An official OSE supplement of demons, cults, and dark magic.
For just $6.66, you can reserve the Demonic Grimoire Monster Cards — a set of 60 tarot-sized monster cards designed for Old-School Essentials.
This exclusive incentive is only available to those who reserve before launch and pledge for a physical tier.
Join our campaign to unleash the Old-School Essentials Demonic Grimoire upon your games!
Contained within this 176 page tome:
- 8 demon lords, detailed with their cults, minions, spells, and hellish domains.
- 60 new monsters, from lowly tormented souls to mighty lords of hell.
- 4 new classes: chaos knight, cultist, demon hunter, tiefling.
- 70+ new magic items of fiendish power.
- Demonology: magic circles, summoning, demonic pacts, familiars.
- Referee advice for building demonic campaigns.
- 120+ black & white illustrations, including a fully illustrated bestiary. Art by Lucas Korte, Kennon James, Tony Hough, Matt Stikker, and other leading old-school artists.
- Pristine control-panel layout to maximise ease of reference and minimise page flipping.
Follow now to unleash the hordes of hell!
The Demonic Grimoire is part of OSE Month 2026—a month-long celebration of Old-School Essentials, demons, cults, and dark magic, featuring sister projects from other renowned creators!