The Overprepared GM
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    Chapter 3: In the Room with Ralph

    Jun 08, 2018 1 Comment

    Previous: Chapter 2: The Drowned Fish As I approached my room, I could see Ralph waiting next to the door. When I was about an arms-length away, he finally noticed me and opened his mouth to talk.

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  • World Building

    RPGs in a Mesoamerican fantasy setting

    Jun 06, 2018 1 Comment

    Recently, I was fleshing out a nation in my fantasy setting that I wanted to be mostly inspired by ancient Mesoamerican cultures.  I also had a few ideas from gold rush California, Argentinian

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  • Scathach Serial

    Chapter 2: The Drowned Fish

    May 23, 2018 4 Comments

    Previous: Chapter 1: A Damsel in Distress Going back to the school covered in blood and dirt and saliva was out of the question, but the Fish was close by and Manny would let me clean up enough to

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  • Tools

    Skillful Investigations with Tearsheets

    May 19, 2018 3 Comments

    One of my priorities in how I GM is that I want the players to be active and engaged, not just act as my audience.  So when I started planning out a new adventure with a heavy investigation

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  • Scathach Serial

    Chapter 1: A Damsel in Distress

    May 16, 2018 4 Comments

    As a player, I like writing backstories as vignettes rather than surveys or lists.  Mostly they're a page or two to communicate personality and motivation.  But one time a backstory kind of got

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  • Inspiration

    Stealing from the Coalition of Mages

    May 13, 2018 No Comment

    There are a bazillion different takes on the fantasy genre (yes, I counted), but Amy Raby's Coalition of Mages series is the only one I know of based on the Indus River Valley civilization, circa

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  • Mechanics

    Power Sources 2: Divine Power Source

    May 09, 2018 2 Comments

    In the last post,  Power Sources I: Polishing a Half-baked Idea, I described my general approach to creating a power system as part of making a D&D 4e homebrew.  So, let's walk through the

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  • Mechanics

    Power Sources 1: Polishing a half-baked 4e idea

    May 04, 2018 2 Comments

    In D&D 4e, the developers categorized classes in terms of combat role (controller, defender, leader, and striker) and power source (arcane, divine, martial, primal, and psionic).  The compulsive

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  • Game Prep, World Building

    Noticing my Female NPCs

    Apr 30, 2018 3 Comments

    I was reading through a set of ten-year-old Dungeon magazines trying to find just the right module to play, when I noticed something.  No women.  Every one of the modules I had sticky noted was

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  • Inspiration, World Building

    Stealing from T. Kingfisher

    Apr 25, 2018 6 Comments

    T. Kingfisher is the pen name for Ursula Vernon. She's won a bunch of awards for her stories and comics and novels, and I highly recommend reading some of her short stories to get at least get a

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About the Site

The Overprepared GM blog was started at the suggestion (cajoling, extortion, whatever) of my best friend L.  The intention is to post entries  twice a week about…

  • Adapting material from one medium or setting to another
  • Adventure modules, pre-made character, or other downloadable content
  • How-tos on creating various GM tools
  • Mathematical analysis of various aspects of the system I create, or maybe of ones I’ve tried and reverse engineered
  • Books and movie reviews, focusing on interesting world building ideas
  • Advice on GMing

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