The DM’s Guide is System Neutral

Or at least can be used with any game you may be running, regardless of genre. There are many useful random tables and information any Game Master usually feels are essential at the table while running. For myself, I am constantly turning to the Non-Player Characters section on page 100. Regardless of genre I am running I can always turn to this section and quickly get an NPCs personality whipped up on the spot. This makes for legitimate apprehension in the PCs. If they know the Game Master is rolling up personalities randomly they can’t get all mad at you when the last three armor smiths turned out to be sociopathic cheerful aesthetics! There are twenty tables alone on these two pages, no NPC ever has to be like the other. I don’t even use all of them. I roll randomly four or five times to get the tables I am going to roll on and then roll for results. This mix and match of character traits assures me and my players will have unique NPCs to engage with whenever this level of detail is warranted.

Here is a list of other tables which are useful at the table, no matter the genre!

p. 25, Value and Reputed Properties of Gems and Jewelry

p.12, Character Age, Aging, Disease and Death

p. 215, Appendix F: Gambling

p. 82, Effects of Alchol and Drugs

p. 53, Waterborne Adventures, excellent resource for manual and wind-driven craft!

p. 29, Description of Occupations and Professions

p. 32, Sage Fields of Study and Special Knowledge Categories

p. 36, Loyalty of Henchmen & Hirelings, Obedience and Morale

Really, you should get your own copy of this 1^st edition book and mark it up for all the tables you find useful. If you are running any type of fantasy game the book becomes even doubly useful with the more fantasy specific sections and tables in the book. It is dubbed a “Special Reference Work” on the title page. I would go so far as to call it an “Essential Reference Work” for the serious Game Master as well as the fantasy codex it is.