Hell has come to Gary's Appendix. Issue 10 plunges into the lower planes with a full lineup of demonic content: six articles featuring summoning rules, infernal contracts, loathsome lairs, and fiends that corrupt from the inside out. Whether your players are foolish enough to call something up from the pit or unlucky enough to stumble into its lair, this issue gives you everything you need to make that encounter unforgettable. Joining the GA10 roster is Shannon Appelcline — RPG historian and author of Designers & Dragons with a deep dive into demons as tempters rather than monsters, drawn from a genuine 17th-century demonological text. It's old-school in the truest sense.

Hardcover, A5, 264 pages. Print + PDF. ONLY AVAILABLE TO US-BACKERS. 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.

140 Pages. 4 Titles > 1 Hardcover + 3 Softcovers. Welcome to the Blood Sands, a mysterious region on the moon Xanathos, and a land of bizarre technology, peculiar inhabitants, corrupt cities, and ancient ruins ripe for exploration. An OSE Sword-&-Planet setting, adventure, player's guide, and hardcover bestiary, perfect for adventures brimming with wonder and peril. Adventures in the Blood Sands: Rising Tides | 16-page adventure module. Denizens of the Blood Sands | 56-page weird-science fantasy bestiary. Journal of the Blood Sands 1 | 24-page system-light setting guide. Journal of the Blood Sands 2 | 44-page player class & tech guide.

Hell has come to Gary's Appendix. Issue 10 plunges into the lower planes with a full lineup of demonic content: six articles featuring summoning rules, infernal contracts, loathsome lairs, and fiends that corrupt from the inside out. Whether your players are foolish enough to call something up from the pit or unlucky enough to stumble into its lair, this issue gives you everything you need to make that encounter unforgettable. Joining the GA10 roster is Shannon Appelcline — RPG historian and author of Designers & Dragons with a deep dive into demons as tempters rather than monsters, drawn from a genuine 17th-century demonological text. It's old-school in the truest sense.

264 Pages. 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. 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.

140 Pages. 4 Titles. Welcome to the Blood Sands, a mysterious region on the moon Xanathos, and a land of bizarre technology, peculiar inhabitants, corrupt cities, and ancient ruins ripe for exploration. An OSE Sword-&-Planet setting, adventure, bestiary, and player's guide, perfect for adventures brimming with wonder and peril. Adventures in the Blood Sands: Rising Tides | 16-page adventure module. Denizens of the Blood Sands | 56-page weird-science fantasy bestiary. Journal of the Blood Sands 1 | 24-page system-light setting guide. Journal of the Blood Sands 2 | 44-page player class & tech guide.