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Terrain: Marsh
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89 creatures
| Name ▲ | CR | Type | Alignment | Size | Description |
|---|---|---|---|---|---|
| Ahuizotl | 6 | magical beast | NE | Large | This bear-sized beast has a body like a squat simian, a dog’s face, and a long tail that ends in... |
| Annis Hag | 6 | monstrous humanoid | CE | Large | With limbs like gnarled branches and skin like a toad’s, this repulsive, hunchbacked crone... |
| Blightspawn | 5 | aberration | CE | Medium | This human-sized, mosquito-like creature has a long, flexible proboscis that ends in a murderous stinger. |
| Boggard | 2 | humanoid | CE | Medium | |
| Carbuncle | 1 | magical beast | N | Tiny | This small, awkward reptile with a fist-sized gem jutting from between its two bulging eyes... |
| Catoblepas | 12 | magical beast | N | Large | This ugly creature has a boar-like head with short antlers, a thick bullish body covered in... |
| Chuul | 7 | aberration | CE | Large | |
| Constrictor Snake | 2 | animal | N | Medium | |
| Corpse Lotus | 13 | plant | N | Huge | Planted in soil fertilized with corpses, this giant, blood-red flower is surrounded by prickly vines. |
| Crocodile | 2 | animal | N | Large | |
| Dire Crocodile | 9 | animal | N | Gargantuan | |
| Dire Tiger (Smilodon) | 8 | animal | N | Large | |
| Doppelganger | 3 | monstrous humanoid | N | Medium | |
| Dracolisk | 7 | dragon | N | Medium | |
| Emperor Cobra | 5 | animal | N | Large | |
| Faceless Stalker (Ugothol) | 4 | aberration | CE | Medium | |
| Fey Giant Toad | 3 | fey | CN | Large | |
| Flytrap Leshy | 4 | plant | N | Small | |
| Frog Father | 5 | animal | N | Huge | This elephantine amphibian has a grotesquely long tongue and beady eyes. |
| Froghemoth | 13 | aberration | N | Huge | |
| Fungus Leshy | 2 | plant | N | Small | |
| Garden Ooze | 2 | ooze | N | Small | What seems to be a mass of diseased fibers growing on a plant suddenly moves and slithers... |
| Giant Anaconda | 10 | animal | N | Gargantuan | |
| Giant Flytrap | 10 | plant | N | Huge | |
| Giant Frog | 1 | animal | N | Medium | |
| Giant Leech | 2 | vermin | N | Medium | |
| Giant Mosquito | 6 | vermin | N | Medium | |
| Giant Muckdweller | 2 | magical beast | N | Large | |
| Giant Slug | 8 | vermin | N | Huge | |
| Giant Toad | 2 | animal | N | Large | |
| Glaistig | 21 | fey | CN | Medium | A mien of strange, primal beauty surrounds this woman, magnified by the inhuman tone of her skin... |
| Goblin Dog | 1 | animal | N | Medium | |
| Goblin Snake | 1 | aberration | CE | Small | A gray, lipless goblin head with serpent’s fangs sits atop the sinuous black body of this... |
| Goliath Spider | 11 | vermin | N | Colossal | |
| Gray Ooze | 4 | ooze | N | Medium | |
| Gray Render | 8 | magical beast | N | Large | This hulking beast has slick, gray, hairless skin. Its numerous yellow eyes and wide toothy maw... |
| Green Hag | 5 | monstrous humanoid | CE | Medium | |
| Grendel | 19 | monstrous humanoid | CE | Large | This lurching hulk carries no weapons, but its eyes burn with menace, and its long claws are... |
| Grippli | 1/2 | humanoid | N | Small | Its slick skin a mottled pattern of bright colors, this agile, frog-like humanoid carries a bow... |
| Hag Eye Ooze | 3 | ooze | N | Small | A single eye stares unblinking from an amorphous blob. A transparent pseudopod extends from the mass. |
| Harpy | 4 | monstrous humanoid | CE | Medium | |
| Hezrou | 11 | outsider | CE | Large | |
| Hodag | 6 | magical beast | N | Large | Spikes cover the body of this vaguely reptilian creature. Its fearsome face features... |
| Hydra | 4 | magical beast | N | Huge | |
| Iguanodon | 6 | animal | N | Huge | |
| Kawa Akago | 3 | plant | N | Small | This combination of a lily pad and a flytrap is ringed with horrifying fangs and has another... |
| Leech Swarm | 4 | vermin | N | Diminutive | |
| Lizardfolk | 1 | humanoid | N | Medium | |
| Lukwata | 11 | magical beast | N | Huge | A long, spiny fin runs down the length of the dolphinlike body of this eel-headed predator. |
| Manticore | 5 | magical beast | LE | Large | |
| Marsh Giant | 8 | humanoid | CE | Large | |
| Medusa | 7 | monstrous humanoid | LE | Medium | |
| Mist Drake | 5 | dragon | NE | Large | |
| Mobogo | 10 | magical beast | CE | Huge | This grotesque creature looks like a gigantic toad with leathery wings, fangs, horns, and three... |
| Mosquito Swarm | 3 | vermin | N | Diminutive | The droning and spastic movements of this cloud of hungry mosquitoes promise a painful ordeal. |
| Muckdweller | 1/4 | magical beast | N | Small | This bipedal lizard has mottled gray-and-brown flesh. A short dorsal fin runs the length of its... |
| Mudlord | 6 | outsider | N | Medium | This fluid creature’s roughly humanoid form is composed entirely of thick gobbets of soggy, brown mud. |
| Nuckelavee | 9 | fey | NE | Large | This skinless creature resembles a horse and its humanoid rider, fused into a single hideous... |
| Nycar | 2 | dragon | CN | Tiny | This cruel-looking serpent is about the size of a housecat, with two forearms and... |
| Ochre Jelly | 5 | ooze | N | Large | |
| Ophiotaurus | 17 | magical beast | N | Gargantuan | This enormous russet serpent has the head and forequarters of a ruddy bull with bronze horns and hooves. |
| Peluda | 10 | dragon | NE | Large | This long-necked dragon has steamy breath, a lashing tail, and a back covered in hundreds of quills. |
| Plesiosaurus | 2 | animal | N | Large | |
| Poison Frog | 1/2 | animal | N | Tiny | |
| Shambling Mound | 6 | plant | N | Large | |
| Shocker Lizard | 2 | magical beast | N | Small | |
| Slurk | 2 | magical beast | N | Medium | This disgusting beast looks like a slime-covered toad, but with two walrus-like tusks jutting... |
| Spinosaurus | 11 | animal | N | Gargantuan | |
| Spirit Naga | 9 | aberration | CE | Large | |
| Stirge | 1/2 | magical beast | N | Tiny | |
| Swamp Mummy | 4 | undead | LE | Medium | |
| Swan Maiden | 6 | fey | CG | Medium | This tall, regal woman is clad in a long cloak of pristine white swan feathers and silvery armor... |
| Tarn Linnorm | 20 | dragon | CE | Colossal | |
| Tentamort | 4 | aberration | N | Medium | This dark blue creature has a conical body covered in angry red eyes and numerous tentacles, two... |
| Tizheruk | 5 | magical beast | N | Large | This serpentine beast undulates through the water. Its scaly skin and its flesh are clear,... |
| Trumpeter Swan | 1/3 | animal | N | Small | |
| Uintatherium | 7 | animal | N | Large | |
| Urannag | 8 | construct | CE | Huge | What at first appeared to be a sadistic spiked cage writhes into unholy life, extending bladed,... |
| Vampiric Mist | 3 | aberration | NE | Medium | A cloud of crimson vapor reeking of fresh blood hangs in the air, reaching out with lashing claws. |
| Viper Vine | 13 | plant | N | Large | Large tendrils ending in tiny claws unfurl from the central stalk of this plant, which rises... |
| Vodyanoi | 5 | monstrous humanoid | CN | Medium | This humanoid salamander carries a gnarled staff in one hand. Tendrils drape its chin,... |
| Voonith | 4 | magical beast | CN | Small | This brightly colored, long-necked amphibian has six legs, a fanged snout, and numerous finlets... |
| Water Leaper | 2 | magical beast | CN | Small | This vicious monster has webbed wings, a mouth full of sharp teeth, and a long tail ending a... |
| Werebat (Human Form) | 3 | humanoid | NE | Medium | |
| Werecrocodile (Human Form) | 3 | humanoid | NE | Medium | |
| Weretiger (Human Form) | 4 | humanoid | NE | Medium | |
| Will-o’-wisp | 6 | aberration | CE | Small | |
| Witchfire | 9 | undead | CE | Medium | Bathed in sickly green flames, this insubstantial specter of a beautiful young woman floats just... |
| Ypotryll | 15 | magical beast | N | Huge | This ugly creature’s porcine head features multiple horns and tusks. Its muscular body ripples... |