Gary’s Appendix — Omnibus

Two hundred and sixty-four pages of GM-facing articles, expanded bestiary entries, and the kind of haphazard, useful, and occasionally perplexing material that made the appendices of the AD&D Dungeon Masters Guide the best part of the book. All six foundational issues of Gary’s Appendix — collected, re-laid-out with full-color graphics, and bound into a single hardcover tome.

Each issue of Gary’s Appendix was built around a theme, and the Omnibus preserves that structure. You’ll move from the general-purpose GM toolkit of the first two issues into the haunted corners of Issue 3 (Horror & Supernatural), the blood-and-thunder pulp of Issue 4 (Sword & Sorcery), the oozes and slimes of Issue 5 (Slimed!), and the full draconic treatment of Issue 6 (Dragons). Across all six you’ll find:

• An expanded bestiary running from Acolyte to Zombie, with each entry built on the OSE SRD but fleshed out with mythology, folklore, ecology, and actual table-ready advice for running the creature. Issue 6 alone covers all seven classic dragon types.
• GM articles on encounter design, dungeon building, wandering monsters, weather, sword-and-sorcery adventure design, investigation scenarios, and more — written by contributors including Travis Miller, Zac Goins, Dave Semark, Oliver Brackenbury, Murkdice, and Graham Ward.
• Cults, organizations, and world-building tools including Jeff’s own cult write-ups, Onslaught SIX’s language tree, and Hannah Wolfram’s government-building framework.
• Weapons, magic items, and equipment from Dave Semark’s Forge of the Weaponmaster to Zac Goins’ rules for fighting dragons and undead.

The bestiary entries use Old-School Essentials stats, but the articles are useful at any fantasy table regardless of system. That’s by design — Gary’s Appendix was never about one ruleset. It’s about the spirit of the DMG: grab something weird, make it yours, and use it in play.

Written and edited by Jeff Jones with contributions from over a dozen authors. Funded on Kickstarter by 393 backers.

Hardcover, A5, 264 pages. Print + PDF. Old-School Essentials compatible.