"The most merciful thing in the world, I think, is the inability of the human mind to correlate all its contents. We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far. The sciences, each straining in its own direction, have harmed us little; but some day the piecing together of dissociated knowledge will open up such terrifying vistas of reality, and of our frightful position therein, that we shall either go mad from the revelation or flee from the light into the peace and safety of a new dark age." - H.P. Lovecraft.
The Lovecraft Grimoire is the ultimate expansion for Dungeons & Dragons 5e, plunging players and Dungeon Masters into the abyss of eldritch horror. This compendium brings 93 new creatures, 30 eldritch magic items, 21 unique rituals, and an arsenal of revolutionary DM tools to weave the madness of the Mythos into your campaign.
Whether your story explores the rise of the Great Old Ones, the whispers of cultists, or the horrors lurking beyond time and space, this tome arms you with everything needed to create a campaign of insanity, dread, and incomprehensible terror.
Theme Overview – The essence of Lovecraftian horror and how it translates into 5e.
Lovecraft: An Indescribable History – The real-world origins of the Mythos and its evolution.
Incorporating the Unknown – How to seamlessly integrate eldritch horror into your campaigns.
Overview of the Creature Index – A breakdown of horrors lurking within these pages.
Campaign-Level Threats – Cosmic beings that cannot be fought in conventional ways.
The Coming Doom – The slow unraveling of reality as eldritch gods stir in their slumber.
From mortal cultists to unspeakable cosmic entities, this index provides creatures for every tier of play:
CR 1/8–CR 1/2: Peons and low-tier horrors like the Acolyte and Salt-Husk Initiate
CR 1–CR 4: Basic Horrors. Unnatural aberrations such as the Charnel Lurker and Deep One Hybrid
CR 5–CR 10: Greater Horrors. Terrifying entities like the Spectral Hound and Brain Canister Abomination
CR 11–CR 16: Elite Horrors. Reality-bending creatures such as the Faceless Harbinger and Dunwich Horror
CR 17–CR 22: Ancient Level Horrors. High-tier horrors like the Shoggoth, Obed Marsh, and Haunter of the Dark
CR 23+: Unspeakable Cosmic Horrors. The Spawn of the Nuclear Chaos, Ghatanothoa, and Cthulhu Fully Awakened
Each creature includes detailed descriptions, combat tactics, and lore-rich mechanics that make them feel distinct and terrifying.
Artifacts and trinkets imbued with eldritch power, mind-warping abilities, and horrifying costs:
Common to Legendary Loot: Eldritch weapons, cursed relics, and unknowable tools of the Old Ones.
Cosmic Artifacts: A new tier of items, so powerful they demand a fatal price from their wielder.
Expand your magic system with rituals ranging from minor invocations to world-breaking rites:
0-Level Cantrip Rituals: Small but unnerving powers, such as Whisper of the Abyss.
1st-5th Level Rituals: Unholy summonings and protective sigils, like Seal of the Sleeper.
6th-9th Level Rituals: Reality-warping incantations, such as Invocation of the Colour or Call to the Stars.
These spells offer long-term consequences and deep narrative weight, making magic feel truly dangerous.
This grimoire isn’t just a bestiary—it’s a toolkit for immersing your campaign in true cosmic horror.
Cultist Interaction Tables – Motivations, behaviors, and ranks of eldritch cultists.
Create-A-Cultist – Customizable tables for unique NPCs.
Dynamic Eldritch Lairs – Ever-shifting nightmare landscapes.
Mind’s Eye Dungeon Design – Running non-Euclidean dungeons without a grid.
Boons and Curses – Gifts from the Great Old Ones with severe consequences.
Eldritch Awareness System – A trackable sanity mechanic balancing insight vs. madness.
Random Encounter Tables – Horrors lurking in coastal towns, forgotten tombs, and alien voids.
Fear and Suspicion Tracker – How NPCs react to paranoia and growing cult influence.
Eldritch Corruption System – Physical and mental mutations over time.
The Doom Clock – A ticking countdown toward inevitable catastrophe.
Cosmic Horror and Sanity System – A knowledge vs. madness mechanic.
Forbidden Tomes and Eldritch Knowledge – What’s inside the Necronomicon and what it costs to read it.
Ritual Sacrifice Tables – What must be given to call upon the Great Old Ones.
The Unreliable Narrator – Mechanics for altered memories and shifting reality.
Mythos Artifact Generator – Eldritch relics and their terrible prices.
Eldritch Dreams and Nightmares – What happens when the horror follows you into sleep.
Mutation Mechanics – The grotesque transformation of those too far gone.
Strange Omens and Signs – Subtle clues that reality is unraveling.
This is not just another monster book. This grimoire transforms your entire game world, creating an atmosphere of creeping dread and existential horror.
—Over 90 unique creatures with horrifying lore, tactics, and abilities.
—An arsenal of eldritch items, from cursed relics to cosmic-tier artifacts.
—A deep, thematic magic system, expanding ritual casting into something truly horrifying.
—DM tools that reshape your campaign, from non-Euclidean dungeons to the ticking Doom Clock.
—The Great Old Ones stir in their slumber. Madness seeps into the world. Reality fractures.
Will your players survive the horror—or become part of it?
License: Roll20 End User License Agreement
(Personal Use Only, Do Not Distribute)
