2. Gary Gygax's World Builder
I use this book all the time. It is a collection of lists, kind of like a book-length version of the 1E DMG appendices. Armor, weapons, metals, gems, colors, rooms, geography, buildings, furnishings, crimes, and much more. Invaluable as a reference and for brainstorming.
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World builder books are always popular with me. And something like this would be pretty helpful. I might just pick it up!
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My top five:
1. Call of Cthulu d20 - I love picking it up and reading it, whenever I'm bored. The adventure ideas section is the best in any RPG book, Hands down. I mean, how much space is devoted to ideas? Something like 50 pages!? Great stuff.
2. Dark Sun - The Ivory Triangle. My favourite Setting book, because it really details how two different cities interact with one another (as opposed to saying "here is a place. It is self-contained"), and with the surroundings. Great set.
3. Savage Tide - not really a book (and, unfortunately, it never will be, sniff), but it's just a great set of adventures. Some of the NPCs in it are absolutely brilliant (Avner Meravanchi springs to mind, as does Urol Forol. If either of those NPCs were to bite the dust, my players would revolt!)
4.
The World Builder's Guidebook. Number one on my list, actually. I've used this book so many times, it's almost funny. Lists and random tables that can be used to make a campaign world. I've used it to make oddball settings (Arabic Knights fight Jungle Dwarves while dodging technological dragons! And it's all on an arctic archipelego! Yeah!), as well as making settings that are more traditional, with a bit of a twist (this is where you can get things like theocratic elves with a decaying rennaissance culture, for example). Five out of five stars.
5. Eberron Campaign Setting. Don't own it yet, but my brother does, and I read it whenever I get the chance. Absolutely great setting, even if Shifters, Changelings, and Kalashtar are kind of lame races. And now that I'm in an Eberron game, it's even more fascinating.