Dungeons and Dragons is a magical game full of magical creatures. There are majestic monsters scattered all throughout the lore of D&D, and those that aren't so majestic. Dungeon Masters looking for tips on how to spice up their games may want to look into some of these weird creatures, as the bizarre ones can be an awesome way to get players more involved in a specific region of a campaign, and perhaps even go hunting for more strange creatures, which is always a fun time.
Updated on April 1, 2022 by John Higgs: Dungeons and Dragons continues to expand its Fifth Edition with a seemingly endless array of rulebooks and premade adventures for DMs to run. Many of the recently released campaigns are perfectly suited for weird and wonderful creatures from the Monster Manual to make an appearance. Strixhaven: A Curriculum of Chaos' magical school setting and light tone makes it an ideal choice for DMs who'd like to introduce a favorite monster through a summoning accident or other magical event. Similarly, the Candlekeep Mysteries take players on a wide-ranging adventure, with plenty of opportunities to work in unusual magical beasts and aberrations.
15 Chasme
A Chasme is a classic case of a scientist that accidentally crossed their DNA with a fly's, except in this case the fly is a demon. Like any fly, they're capable of landing on ceilings or walls and are often used as interrogators by more powerful demons. What's most unsettling is the Chasme's long, pointed nose, which would put even the most aggressive woodpeckers to shame.
As a demon, the Chasme is native to the Abyss, the Forgotten Realm's most hellish plane. However, DMs can also insert them into any campaign that features demonic summoning, as they're often sent into the mortal realm to kidnap victims for their overlords.
14 Intellect Devourer
Picture a brain with massive legs. That's an Intellect Devourer. The creature feeds on the intelligence of sentient creatures, and can even take over a body for a mind flayer, which acts as the monster's master. The creature is pretty similar to a licker from Resident Evil, though a bit less unsettling thanks to the absence of a real torso. Still, it's not the type of creature anyone would want to snuggle up with.
Most intellect devourers are bred by mind flayers to patrol and hunt in the areas around their Underdark fortresses. Because of this, DMs should have an easy time inserting them into any campaign set in the Underdark, like the Out of the Abyss published adventure.
13 Grell
Another creature that's mostly a brain, a Grell is seemingly a half-bird, half jellyfish creature. They have no eyes and use a type of levitation to float. However, their skin is sensitive to vibration, and they have an impeccable sense of hearing. They float silently waiting for the perfect moment to strike lone creatures or a straggler in a group, making it a deadly creature too.
Just like the intellect devourer, the Grell is an aberration from the Far Realm that is most often found in the Underdark. Unlike the intellect devourer, Grell are rarely servants of the mind flayers, and instead establish their own colonies for players to stumble over.
12 Aboleth
An Aboleth is basically an octopus made of pure hatred. They're a sort of telepathic fish capable of dominating lesser creatures, at one point even holding an entire empire before the gods destroyed it and freed their slaves. Aboleth are pretty ancient creatures, existing in the primordial oceans of the Dungeons and Dragons mythos, and still inhabiting some of the ruined cities from the peak of their empire, now lost in the depths of the sea.
With their subterranean and aquatic tendencies, Aboleths are most commonly encountered in the stygian seas of the Underdark. However, DMs can also surprise players by having one spread its influence and dominated victims from the sewers of a surface city.
11 Ettercap
Falling pretty sharply in the "humanoid spider" camp, an Ettercap is actually a fairly unthreatening looking creature, if you can get past its beady black eyes, claws, and face prongs. It's capable of spinning webs from its abdomen, entrapping and consuming any adventurers foolish enough to wander into its lair.
One of the most widespread creatures on this list, Ettercaps can be found in the wilds all over the Forgotten Realms. Any adventure that takes players through a forest could lead to an Ettercap ambush, foreshadowed by an unnatural gloom, giant insects, and suspicious webs.
10 Stirge
A Stirge is a horrifying cross between a bat and a mosquito. Like a mosquito, a Stirge survives off the blood of other living creatures. While it's still a tiny monster by Dungeons and Dragons standards, it would be a massive pest in the real world. Not to mention, they can also travel in packs, each one latching on to a vulnerable part of another monster as they drink their fill. That being said, they only have 2 hit points, which is probably about as much damage as an electric flyswatter does.
Stirges can be found in a wide range of habitats, from caves to marshes, the Feywild to the Underdark. Probably one of the most numerous creatures that doesn't have a special swarm rule in D&D 5e's Monster Manual, DMs should make sure that their Stirges come in huge groups.
9 Roper
Stalagmite? Stalactite? Who cares, when an innocent-looking rock formation may actually turn out to be a flesh-eating monster. A Roper will eat anything that wanders too close to it, often attacking quickly and surprising its prey. It has one big, unsettling eye, that snaps open just before it begins devouring its catch. All in all, it looks suspiciously similar to a squid made out of rocks, though the only thing that could make it more unsettling would be the ability to shoot ink as a defense mechanism.
Another denizen of the Underdark, ropers make their home in any cavern that has stalagmites or stalactites. Hidden in plain sight, they'll wait until unwary adventures come within reach before snatching them up with their sticky tentacles.
8 Yochlol
A Yochlol looks just about as weird as its name sounds, at least in its true form. The creature is described as "a tower of yellow slime with a single malevolent eye" in the Monster Manual, which is about as accurate of a description as it's possible to get. The monster is also able to take the form of a female drow or a spider to conceal its true form, but its touch is pretty much always venomous.
Yochlols are demons, but their position as Handmaidens of the Drow goddess Lolth mean that they often infiltrate dark elf societies in the Underdark. Because of this, players can either encounter them working schemes among the Drow, or in Lolth's home of the Demonweb Pits.
7 Behir
A Behir is a twisted monstrosity resembling a centipede and a crocodile. If that in itself isn't the stuff of nightmares, it's also able to shoot lightning breath. Plus, it can clamber up walls, so there's no telling when one is going to leap down on a brave adventurer to turn them into lunch. Behirs were created by Storm Giants to fight dragons, and they certainly look terrifying enough to put up a good fight against one.
Behirs are solitary creatures, and prefer to make their homes in warm, hilly regions. Building their dens in caves and hidden thickets, they hunt warm-blooded beasts for food. This is a great way to introduce Behirs into a campaign, with a farmer hiring the players to discover what's eating their livestock.
6 Modron
Modrons are curious little creatures. Their society values law and order above all else, with a strict hierarchy in place. A Modron will only communicate with another Modron immediately above or below it in the hierarchy, with no sense of self - except for fulfilling their duties within the society. In a way, it's the perfect fit for their cog-like look, which makes them one of the more unique creatures in the D&D mythos.
Modrons are a strange monster-type to fit into a campaign, as they are rarely seen outside their home in the Outer Planes. If found in Faerun they may have been summoned by a Lawful Cleric, or have been sent there to complete some seemingly meaningless task.