a time of transition. Dark Tower, released the same year, was marketed as a supplement for AD&D.

According to Jaquays, part of the reason Thracia was marketed as for D&D is that Thracia used house rules, and the licensing requirements for D&D supplements were less strict than for AD&D supplements:

Even Dark Tower got a bit of a reaming from TSR … I was including house rules elements in my design of an AD&D product … which was verboten. That’s partly why Caverns of Thracia ended up under the D&D brand … I could be more loose with my interpretation of the rules.

But the actual adventure was written for the author’s own campaign, which by then had transitioned to AD&D:

Caverns of Thracia was originally intended to be an AD&D title, just like Dark Tower… My local group had gone 1E AD&D by that point (as much as we could).

The jackal-headed “dogbrothers” in CoT were originally supposed to be AD&D Jackalweres. As those were AD&D-only creatures, I had to recreate them as something else (and I don’t think I could back port the jackalweres … that wasn’t acceptable).

So it was written with a house-ruled AD&D in mind, and edited with OD&D in mind. It’ll be compatible with any rules set that is compatible with those, which covers most of the OSR rules sets and even second edition AD&D and B/X D&D up to the Rules Cyclopedia.

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    \$\begingroup\$ Wow, this is amazingly detailed. I come from times of strict rules and compatability so figuring out things from the times before is hard but mostly because of my own beliefs. \$\endgroup\$ – Kasuko Jul 19 '16 at 21:29
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According to RPGGeek, it was written for Original ("White Box") D&D.

There are several retroclones available that are more or less compatible with "White Box" rules. (Even BECMI or AD&D-1e are not too different.)

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  • \$\begingroup\$ Thanks, I still find all this OSR pretty difficult to decipher. The white box information really helps! \$\endgroup\$ – Kasuko Jul 13 '16 at 15:46
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There is a version of Caverns of Thracia that was written for D&D 3.5 on drive thru rpg if that helps. I remember seeing it there a few weeks back when I was looking for old modules to work into my campaign setting. I would link it but I'm new to stack exchange and don't know the rules regarding links. The original was way before my time so I can't help there sorry.

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    \$\begingroup\$ Thanks. I also saw that module but it's recommended for players level 3+ which would make it very difficult to accept new players as they would have to learn a lot of the intricacies of player creation in 3.5e which is not simple. Maybe I will run that with my 3.5e group though. \$\endgroup\$ – Kasuko Jul 13 '16 at 15:47
  • \$\begingroup\$ Yea you would have to put a little work in scaling it back for your group. Hope you find what you need. Have fun \$\endgroup\$ – user30185 Jul 13 '16 at 17:40

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