The Aberration Grimoire is a bestiary and campaign supplement for Dungeons & Dragons 5e, crawling with horrors that do more than kill—they rewrite, reflect, infect, and devour. This book brings the strangest creatures in the multiverse to the forefront with four dominant factions, 90+ custom aberrant stat blocks, powerful boss monsters, magic items from beyond reason, and an arsenal of DM tools to distort your campaign at every level.
Whether you’re building a psychic dungeon, running an ooze-drenched cult conspiracy, or launching your players into the dream-torn lair of a forgotten god-mind, this book gives you everything you need to make aberrations terrifying, philosophically dangerous, and narratively central.
What’s Inside The Aberration Grimoire?
The Overview – What are aberrations, and why do they matter in your world? Learn how to incorporate identity horror, unreality, and psychic dread into any campaign.
A History of Aberrations – From cosmic outsiders to psychic parasites, discover how aberrations have evolved through D&D’s history.
Incorporating Aberrations – Guidelines for turning these horrors into main antagonists, factional powers, or environmental forces.
Four distinct aberrant factions, each with their own ideology, biology, and vision for reality:
The Synaptic Spire – Mind Flayers who no longer want to rule—they want to integrate. Neural networks, echo-clones, and mass psionic convergence.
The Eye That Waits – A reflection-born hive of Beholders and dream-seers who seek perfect symmetry by collapsing all identity.
The Maw of Many Hungers – An apocalyptic hunger that speaks in rot and prophecy. Slimes, oozes, and stomachs that remember.
The Slithering Depth – Aboleths who rewrite history, gestate false identities, and drown civilizations in shared memory.
Also includes the Factions Interaction Table – explore alliances, betrayals, ideological paradoxes, and parasitic rivalries between the aberrations themselves.
Each faction includes:
— History, Goals, and Lore
— Their most sacred environments and psychic strongholds
— The leaders behind their campaigns (CR 4 to CR 12 bosses, each with Legendary and Lair Actions)
— Adventure hooks, infiltration methods, and their long-term plans for the world
From low CR psychic parasites to towering thought-devourers, this book is packed with factional horrors and faction-neutral nightmares.
— 90+ original aberrant stat blocks
— Includes all-new Boss Creatures for each faction
— CR range: 1/2 to 12
— Each creature includes tactics, lore, and story integration notes
— Thought parasites, dream-walkers, memory leeches, mirror-beasts, echo-clones, psionic oozes, false prophets, and SO MUCH more
A rich narrative section exploring aberrant philosophy, world-breaking rituals, and cross-module lore connections:
— The true Maw versus the false cult
— Theories on consciousness as terrain
— Echohalls, Cortex Fields, and Memory as Dominion
— Factional debates on identity, recursion, and devourment
From Common to Legendary, the Grimoire features strange and terrifying loot like the Mawcarved Blade and the Mirror of the Third Glance tied to aberrant themes:
— Memory talismans, mirrored rings, and psionic grafts
— One Legendary Ring, Robe, and Staff—all unforgettable and potentially campaign-breaking
Bring the madness to life with tools that enhance gameplay, distort storytelling, and expand adventure options:
— Aberrant Dungeon Effects Table
— Corruption Tracker
— Mutation Table
— Aberration-Themed Adventure Hooks
— False Identity Generator
— Memory Echo Table
— Dream Intrusion Engine
— Aberration Encounter Balancer
— Lair Hazard Generator
— Aberrant Terrain Effects
— Cult Creation Toolkit
— Aberrant Infiltration System
— Random Aberrant NPC Generator
— Sanity Variant Rules
— …and so very, very much more
Because aberrations aren’t just monsters.
They’re viruses of the mind, ideologies with teeth, dreams that replicate.
This is more than a monster book—it’s a reality-fracturing toolbox for DMs who want to infect their players with fear, awe, and a creeping sense that nothing is what it seems.
— 90+ stat blocks
— 19 magic items
— 20+ DM tools
— 15 boss-tier aberrants
— 4 fully fleshed factions
— Infinite paranoia
You’ve seen them in the dark.
Now see what they’ve seen of you.
License: Roll20 End User License Agreement
(Personal Use Only, Do Not Distribute)