Ravenloft: The Horrors Within breathes terrifying new life into Dungeons & Dragons’ quintessential Gothic horror setting. By detailing 16 distinct Domains of Dread, the supplement spans the spectrum of macabre storytelling, from unsettling cosmic dread to visceral body horror. While these domains provide a rich framework for extended campaigns—whether you are braving ancient ruins, fending off an endless tide of the undead, or unmasking secrets at a lethal masquerade—the book is equally useful for individual encounters. You don’t need to center your entire campaign around a Darklord to leverage these nightmarish new additions.
The manual is packed with a bestiary of grotesque creatures, each tailored to specific domains but easily adaptable to any setting. Its haunting illustrations alone are enough to ignite your imagination for your next session. If you are looking to truly rattle your players, consider throwing them into the fray with these five formidable monsters from Ravenloft: The Horrors Within.
1
Bodytaker Plant

Infuse your campaign with the paranoia of Invasion of the Body Snatchers by introducing this extraterrestrial menace, which arrives via meteorite. If left unchecked, this invasive flora can consume an entire population, replacing them with perfect biological duplicates designed to harvest more nourishment for their central master. With the ability to communicate telepathically across its network of clones, the main plant can orchestrate deeply unsettling, hive-mind scenarios.
It serves as the ultimate antagonist for a high-stakes mystery that culminates in a grueling battle. The Bodytaker Plant is remarkably resilient; it can use its reaction to offload half the damage it sustains onto nearby podlings, forcing players to methodically clear the room before they can strike the heart of the threat. Furthermore, its predatory vines can grapple and paralyze adventurers, dragging them into pods for a slow, terrifying demise.
2
Gremishka

Image: Wizards of the Coast
Looking to humble an arrogant spellcaster? Send a swarm of Gremishka their way. These mischievous, Gremlin-inspired pests are the byproduct of botched magical experiments. They possess an instinctive disdain for magic, delighting in the destruction of spellbooks and arcane components. Mechanically, they are a nightmare for casters: they hold advantage against magical effects, regenerate health whenever a spell is cast nearby, and can even sever a hero’s attunement to their equipment with a single bite. As a swarming mass, they are also resistant to standard physical attacks, forcing players to rethink their strategy.
3
Mi-Go

Image: Irina Nordsol/Wizards of the Coast
While the prospect of a brain in a jar is chilling, the Mi-Go is arguably worse because it actively turns its victims into one. This extraterrestrial fungus seeks to dominate by harvesting and transplanting the brains of sentient creatures. In combat, the Mi-Go utilizes a disorienting ray to daze and damage its prey before closing the distance with its powerful pincers. If the party fails to rescue a victim immediately, the Mi-Go will perform an extraction. With the capacity to Plane Shift once per day, it can easily vanish into the shadows with its grisly trophy in tow.
4
Necrichor

Image: Wizards of the Coast
Fans of the blood-bending horror seen in Avatar: The Legend of Korra will find the Necrichor deeply disturbing. This malevolent undead entity can infiltrate a host’s body and manipulate their limbs like a marionette, maintaining control until it chooses to depart or the victim is brought to the brink of death. Because it can ooze through microscopic fissures and traverse ceilings with ease, it is an incredibly elusive foe. It excels at sowing discord, forcing party members to turn their weapons on one another until they can devise a way to trap the fluid horror.
5
Relentless Nightmare

The Relentless Nightmare draws direct inspiration from slasher cinema icons. Unlike standard monsters that exist only for the duration of a battle, the Nightmare is designed to haunt players across entire arcs of your campaign. It stalks the party, teleporting at will and draining their vitality with a paralyzing gaze. Its signature cursed spear is especially lethal; wounds inflicted by it cannot be recovered from—even after a long rest—leaving the characters in a state of permanent exhaustion.
True to its name, the Relentless Nightmare is notoriously difficult to banish. Even if reduced to zero hit points, it can respawn from the dreams of a creature it has cursed. It creates an agonizing test of endurance, forcing your players to stay wide awake and hyper-vigilant if they ever hope to lay this terror to rest for good.
D&D’s new Ravenloft book is a worthy companion to its illustrious predecessor
Ravenloft: The Horrors Within is a stellar update, bringing fresh, dark utility to the 5.5e era.
Source: Polygon


