Whether you’re hosting Dungeons & Dragons or any other tabletop RPG, players love excitement and surprise. It’s one of the things that often keeps them hooked and coming back session after session.
Whether it’s a dramatic showdown with a big villain or a chaotic moment of spontaneity when an unexpected foe enters the battlefield, it’s moments like this that keep the game fresh.
However, if you’ve spent any real time behind the DM screen, you know that keeping things interesting is often easier said than done.
Fortunately, one of the easiest (and even fun) ways to liven up your next encounter is to go digging for weird, strange, and downright uncommon monsters.
We’re talking creatures that not only challenge your players mechanically but also mess with their expectations, trust, and even their sense of reality (if you’re lucky!).
Sound like fun? Well, here are five of the most underrated monsters that deserve way more table time in your next encounter.
1 – The Intellect Devourer
Source: https://eberron.fandom.com/wiki/Intellect_devourer
At first glance, the Intellect Devourer doesn’t look like much more than a weird dog brain thing.
It’s small, bizarre, and kind of fragile. A lot of DMs skim past it, thinking it’s just a typical low-level aberration, or just too strange to fit into anything serious.
But the strangeness is the appeal, and the truth is that this thing is not meant to win fights the traditional way. It’s mainly meant to replace people and mess with your players (which is great in a horror campaign).
You see, the Intellect Devourer has the ability to consume a creature’s brain and take control of its body, making it one of the most unsettling mechanics in the game.
One of the main reasons many DMs skip it is because it requires a bit more finesse. You can’t just drop it into a dungeon and expect it to shine the way some other terrible creature would.
It works best when it’s part of a larger narrative, such as one that involves infiltration, paranoia, and slow-burn horror – or as a one-night scenario focusing on weird happenings.
Mechanically, it’s fascinating because overall goal is not about damage output but positioning, surprise, and psychological pressure – shifting the way players typically expect combat.
Scenario idea
Think about a recently rescued NPC that returns shaken but alive, insisting they barely remember what happened. Maybe one of the party had to be rescued from a dungeon.
At first, nothing seems too unusual.
But then small inconsistencies start to surface, such as odd pauses in conversation, knowledge they shouldn’t have, and a strange lack of emotion when encountering things that should move them (the corpse of a friend, a frightening moment, etc.).
And what about if you’re travelling with a group, and each night one person disappears or ends up murdered? The mystery almost sets itself in motion.
Just think of John Carpenter’s The Thing for Inspiration.
And for the biggest surprise, consider that it may not be the only one!
2 – The Froghemoth
Source: https://forgottenrealms.fandom.com/wiki/Froghemoth
The Froghemoth is one of those monsters that feels like it wandered in from a completely different genre, which makes it kinda unique in most scenarios.
It’s big, bizarre, and a little ridiculous on paper. Most people describe it as a giant, tentacled amphibian lurking in a swamp, which doesn’t scream serious threat or just too awkward. Thus, many DMs pass it over in favor of more traditional beasts or humanoid enemies.
What makes the Froghemoth shine is how chaotic it is in combat. Considering its tentacle attacks, grappling potential, and ability to swallow creatures whole, it can transform a standard encounter into pure mayhem.
On its home turf, players will be scrambling to avoid getting dragged underwater or yanked into its maw.
Scary stuff.
(Plus, I mean, who wouldn’t want to fight something called a froghemoth? Enough said…)
Scenario Idea
Picture this: a swamp that swallows sound and light alike, the scenery broken up only by scattered remnants of a missing caravan, the party finally located.
There we have half-sunken wagons, torn fabric, and long drag marks vanishing into dark water.
Seems peaceful at first, but what could have caused all this mayhem?
The surface stays still for just a moment, then it shifts.
Whatever took the caravan is still here, waiting beneath the murk. And then, chaos, as the frog monster appears.
Oh, and feel free to call it a frog monster just to mess with them.
3 – The Banshee
Source: https://forgottenrealms.fandom.com/wiki/Banshee?file=Banshee-5e.jpg
Now, now, I know what you’re thinking.
Banshees aren’t that exotic, right?
Well, how many campaigns have you played where you saw even one?
The Banshee often gets overlooked because it doesn’t look as intimidating as other monsters or seems too horror cliché.
Sure, it does not have the hulking frame, massive weapon, or the obvious brute strength or bigger enemies either, the kind that usually swallow up hits and keep going.
But what most people forget is that the Banshee is less about physical threat and more about atmosphere.
Its mere presence brings tragedy, history, and emotion into an encounter, which is something a lot of combat-focused monsters lack.
Plus, it has a Wail that can drop multiple characters to zero in an instant if they’re not prepared.
DMs tend to skip it because it can feel swingy. That Wail can either be devastating or barely matter, depending on the dice. But when used thoughtfully, it creates tension like few other creatures can.
Mechanically, it forces players to think differently because charging in blindly is risky. Preparation, positioning, and even diplomacy play an important role here.
Scenario Idea
Let’s set the scene at an abandoned manor, the kind that stands untouched by time, its halls heavy with silence and grief. The perfect horror scenario.
There’s hints of a tragic backstory as players spot ruined portraits of a proud family, a couple in love, and their lost letters, maybe even a wedding gown, and hints of betrayal.
Of course, banshees never have happy endings. They spell out how what could have been a lovely life went wrong, and a sorrowful presence stirs in the area.
But don’t forget to give a reason for why your players go there and they need to retrieve something, maybe from the wedding chapel.
A broach or family heirloom the descendants require, only it’s guarded by the wandering banshee, whose scream is heard in the distance.
How will they cross it and nullify the threat of her wail?
4 – The Quickling
Source: https://forgottenrealms.fandom.com/wiki/Quickling
If you want to completely break your party’s usual combat rhythm, the Quickling is your best friend.
This tiny fey creature is incredibly fast, making it almost impossible to pin down.
The Quickling turns combat into chaos. It darts in, strikes, and vanishes before anyone can react properly. This makes it hard for players to rely on their usual tactics in combat.
As a result, it forces your players to think about things like setting up defenses, traps, controlling their area, and prediction instead of just swinging weapons.
Mechanically, it’s a masterclass in disruption, although it doesn’t overpower the party, but forces them to fight being outmaneuvered.
Scenario Idea
Deep within a quiet forest, something unseen begins to toy with travelers.
A pouch goes missing. Then a roasting rabbit right off the spit.
A branch snaps. Footsteps echo where no one stood.
By the time anyone reacts, the mischief has already turned dangerous, and whatever is behind it refuses to stay still long enough to be caught.
How does the party prepare and protect themselves from an intruder who appears, strikes, and disappears before they can react?
5 – The Oblex
Source: https://forgottenrealms.fandom.com/wiki/Oblex
The Oblex is one of those monsters that were designed specifically to mess with players’ heads.
It’s a shapeshifting, memory-stealing ooze that can create duplicates of people it has consumed.
Yeah, it does all that.
I mean, you can see how it opens up so many possibilities beyond combat, right?
The reason it’s often skipped is that it requires a bit of planning. You need NPCs, relationships, and a sense of normalcy for it to disrupt stuff properly.
But if you’re willing to set the stage, even just earlier in the night or one session before, it can become one of the most memorable encounters in your campaign.
Mechanically, it has excellent social and combat elements that make it unique from other monsters. The party might not even realize they’re dealing with a monster until it’s too late.
Scenario Idea
Have the party reach a town, get to know it, and then head off to complete a quest.
When they return, activities in a town carry on as if nothing is wrong, yet every interaction feels slightly off.
You can feel the conversations loop, familiar faces lack warmth, and even old allies seem distant.
Except maybe one townsperson, who is convinced something is wrong but no one believes.
Of course, beneath the streets, something is pulling the strings, feeding on memories and sending hollow versions back to the surface.
By the time the truth is uncovered, it may already be too late to tell who’s real.
Think Night of the Body Snatchers for a horror movie inspiration.
Bottom Line
It’s easy to fall back on the same familiar encounters, with goblins, bandits, zombies, and the like.
While it works and is easy to run after a while, there’s a risk your players will start to see it coming. That they will expect sameness and maybe grow tired of it.
But the real fun will always kick in when they don’t.
You’re looking for the moments when the room goes quiet because something feels off, when they stop mid-plan and start questioning each other, or when they realize this is not just another fight they can brute-force their way through like all the ones before.
Of course, it can require a lot of planning, but these moments can also come from the monsters no one thinks of using them.
So, if you’re flipping through the Monster Manual, don’t just stick to the usual picks. Take some time and look for the strange entries that not everybody is used to.
Remember: the most memorable encounters are the ones your players never saw coming.
Looking to run your own campaign and not sure where to begin? Consider checking out our pieces on how to use taverns effectively in your opening nights or how to run a horror scenario effective.
