Old School Fantasy Role-Playing Game Supplements and Sourcebooks
Welcome to the Castle Oldskull gaming site!
Explore Kent David Kelly’s full range of bestselling e-books for Advanced, Basic, and Expert fantasy role-playing systems.
Hail and welcome, adventurer.
You stand now at the gated vigil of the Free City State of Grimrook. What would you like to do?
Artwork by Tan Ho Sim
Castle Oldskull gaming supplements enhance your tabletop experience with exciting new ideas and iconic imagery, bringing the worlds of your imagination to life.
Explore a vast array of Game Master and Player options for dungeon design, world creation, character classes, monsters, treasures, lone wolf solo play, and more.
PDF E-Book, 220 Pages
$4.99 fulfilled by DriveThruRPG.com
The original Mithral-bestselling guide to Gygaxian & Arnesonian era dungeon design.
Dungeon Design Module CO1, first in the Castle Oldskull supplement series (and first in the Classic Dungeon Design Guide trilogy).
PDF e-book files are provided to you for immediate download upon purchase.
“Some really impressive stuff in here. Really useful stuff for all writers.”
J. Pinto, co-author of the award-winning RPG Toolbox & Ultimate Toolbox
“This is probably the best dungeon design book I’ve ever read.”
Emily B., Purchaser
“This book brings every dungeon building technique together to show you how to make a mega-dungeon down to room-to-room detail. This book showed me how to put it all together.”
Sean M., Purchaser
“I’ve developed a real appreciation for good, logical, well-written sets of tables for detailing anything and everything in the classic style dungeons that I love. And if I had to pick my top three books of tables and game enhancements, this would unquestionably be one of them..”
Jean M., Purchaser