Delve the depths of evil with new demons and devils for your Old-School Essentials game, each with full stats and a small adventure showcasing these infernal entities. Perfect for Referees who need a few fiends in low places!
Demons & Devils Galore for your Old-School Essentials Game!
Demonic Influences!
Dimension Delver's Guide to Demons & Devils from Parallel Dimension Gaming collects different demons and nightmarish creatures in a 60-page softcover book designed to work with Old-School Essentials and specifically with the new Demonic Grimoire!
Each vile entity includes a short adventure highlighting the creature! The book also details new magic items you can drop into your game.
Get Dimension Delver's Guide to Demons & Devils in digital PDF form. No shipping and no shelf space needed! This reward will be released to backers shortly after the Backerkit campaign ends.
Softcover with PDF
Get Dimension Delver's Guide to Demons & Devils in printed softcover form and in a digital PDF. This is an A5-sized book (approx. 5.83 x 8.27 inches) with at least 60 pages of content.
The size of the book could increase. For every $2,000 raised after we fund, we'll add a new creature and adventure. This means roughly 4 to 6 additional pages for each new creature added.
At fulfillment, all Digital PDF files will be delivered via DriveThruRPG. The PDF will be sent soon after the Backerkit ends. If you order a printed book, you will receive it as part of the group shipping with the Demonic Grimoire. You will still receive the PDF immediately to read while you wait for the printed version to arrive.
You will need an existing customer account on DriveThruRPG.com to receive your digital PDF rewards. Using their site allows us to keep track of all reward options and ensures backers have long-term access to digital rewards.
Your rewards will be added to your DTRPG account library.
If you need assistance with your digital rewards, please email Customer Service at [email protected] with your backer information.
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.
