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I need some swamp monsters (Patreon)

Published:
2024-09-12 14:39:33
Imported:
2026-06

Content

On the fourth floor, disease and disadvantageous terrain is the name of the game, but we need some 4th Floor monsters.So far we have:relic worm - relic-eating worm swarmswamp witch -swamp witchManekan burrowers-insects that burrow into fleshBloodsucker - giant mosquitoAdder - snekDiseased Lumberer - Shambling Mound+diseaseDreamcatcher Vine- puts Climbers to sleep, they get killed and it feeds on the carrionAny more?Lots of disease, poison and blood drain, so we may get some items that are related.

Comments

ImYou

Crocodile

Qwerty

Deez nuts

Elvis Malkic

Will of wisps are common in swamps, basilisks, hydras, aligators, slimes might be an option as well

BIGLARGEFISH

Rotcodile breaths poison/diseased breath and is generally like a rotten crocodile

ImYou

Anacondas, jaguars and maybe some type of bird kinda like the amazons

That Guy

A monster that lives under the swamp water and releases gases to create the will o wisp effect we have in reality to lure people in them it eats them like a fly trap

Ethan

Swamp troll. Looks like a patch of dry land in the middle of some swampy water. Is actually a troll.

David Schleimer

Log-o-dile. Basically an alligator / Crocodile like beast that camouflages itself as those maybe-rotten logs will uses to make a path.

garlic

Walking tree

CommodoreCaptain

Giant turtles! The backs of their shells turn into swamp islands.

Ford-Thomas Frank Loveland

Any of those smelly rafflesia plants could be turned into monsters. Give them a charm ability and maybe a symbiotic nature with some nearby monster or make them mobile/dangerous themselves

Kenny

Isn't a Hydra the quintessential swamp boss? - Mud elementals? Suck people in and smother them - Giant toads - Probably birds of some kind to feast on the giant insects - Some creepy aquatic spider things? - Living carnivorous mangrove trees

Krosh

Slimes seem a bit too basic. I want to see a sludge. A monster made out of living mud and mold. Tries to grapple and suffocate you.

Garik Amirkhanyan

Mind controlling fungus that make Climbers paranoid about mind control and eager to share said paranoia(how it spreads: lung-lung). Then after week or two Climber drops dead and produce edible mushrooms(someone tried them)

In-Game_Name

Water elemental- pretends to be swamp water until something steps in them, then pulls them into itself and drowns them to death. Fungal puppeteers - fungus that grows through the corpses of humanoids and manipulates the bodies to draw in other humans and attempt to infect them Centileech - leechs crossed with centipedes

Ed Je

Swamp antlion

Ford-Thomas Frank Loveland

THE ROT, maybe some skeletons or corpses piloted by mold and fungi as they slowly consume the meat

GrandSageGand

Fungus zombies/skeletons, mycelium threads puppeteering corpses, maybe they don't need to be dead, camp in the wrong spot, don't do some kind of odd food prep(suger the meat), and you get infected

Domy

Bogg snatcher. Underwater lizard that lurks beneath the water’s surface, then jumps on top of the climber and tries to drown them. The dirtier the water the better.

Solopath

Venus fly trap monsters. It's a small island with a ring of Venus fly traps close to the edge that eat flies and keep the center area relatively clear of insects. But the whole island is actually a pitcher plant type trap that collapses after the adventurers have spent a bit of time, trapping them in a pit filled with mild acid and slippery slopes.

Dash of Salt

Was about to say this as Fen Lurker, one as either a crocodile or anaconda that mimics a log and drags climbers down while crushing them to death.

JhanicManifold

Sentient giant spiders? For some Mother-Of-Learning homage? And some opportunity for weird consumables

Thomas

Hags, Naga, and carnivorous plants. Hopefully the plants will have psychic skills to draw in prey and pollen to poison and kill them with hallucinations.

Dash of Salt

Big sundew plants hold climbers in place, symbiotic with other monsters that strike when the climber is stuck. Possibly invisible, or attractive in some way, maybe mimicking some sort of valuable natural resource. Plague crows, small swarms of black birds with plague doctor mask like faces and razor sharp wings that cause some sort of blood poisoning, or anticoagulant effect. They strike, inflict the poison and then circle out of range, waiting for climbers to succumb or sleep. Bonus points if anticoagulant the seeping blood attracts other monsters. Fetid water elemental, water elemental but narsty. Quicksand elemental that drags you down instead of passively sinking, especially if it cultivates living grass and other plants on its surface to appear as more stable ground.

Joshua Gunty

My first thought was crocodile adjacent monster and I think this covers that.

Dash of Salt

Piranhas are a classic, you could combine them with flying fish, so they pop out, of a pool on one side of the path, jump in a swarm and take a few bites and then rinse and repeat in a running battle swarm fight. Could carry the water with them as the jump too, swarms able to collectively manipulate water to either pass through a group and nibble, or engulf someone isolated, devouring and drowning them at the same time.

Esch

I wish Will and the gang to find a Capybara, but instead of It being a chill being It should be one of the Apex Predators of the fourth floor.

Scott

Something horrendously disgusting, slimy, an afront to nature. But it's meat is ridiculously delicious and other parts are useful as well. A delicacy beyond anything that can be had before floor 8. Can not be deliberately hunted due to it's ability to sense intent combined with the local terrain.

Crispined Glover Potato Snacks

Yowie: Aboriginal Aussie cryptid. basically an ape or baboon but covered in swamp moss instead of fur. Phasend: Log sized stick bug. Name is a pun for Phasmid with mid replaced for end. Pollywarg: Small dog sized tadpole that attacks in swarms. Name is a pun of pollywog & warg.

AarronConLeche

Tooth-drakes (toothache): tiny, fly-like wyrms that burrow into gums and lay eggs. When the eggs hatch, the maggot-esque hatchlings eat/decay the host's teeth for the calcium to form their carapace. Fester Toads: dog-sized toads with insect eyes that let out a sonic croak attack that deals a tiny amount of damage and also causes necrosis of the brain, albeit slowly. First symptom is black liquid trickling from nose. Sphacelating Pus-Ooze: an off-white slime that can be a vector for literally any mundane disease. They're dangerous because you don't know what they might be carrying. It could be the common cold, it could be flesh-eating bacteria, or it could be ebola/Lyme/measles/chickenpox/cholera - it's impossible to tell just based on sight. They typically don't grow larger than 5-10 feet across and prefer banks around swamps.

Red Viking

Creeping moss - plant monster that looks like any other scum, moss, or plant debris, but once stepped on/in it attaches itself to its victim before rapidly growing to cover and restrain it. It's hellish to get off, as any piece ripped off attaches itself to whatever did so. Its mode of killing is by releasing bacteria that cause necrosis, feeding off the liquidizing flesh of its victim.

DrFumbles

Crocodile / alligator (not sure of the differences / which would be in a swamp)

Leobardis

I was gonna suggest something cordeceps-alike, but this Mind-control paranoia fungus angle is even better.

AI Doomer Pop (e/ak)

Some baseline things outside of the typical westerner view of "damn bugs": You're in a swamp where everyone gets rot lung. A lot of lung disorders like that are caused by things like tapeworms and the like, come in through a person's feet, make their way to a person's lungs, lay eggs. Australia has paralysis ticks. If you pull the body out the head can still pump in enough neurotoxin to paralyze you (and removing the body can cause them to dump the entire dose all at once). If you've ever used an outhouse in the outback, cane toads will often sit inside them for warmth, and guess what is warmer than the shit on the bottom? This can be a rude surprise. If you go walking along the Xingu river in the amazon, you're as like as not to step on a stingray, and even if they just lightly flap their tail in your direction, you're going to get barbed. Sure, the barb is venomous and will cause you a couple of days worth of pain, but the real factor out there is that in the nasty muddy water and jungle environment that kind of barbed bit of cartilage is going to tear up your flesh in such a way it is almost sure to get infected. Piranha. Electric eels live in the amazon basin and lurk in muddy bottoms. Both are probably a bit overdone/typecast. Swamps usually don't just form outside of system shenanigans. You usually have some kind of meandering river, which peels off ox-bow lakes, which then accumulate detritus and form swamps and bogs and the like. That might give some kind of structure to the land. All of this is overthought, but hey.

Connor Kelly

Maybe a sub boss similar Nurgle's Rot beasts. Living plaguewalkers, Similar to the swamp witch voodoo curses and have the next kidnappers use curse heavy attacks, pretty much anything that serves Nurgle Fantasy or 40k.

TheLost

Sentiant toxic cloud

NorkNork

Nutria. They're like water rats. Think capybara except mean and ugly.

Michael

Vampyre Alligator: A croc that can suck the blood through its teeth when it bites you. Does deathrolls as well to further compound the grapple and disorient from blood loss. Has a soft flame aura around it to cause light burns and keep bugs off, making 1st degree burns on contact and further enhancing its grappling capability.

Sebin Paul

How about corpse flower? Carnivorous plant growing out of or near the corpses of dead adventurers? Maybe using their gear as a lure.

Michael

Sturgeon with scalpel like fins that cut apart flesh easily.

AI Doomer Pop (e/ak)

First time I saw a flying fish, my wife and I thought someone had thrown a weird frisbee out into the water. It had been seeking shelter from a nearby dorado. That said, they move _fast_ and evolved because they had to get out of the water to escape dorado, and stay low to avoid frigatebirds and the like. Not sure how well they physically would work in a swamp-like environment where they are as like as not to land on er.. land. The result seems likely to be more magikarp than anything. ;)

Michael

Creatures living in a swamp need a way to deal with the various insects found within

Michael

Archer fish that shoots water to ‘snipe’ climbers, said water is laced with bacteria similar to a Komodo dragon bite. Intentionally shoots for eyes/mouths to get people sick and then follows them until they die

Akkido

Cordyceps Skeleton! Fungus controlled bodies remains.

Hollowlce

Sea cucumber and geoducks as they both look disgusting and would fit a swamp theme if you made them swamp variants, also leeches as everyone hates them but they are worms so loth would love them. Cactus wasps that fire poisoned barbs. Mandrakes.

Jackson Andrews

BOG OSTRICH, big long legged bird that looks like a crane and an ostrich had an evil baby. I thinking Gorm, looking thing, but instead of 4d murder, it’s skinny, covered in moss and mud, and stalks you slowly before running in and trying to steal your squishy archer.

Hazior

crocs are a classic ambush predator. Spiders are pretty common as well since they prey on the mosquitos. Could have a moss or something vampiric since that fits the theme of most moss. Crawfish/crabs would probably be common. Angry birds that can swallow you whole or something like pelicans. Might make a nice boss mob.

Courier

not a monster but poisonous plants, something like a super poison ivy/oak/sumac. Plants that just don't like the idea of you being around

Sijay4

Corpse Toad: a big Toad that attaches the corpses of its victims to its body like armor with a hardening mucus. Solitary in nature, these creatures bait climbers with the freshest corpse they have, making it float on the waters surface holding it in place with their tongue. They have a massive croak they use to disorient their prey and either use the bait corpse as a flail or quickly grab a climber with their tongue and suburge under the water to drown them. Could have them expel a toxic miasma they use the corpses as fuel for as well

austin kutz

You need yourself a tentacle monster.

austin kutz

But somehow taste really good to Will

Leeland

Bog Turtle is a classic. Huge turtle that can camouflage as a small hill.

Dax

Combine with Swamp Witch and a cottage and you have discount Baba Yaga

Joel Magnuson

3 part critter/fungus (insert horrific name) Part 1 bad rash or mold non-fatal so newcomers are not worried but long timers know that if left alone long enough becomes. Part 2 infested corpse/area I'm thinking tentacles and thorns to ensnare and add to mass until Part 3 becomes wandering tentacle horror kind of eldrichy shambling mound. Weak to electricity and ice AOEs, cutting damage. Strong against piercing, crushing, fire.

AarronConLeche

Maybe the ooze can symbiotically infest your shambling mound and make it even deadlier because of the added diseases it provides? A merged monster? Idk

Daemion

Water spiders that run extremely fast on top of the water surface. Solitary but can kill a human with just a few bites. Sloths hidden in the trees. Overgrown with moss. They drain people's energy if you stay too close for too long. Mushrooms that burst apart when you get too close, spraying you with a noxious digestive acid. Perhaps partnered with another monster that lures people in. Like for example some sort of glow bug or sprite. Looks cute and nice but leads people astray.

Dax

Swamp Elementals - Subspecies of Water Elemental Awakened Disease - sentient (but not sapient?) disease Corrosive Algae - consumes on contact, immediate explosive growth covering touched creature. corroding all the while Gator Hulk - A Gator, but meaner and with bigger muscles Rot Ent - Bog Trees that germinated cranky and their mood deteriorated from there.

Thomas Issa

Swamp Hag > swamp witch In covens of 3

person1357

Rot slime Hides in the water waiting for someone to step in them

Nicholas Gracia

Serrated Maws - bipedal Crocodiles or Alligators (whichever are naturally in the swamp) that cause a bleed effect and so allow for the spread of disease - allow for easy fodder- or be pack animals- could also have their saliva give a disease

Thomas Issa

Undead known as the drowned

Fleisch

Mound Devil - A small worm that eats the ground but leaves poisonous dirt in its wake. Nothing can grow on this ground and the poison seeps through skin. What does the poison do? Well, we’ll have to read to find out.

Thomas Issa

A type of heron or Egret with elongating beaks it uses to impale

Matt

Thorn Assassin Dryad; A blood drinking bramble patch with an incredibly stealthy thorn whip wielding assassin who tries to whip around prey's neck and drink their blood through their whip. The thorn assassin dryad is incredibly difficult to destroy in conventional ways (regeneration), the easiest way to defeat is to burn the briar patch. It's very flammable despite the water environs. It smells vaguely volatile. Lighting fires in the swamp is difficult due to most non magical fire starting sources being wet, but if you can do so this will violently ignite. If you can spot the dryad (easiest to do when you spot your friends having their blood drinked and being potentially partially decapitated by a whip) the coloration matches the associated Bramble patch. The assassin is not flammable.

Fleisch

Trelimp - A living tree that always has an obvious limp. It hates animals that walk on two legs because its jealous. It’ll attempt to smoosh any bipedal animal with its legs.

Deinos

How about the body-knocker, he tries to burrow into any open orifice to lay his eggs. He looks like an undulating worm. Any associations with other things are purely coincidental.

Thomas Issa

Giant Crocodiles with ambush death roll powers and plover birds that rid them of parasites

Fleisch

Lefblow - A tree whose leaves give off a toxic gas that attracts any animal. The said animal wants to eat its poisonous bark. This poisonous bark makes the animal unable to move because they want to be by the tree. Thus they die and the tree gets sustenance.

Ichikira

What about something like an angler fish with a minor taunt ability linked to their lantern light. The males are pretty harmless and basically just float at the surface of the water using their lantern to attract bugs to eat. Most of the time they're an easy meal for climbers or an effective living "bug zapper" that helps clear an area of bugs. But! Maybe a third of the time, there's a female joined to the male just below the surface (imagine that after mating the male becomes the female's lantern). They're giant, aggressive, have very sharp teeth, and they're capable of both applying a charm effect to the male, making them an effective lure for climbers interested in the benefits the male provides, AND greatly amplifying the males taunt effect, directing all incoming attacks to it's mate and using them as a shield.

Fleisch

Cheech - A leech that feeds off humans charge. They are attracted to mages or other players who have a lot of charge. Could change the name to Bane of Mages or Mage Killer or Focal Worm/Leech.

Glegori

Going with the theme of everything rotting and sucking. Crocodile with a rotting mouth that makes wounds get even more infected similar to how seals have rotting mouths. Also it's flesh is poisonous and inedible because FK you that's why. Could also make it so that someone with chef powers can make it edible and this is the point where climbers have to start putting together that supply train

Vinohr

A hippo that buries itself into mud with its jaws spread wide, looking for all intents like mud. When something steps on them the jaws snap shut with crushing force. Like a big angry bear trap that can run at 40mph

Matt

If you want to be mean, increase the amount of distance the dryad can travel from the bush, have a coven of them who sometimes share kills and have an alliance all located in the same general area. Put space between the thorn briars so they don't all catch at the same time, and make the smoke from them burning a hallucinogen so that the party stumbles into more dryads after they take care of one of them and are under the hallucinogenic effect.

Vinohr

Would also love just an ordinary platypus

Heedless

You can't have a swamp without gators.

Courier

stomps into town eating an entire bush of the worst thing you can imagine

bradyman50

I'm seeing lots of cool, and completely evil monster ideas, but thinking about what niche would be left open, all I can think of is some sort of dry land mimic, maybe a gator or turtle, maybe a literal mimic or slime, that is completely undetectable and appears as a bit of safe ground to all abilities, until it attacks

A

Something like the mythical Strix would be cool - avicious blood-drinking / flesh-eating owl that inflicts curses and debuffs.

Exrotes

Clearwater Slime: Big moving patch of seemingly clear water moving through the dense swamp eating any plant and animal life that comes in contact.

Ryan Berends

When I think of diseases I think undead. Undead corpse waiting to explode when you’re right above it.

Cuban Pete

(Windchime) Weeping willow/mangrove tree that grab, strangle, and slowly absorb nutrients till all that is left is bones swaying in the breeze

Exrotes

False Island: Big carnivorous plant that looks and acts like solid ground until something heavy enough stands on it and falls through and into the root system below. Like a carnivorous version of the irl False Islands.

A

Also a super-charged version of the zombie fungus cordyceps, but instead of being anything like the Last of Us and creating human zombies, it literally only affects insects. That would be hell for Loth to deal with and could be something that isn’t really mentioned by other Climbers since to tang one without insect Minions it wouldn’t seem any different than any other swarms of insects.

John

Infested Lumberer - A variant of the diseased lumberer but it's body is filled with hives for different bugs. Basically works as a big spawner that keeps sending out waves of smaller bugs until you kill it. And when it dies it explodes into a giant swarm that attacks everything nearby at random.

John

Or just the Leech Monger from Demon Souls. So a humanoid figure made up of thousands of leeches with a hive mind

Summers Mori

Stillvine boa. Giant snakes that camafloge themselves as vines before attacking.

Lazy Giant

A symbiotic relationship between flies and a crocodile. Flies debuff you with loss of sound and smell. The crocodile has camo. XD

Chris Gast

Heart Worms - Hatching from eggs laid in tainted water or food, these tiny red and black worms infest people and cause their emotions to go wild, particularly tending toward rage or confusion. Phase Alligators - in addition to hiding in the mud and water, they also displace themselves slightly outside of space. When they do their death roll after grabbing someone, it is wildly disorienting for their victim, as they flop in and out of reality. Stand Spiders - House sized frilly daddy long-legs spiders, that stand perfectly still while hunting, appearing to be a small stand of trees unless you carefully look up and realize that all the trunks connect to a main body that looks like a Ghillie Suit with eyes. Mud Frogs - Frogs that appear to be made out of squishy mud. They can swallow prey larger than their body because they are not solid, becoming a coating of mud on the creature they swallowed, but retaining two frog eyes sticking out. If they are in danger, they simply collapse back to frog shape and try to hop away.

Sobek

Some type of Trent like in Lord of the rings

Bio5631

Luring/spiked snapper - a giant snapping turtle that shoots spikes or lures prey in with an illusion enhanced tongue

Bio5631

Vacuum mouth - a catfish that uses space and gravity magic to suck everything towards it.

gray matter

Was checking to make sure gators were mentioned

Benjamin Collins

Some kinda croc, giant snake, spiders, turtles, giant wasp hive maybe, locnas monster, swamps seem like a good area for wyvern or something like it

ArchonUmbra

Lesser Flood Wyrm - distant cousin of true water dragons. This wingless, legless Wyrm resembles an amphibian serpent. Said to cause the only fast-moving water on the floor. Any River or whirlpool is supposedly the domain of these floor bosses. Frequently floods stretches of the floor and occasionally requires whole cities to shift to safer landmasses.

Thomas Issa

Children of hags don’t know what to call them, each one in a coven of 3 each give birth to triplets at the same time Also have hags require being in a coven of three to best amplify their powers so if a member/s of their trio dies they look for other broken covens

SV

Maybe some of the following mythological creatures or something inspired by them: Kelpie, kappa, Nuckelavee, nixie. Spirits and creatures associated with water and drown people.

Paul Rauner

Fungal hive-mind creatures seem like a solid swamp, disease, undead opportunity. Maybe a mini-boss type that runs fungal undead as minions to drag back biomatter to add to the feed pile

Jimmy Oneil

Greater heron- heron type bird that preys on the lesser creatures of the swamp. Semi intelligent is known to stalk climbers

Dash of Salt

I hear ya, that’s one of the reasons why I was suggesting instead of flying out of the water they carry a big bubble of water with them and then engulf and drown/devour people

gray matter

Lots of evil super hard monsters being created for only the 4th level. I’m sure there will be more swamp levels tho. I haven’t read all of the comments but an ooze monster of some kind. Just a gelatinous hard to kill hard to notice as first and absorbs things. Also a walking monster made of vines maybe.

CMA27

Kappa from Japanese mythology?

Jeff Gaebler

Hmm a swamp...I know Cajun people! Lol jk

Cyrus McEnnis

Red-Neck Treants Swamp Chickens (pukeko) Shrieking Eels Will-Oh-Wisps Swamp Dagon Vines that create swamp zombies - they just _look_ like corpses but they're actually being puppeted by vines Ants large enough for Loth to ride Crocotaurs - either / or Mino or Cen variants Dung Kobolds Mermen (of the Fiji variety) Animated Banjos Baba Yaga's Shantytown Angler Fish variants Mud Golems Nomlins (primary food-source) Rust Monsters (to get what the Relic Worms leave behind) Mildew Monsters (To get what the Rust Monsters leave behind) Ingredients for Health Potions (to make the floor hated but necessary)

Gaunt

Hagfishfolk

Fleisch

Pit Worm - A worm that attempts to lay its eggs into the armpit hairs of other animals.

Fleisch

WindSky Spider - Very small spiders that move with the winds and connect with each other to make a wavelike structure in the air.

Fleisch

Phantom Spring - Those who have entered the murky water have never returned. This is because there exists a phantom species in the water that can only be seen by people like Alicia or others with Phantom abilities.

Fleisch

Dragon Eel - An eel that has a breathe ability. This ability could be poison, water, slime, debuff, etc. The eel has dragon-like scales which are strong and maybe could be used as a sacrifice that Will sends back down to the orphanage.

Fleisch

Franks Waterbug - a waterbug that a famous Climber by the name of Frank found and made a highly addictive drug out of.

Fleisch

Shergan Beperd - A dog familiar Will sees while strolling in the stronghold.

Fleisch

Metal Links - a type of mosquito that eats metal.

Alexis Lionel

Alligators, you don't need to fantasy them up. Just Alligators. Okay maybe a little fantasy, like maybe their jaws are a bit like William's hand? Phantom jaws that can bite down in an area around them. Not a big area, but still has the full force of their jaws when it bites down. And if what they bite is ripped off a target, it enters their mouth. Swamps gotta have gators, like... It's tradition. Swamp puppies.

Pseudo

sirens!

Daxo Lune

Oasis Pool - A small body of fresh water without bugs or other monsters that is actually the mouth and saliva/nectar of a trap plant or ambush predator. Alligator - fast and numerous

A

“Dhampir” (pun intended) that are basically just clawed vampires but with the mouth of a leech instead of a human mouth with fangs.

Cyrus McEnnis

Health potion addicted sirens with no teeth. They realize Will is potentially an unlimited source of drugs and try to kidnap him and put him to work with Sourdough to supply their habit.

Blizzzr

I'm not seeing enough frogs! poisonous/venomous frogs!

M.J. Markgraf

Ohh! I used a creature in my first story. It was a hive of insects that turned the husks of bodies into moving hives :)

Mani

Big ol' toads

Melody Haren Anderson

Maybe some sort of parasitic worm that replaces part of a climbers organs, but also makes them stronger, in return for needing to feed the worms in... unsavory ways that also make more that can spread to other floors.

Scistra

Shailer: Segmented insectoid creature whose limbs blend in with reeds and vines. Ambush/stalking tactics. Prefers to capture and drown its prey?

Joe ?

A funky looking mushroom that launches ethereal spores, if they touch you they go completely through you with seemingly no effect. But as time goes by you can't help thinking about it more and more. What the heck was that, why does that creepy mushroom launch ghostly spores that pass through your skin, and you can't get the image of the mushroom out of your head, it looked so weird what the hell was up with that. I gotta get up higher so I don't encounter anymore of those weird things. Then when you're panicked and as high as you can go and you're too paranoid about mushrooms to think of anything else, the mushroom sprouts from your thoughts themselves exactly as you were imagining it, and it shoots out spores from high up to spread as much as possible.

MurkyTruths

Fingers Fish: catfish with fingers instead of whiskers. Are good at making traps with reeds and muk from rivers. Also the fingers are kinda tasty when fried.

MurkyTruths

Also there's a method to catch catfish irl where you stick your fingers in a hole underwater and wiggle them like worms to entice a big catfish to bite your hand.

Toknightly

Swarms of blood slimes. Slimes made of blood that hunt prey by getting inside of them. Natural predator of unsuspecting blood suckers

DM

Gas geist. Semi physical cloud of horrible swamp smell. Disables via coughing and retching. Feasts on corpses to make more cloudy swarms. Often mistaken by new Climbers for ghosts to their regret - in fact it’s a living cloud of particles.

Got Heem 11

A random encounter with a coonass climber would be funny

Jeff Gaebler

It's like they are speaking but no one can understand them....such a weird monster these Cajun are

Got Heem 11

Some kind of super fog monster, irl when fires occur in the swamp it can cause a super fog with no visibility. Not to be confused with smog. Although a smog monster with a disease debuff would work too.

Got Heem 11

He/she has a pet bayou bengal

Need More Hugs

How about carnivorous seaweed that grabs onto people to drown them and then feed on the carrion? Or if it needs to be a monster it could be a type of swarm like a collection of algae?

Clayton Azevedo

Muck/living mud monster that strangle and suffocate. Mocking birds that use teammates voices to harass/forehadow enemies. Massive Crawfish. Willow wisps that craft ghostly illusions.

True_Reaper

Mycelial Overmind A large, intelligent fungal colony that infects creatures with spores, consumes them, and reanimates their bodies as Fungal Thralls. The Overmind controls the thralls through a mycelial network and spreads its influence through terrain-altering abilities like entangling vines and toxic spores. As it consumes more hosts, it regenerates and grows stronger, making the dungeon floor a hostile, living ecosystem.

Exrotes

Everyone seems to be thinking the standard gross swamp nasties but here's a twist, did you know Flamingos live in the Everglades. Giant pink birds who's thick rough skinned standing on one foot stance can be confused for tree trunks.

Jack

Big green ogres

Aguy

Literal actual cordyceps Predatory mushrooms that emit psychelic spores that put effected creatures into a state of absolute euphoria, sending them into a psychedelic coma that let's them be consumed at a medium pace Sentient Alligator's, all of whom are extremely interested in stock market speculation (They're all mushroom infested and tripping collective balls) Slimes, the bad kind, the sentient ones acting with complete malice to all things, infested and lovingly drizzled with bubbling insect viscera and hides creatures that have rather died in any other way, the kind that search for unusual species of mushroom, disease, venom, and poison to incorporate just to make you die that much worse. Floating Death Mound, ok so imagine your walking in the swamps you put your foot down on something hard, feeling sure of your step you put your weight on it and as a halfway through your next step you feel your is coated by half-fleshed digits. The next thing you know is you've underwater and are staring at mound of digits, skulls, spines, worms, viscera, and plant matter a living death that you will soon be part of.

Fleisch

Maybe thats what those, demon replacing humans are?

David Weller

Let's expand this to giant flamingos that swamp witches live on... ok, it's a twist on Baba Yega.

David Weller

So... hear me out. I'm thinking sentient scarecrows. If you ever played League of Legends, watch the Fiddlesticks movie and that's what I'm picturing in my head. It's a forest instead of a swamp, but I'm thinking the 4th floor is always overcast and it's usually dark. So add knee deep water that the scarecrows are standing in, and that's my vision.

gabriel hutcherson

inbred stragglers/swamp mutant/swamp hunter. humanoid monstrosity with mold and boil covered skin that when burst let out spores or mayflies. and they can operate boats and have cages with zombie gators.

Ryan Bimson

Punji Piranha. Lay still, partially burrowed into mud in shallow swamp water with spikey fins sticking up, hidden by the water. When someone/something steps on it, fishy blood frenzy.