From Jeffrey Jones, Zac Goins, and a host of wretched writers comes a series of adventures starting in the mortal realm and descending into Hell itself.
Launching alongside Necrotic Gnome's Grimoire and other projects for OSE Month 2026.
A5 Softcover Book, 150+ Pages A cracked and swollen adventure where the party is called upon to investigate a newly discovered crypt spewing putrid water. What follows is a crypt, a ruin, and an ancient mages' tower – all pointing toward an imprisoned demonic avatar and his dark cult.
3 New Player Classes: The Cultist, Inquisitor, and Duelist Knight
16Demonic Cults: Organized into iconic domains
Expanded Bestiary: Filled with demons, angels, and grotesque entities
A DELVING MOST DARK
A5 Softcover Book, 150+ Pages Ill omens have demanded that a nearby ancient shrine be re-secured. All too soon, the party is pulled down to the Lesser Planes where they must barter, sneak, and fight their way through the strongholds of devils and demons if there's any hope of seeing mortal lands again.
Key Notes: (1) All books come with their corresponding PDFs. (2) Non-USA orders are produced via Lulu Print-on-Demand for reduced shipping costs. (3) Hardcover Books (HC) are not available via Print-on-Demand. (4) Full details on each item can be found in the Content and Add-On sections.
Tier Summary:
Both Books.A Delving Most Dark + A Ritual Most Foul (Available in PDF, Print, and PoD) Demon Trio. Both Books + Gary's Appendix 10 (PDF, Print, and PoD) Demonic Appendix. Demon Trio + Gary's Appendix 1-9 (PDF, Print, and PoD) All-In. Demonic Appendix + Blood Sands Collection (PDF, Print, and PoD)
$19 A5 Zine, 48 Pages | $5 PDF Only 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.
Gary's Appendix Omnibus
$45 A5 Hardcover, 264 Pages | $25 PDF Only 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).
Gary's Appendix 1-6
$60, (6) A5 Zines, 280+ Pages | MSRP: $120 HEAVILY DISCOUNTED BACK ISSUE BUNDLE! 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. This is the same content as in the Omnibus, but does not contain the new layout and is in black and white. Also includes the Omnibus PDF.
The Blood Sands Collection
$65, A5 Hardcover + (3) A5 Zines, 140+ Pages | $16 PDF Only ^ONLY AVAILABLE TO US-BACKERS. $65, (4) A5 Zines, 140+ Pages 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.
Denizens of the Blood Sands | 56-page weird-science fantasy bestiary (Hardcover or PoD Softcover).
Adventures in the Blood Sands: Rising Tides | 16-page adventure module.
Journal of the Blood Sands 1 | 24-page system-light setting guide.
Journal of the Blood Sands 2 | 44-page player class & tech guide.
Shipping will be collected after the campaign once the books are printed and ready for fulfillment. We do our own fulfillment for domestic orders, and the print-on-demand items internationally are fulfilled by Lulu. Unless you reach out directly, all non-USA orders will be fulfilled via print-on-demand, and all USA orders will be fulfilled through our print run stock.
Current Estimated Shipping Costs: US: $10+ CAN: $24+ International viaPrint-On-Demand: CAN: $17+ EU: $10+ UK: $9+ AU: $13+ Rest of World: $20+
Timeline: Worse-case scenario, the timeline looks like this. Q2 2026: Crowdfunding Campaign. Proofs ordered. Q3 2026: Digital fulfillment and printing. Q4 2026: Fulfillment of physical items.
Jeff Jones | Publisher & Layout Jeffrey publishes a variety of RPG supplements and is usually behind the editing and layout. Additionally, he writes articles, herds cats and produces RPG Ramblings, a podcast interviewing creators in the Tabletop RPG Hobby.
John Bilodeau | Illustrator John is a freelancer illustrator in Toronto, Canada focused on pen and ink illustrations for ttrpg games. John has contributed to indie projects for OSRIC, Shadowdark, DCC and Dragonbane. Most re,cently his art has appeared in the 2025 Gongfarmer’s Almanac, the Owlmanac, and Mice of Legend modules. He also creates stock art packages for his Patreon supporters and for sale on Drivethrurpg. Check out his portfolioand Patreonto support his artwork.
Robert M. Everson | Editor Bob is a multiclass editor/proofreader/game designer who cut his RPG teeth on D&D back in the 70's. He can be found most often behind the scenes at Gnome Stew, a website devoted to generic Game Mastering advice which won several ENnie Awards for Best Blog during his tenure, co-hosting the Misdirected Mark Podcast on the Polygamerous Podcast Network, or working on games as a partner at Encoded Designs. He's also worked extensively with Angry Hamster Publishing, Engine Publishing, and Third Eye Games.
Lisandro "Lixu" Linares | Writer & Converter Lixu is a game designer, specializing in conversions of old TSR settings into OSE, with the aim of modernizing them while keeping the magic that makes them special in the first place. His work includes theDark Sun and Spelljammer conversions, plus an ongoingAppendix L series.
Zack Allen | Writer aka Your_Neon_Overlord, is a freelance writer, editor, & amateur map maker. Writer and designer for various titles compatible with Mörk Borg, Mothership, 5E, and more. Enjoys hiking, kayaking, photography, horror media, crafting the perfect playlist, anything Southern Gothic, the color pink, and the occasional trip to outer space...when he's not busy wildly throwing ideas at the wall––but most of all he loves his amazing dog Dudley and his incredible wife.
John Baltisberger | Writer Multi-award winning author and game designer of speculative and genre fiction and gonzo games. Writes brutal splatterpunk, occult musings, and innovative prose in sci-fi, fantasy, horror, poetry, nonfiction, and romance genres. Edits, writes, and designs games like the Wandie-winning Odd Gobs and the Ennie-winning Obscure. Known for his novelizations in the MÖRK BORG space. Creative Director of Madness Heart Games and Sr. Narrative Designer of Vast Grimm.
Daniel Fox | Writer Creator of ZWEIHANDER RPG. Developer of Blackbirds, Fever Knights, Flames of Freedom. Designer of kids' board games (Pete the Cat, Very Hungry Caterpillar, I SPY, Dog Man, Daniel Tiger, Briarpatch). A miserable little pile of secrets.
Zac Goins | Writer Zac has written for dozens of publications, including entries in D&D 5e, Marvel Multiverse, Mork Borg, Mothership, OSE, Pirate Borg, Vast Grimm, Zweihander and more. In another realm, he is the Director of Marketing for Limithron and the former god of death.
Andrew Hindenburg | Writer A jack of all trades, Andrew has spent extensive time operating game stores, working conventions, and serving as an award-winning professional GM, in addition to freelance writing. He's designed for a variety of systems, including Mothership, D&D 5e, the Marvel Multiverse RPG, and a collection of system-neutral releases.
Frank Tedeschi | Writer When not wearing a lab coat working as a Biochemist, he spends time writing, designing, and running Dead Box Games, publishing weird and immersive TTRPG content thoughtfully crafted to inspire unforgettable stories like Goblin Teeth, Bleaksprout, and Spirewitch, with more projects in development. Recently had the pleasure of contributing writing and design for a number of projects, including Devoured Labyrinth, Pocket Saga, Skarr Awakened, and of course, Raptor Ruckus.
William "This Effin' GM" Tramp | Writer & Editor Will has written multiple products for D&D 5E (DMsGuild), and is featured in Zweihander: Reforged, but that's not nearly as impressive as the time he ran a mile in under 4 minutes, 20 seconds. You can find him on Youtube, Twitter, Tiktok, Etsy, and BlueSky: @ThisEfiinGm.
Old-School Essentials Month
Old-School Essentials Month is a group-collab project led by Exalted Funeral and Necrotic Gnome, featuring a new 176-page OSE book — the Demonic Grimoire — and sister projects from 16 other renowned creators in the OSE community.
The theme of OSE Month 2026 is: DEMONS! Get ready for hordes of new monsters, adventures set in the realms of hell, fiendish new character options, and lashings of blood-dripping art.
Group Achievements
We will be announcing a series of achievements tied to the success of all OSE Month projects jointly! To start with:
All projects funded: When all OSE Month projects fund, we will arrange a community Ask Me Anything session on Discord, featuring creators from across the projects. This will be a chance to chat with the OSE Month creators about their projects.
Old-School Essentials (OSE) is a role-playing game of fantastic adventure inspired by classic games of the 1970s and 1980s. Players delve into forsaken ruins, battle fearsome monsters, explore haunted forests and perilous mountain ranges, sail the high seas in search of lost lands, recover fabulous treasures, and unearth secrets of ancient magic.
