Unleash Hell! OSE Demon Month is live on BackerKit!

Join the circle and summon the forces of Chaos this May in a crowdfunding bonanza that will shake the gates of the underworld.

At the heart of the infernal horde is the Old-School Essentials Demonic Grimoire, a 176-page tome of fiends, sinister player options, dark magic, and referee tools for all your OSE demonic needs, from adding a little firepower to your villains and cults all the way up to full-scale demonic campaigns.

In the pages of this fell tome, you’ll find:

• 8 demon lords with their cults, rituals, spells, and infernal domains
• 60+ new monsters, from twisted larvae to towering archfiends
• 4 new character classes: chaos knight, cultist, demon hunter, and tiefling
• 70+ magic items forged in the fires of perdition
• Rules for demonology, summoning, pacts, familiars, and magic circles
• Referee tools for running full-on demonic campaigns
• 120+ B&W illustrations from Lucas Korte, Kennon James, Tony Hough, Matt Stikker, and more

For a little taste of the hell that awaits, feast your eyes on the titan of tyranny that is Bethgor, Father of Chains:

Crowdfunding is LIVE RIGHT NOW on BackerKit, and we’re making you an offer that would make any goatee-stroking archdevil blush with envy. Back now, and all of this can be yours:

• The Old-School Essentials Demonic Grimoire: Available in standard and premium leatherette editions, the ultimate tome on all things demonic for your old-school game.
• A deck of 60+ tarot-sized monster cards, ready to break through reality and onto the table.
• Quick Delve #5: Golden Lies, a compact adventure against a sinister demonic cult.
• The 2026 update of the OSE Referee’s Book and Player’s Book with new illustrations, reams of play examples, and more AD&D-inspired optional rules. Want to know more? See our FAQ.
• 8 postcards, one for each hell realm.
• OSE Demonic Grimoire merch and swag, including t-shirts, posters, patches, and stickers.
  
  

But that’s not all…

16 Collaborator Projects

Our Demonic Grimoire is joined by 16 sister projects from fellow fiends from the OSR creative sphere. Among our cabal of collaborators, you’ll find adventures, gamebooks, bestiaries, artbooks, and more. These projects leverage new content and add their own creative flair, giving you a wealth of treasures to make the most of the Demonic Grimoire right away. Behold:

• HELLCRAWL: A massive, full-colour hexcrawl across the burning plains of Netheria.
• Skullboy's Illustrated Guide to Demons: An artbook of malevolent monsters from the varied fiendish realms.
• Emporium of the Damned: Browse a market of enticing items at infernal-bargain prices.
• The Black Spire Pact: Challenge a friend with this pair of PvP adventure gamebooks where a demon lord and sorcerer try to outwit each other.
• A Ritual Most Foul and A Delving Most Dark: An ‘adventure path’ of linked scenarios connected to the abyssal realms.
• Bekir’s Battlers: Hell Unleashed: Wooden minis of the hordes of hell.
• Out of the Iron Labyrinth: Escape from a demon lord’s realm as a single PC or solo player.
• HELLBLASTER: Against the Cyberfiends: A high-level crashed spaceship dungeon where demons have embraced alien technology.
• The Tiger Princess of Treacherous Tripura: Explore a fantastic city of illusion and intrigue inspired by Vedic myth.
• The Ooze: A pack of zine adventures against gelatinous fiends.
• Abattoir Hymnal: A gore-slicked adventure into the butchered realm.
• Master of Puppets: Hunt the mysterious toymaker and face fiendish factions in this dark, whimsical forest crawl.
• Codex Qliphothica: A bestiary of new horrors from the abyssal realms.
• Dimension Delver's Guide to Demons & Devils: Monsters, items, and adventures await you in this infernal collection.
• Dinner With the Damned: A one-shot funnel adventure to kick off an infernal campaign.
• Mildew and Silver: A first-level adventure set in a crumbling dwarven mining town plagued by cultists and monsters.

Pledge yourself to as many dark powers as you wish! Exalted Funeral is offering discounted group shipping rates for everyone who backs multiple projects, conveying a veritable treasure horde to you on black-feathered wings. Many collaborator projects also offer bonus rewards for backing multiple products!

All Souls As One

As well as discounted group shipping, we’ll also link extra-special rewards to the progress of OSE Month as a whole, track the performance of all the projects, and add more bonuses as we go! 

Our first group funding reward will be a Discord AMA with all the OSE Month creators, but it doesn’t stop there. Gather your party and raise hell for special events, free goodies, and more!

Party in Pandemonium!

Hit the button below to join the OSE Month launch party, where Gavin, the Exalted Funeral team, and OSE Month collaborators will be online live to chat about the Demonic Grimoire, collaborator projects, and other dark secrets.

Stream starts at 1 pm Eastern TODAY!.

Gavin Norman with Mike Mearls, Ben Riggs

The superstar 5e designer runs OSE at cons? Our own Gavin Norman goes head-to-head with modern D&D master Mike Mearls to discuss OSE vs. 5e design, upcoming projects, and more.

Play Demon Month Adventures Online Right Now

To celebrate OSE Month, we’ve teamed up with StartPlaying to run a wave of online OSE games—some featuring the new demon-themed Quick Delve, Golden Lies. Use code OSEM6 for $10 off your first game during the event.