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Climate: Temperate
Movement: Swim
63 creatures
| Name ▲ | CR | Type | Alignment | Size | Description |
|---|---|---|---|---|---|
| Alpluachra | 1/2 | fey | CN | Diminutive | This minuscule creature resembles a newt with three tails. It’s covered in a transparent slime,... |
| Amphisbaena | 4 | magical beast | N | Large | This large snake has two heads, one at each end of its long, coiling body. Both display large... |
| Ancient Gold Dragon | 20 | dragon | LG | Gargantuan | |
| Ancient Sea Dragon | 17 | dragon | CG | Gargantuan | |
| Archelon | 5 | animal | N | Huge | |
| Boggard | 2 | humanoid | CE | Medium | |
| Chuul | 7 | aberration | CE | Large | |
| Compsognathus | 1/2 | animal | N | Tiny | |
| Cuero | 5 | aberration | N | Large | The pink, fleshy underside of this flat, aquatic creature features a large circular maw of fangs. |
| Divine Guardian Hydra | 5 | magical beast | N | Huge | |
| Dragon Turtle | 9 | dragon | N | Huge | |
| Echeneis | 1 | magical beast | N | Small | This thin, colorful fish has a broad, segmented sucker above its narrow mouth. A line of spines... |
| Emperor Cobra | 5 | animal | N | Large | |
| Faerie Dragon | 2 | dragon | CG | Tiny | A pair of brightly colored butterfly wings sprouts from the back of this miniature dragon. A... |
| Fey Giant Toad | 3 | fey | CN | Large | |
| Fossegrim | 4 | fey | NE | Medium | This striking, blue-eyed man with luminous skin and flowing white hair holds an ethereal harp. |
| Froghemoth | 13 | aberration | N | Huge | |
| Gar | 1 | animal | N | Medium | This long, lean fish has a muscular body and a head with long jaws filled with sharp teeth. |
| Giant Dragonfly Nymph | 3 | vermin | N | Small | |
| Giant Frog | 1 | animal | N | Medium | |
| Giant Gar | 6 | animal | N | Huge | |
| Giant Leech | 2 | vermin | N | Medium | |
| Giant Muckdweller | 2 | magical beast | N | Large | |
| Giant Snapping Turtle | 9 | animal | N | Gargantuan | |
| Giant Toad | 2 | animal | N | Large | |
| Gorynych | 15 | dragon | CE | Huge | This sleek, three-headed dragon rears up on its hind legs, wings spread and flames licking out... |
| Green Hag | 5 | monstrous humanoid | CE | Medium | |
| Haniver | 1/2 | fey | N | Tiny | |
| Hydra | 4 | magical beast | N | Huge | |
| Ichthyocentaur | 5 | monstrous humanoid | N | Large | This creature has an athletic human torso from the waist up, but its lower body consists of two... |
| Iku-Turso | 8 | aberration | NE | Medium | This grotesque, emerald-scaled creature resembles a crossbreed of an eel, a viperfish, and a... |
| Jorogumo | 12 | monstrous humanoid | NE | Medium | Eight spindly spider legs, flocked with coarse black hairs, stretch from the back of this... |
| 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 | |
| Locathah | 1/2 | humanoid | N | Medium | This lean humanoid bears crested fins on its head and back, and has the wide-eyed and... |
| Marsh Giant | 8 | humanoid | CE | Large | |
| Merfolk | 1/3 | humanoid | N | Medium | |
| Merrow, Freshwater | 3 | humanoid | NE | Large | |
| Merrow, Saltwater | 6 | humanoid | NE | Huge | |
| Mobogo | 10 | magical beast | CE | Huge | This grotesque creature looks like a gigantic toad with leathery wings, fangs, horns, and three... |
| 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. |
| Nixie | 1 | fey | N | Small | As it gracefully swims through the water, it becomes clear that this small, green-skinned... |
| Nymph | 7 | fey | CG | Medium | |
| Octopus | 1 | animal | N | Small | |
| Peluda | 10 | dragon | NE | Large | This long-necked dragon has steamy breath, a lashing tail, and a back covered in hundreds of quills. |
| Platypus | 1/6 | animal | N | Tiny | |
| Plesiosaurus | 2 | animal | N | Large | |
| Rat | 1/4 | animal | N | Tiny | |
| River Drake | 3 | dragon | NE | Medium | |
| Sahuagin | 2 | monstrous humanoid | LE | Medium | |
| Sapphire Jellyfish | 11 | vermin | N | Huge | |
| Shambling Mound | 6 | plant | N | Large | |
| Skum (Ulat-Kini) | 2 | monstrous humanoid | LE | Medium | |
| Snapping Turtle | 1/3 | animal | N | Tiny | |
| Spirit Naga | 9 | aberration | CE | Large | |
| Tizheruk | 5 | magical beast | N | Large | This serpentine beast undulates through the water. Its scaly skin and its flesh are clear,... |
| Venomous Snake | 1 | animal | N | Medium | |
| Viper | 1/2 | animal | N | Tiny | |
| Vouivre | 12 | monstrous humanoid | CE | Large | One half of this creature is a nude woman, and the other is the front end of a slithering, winged dragon. |
| Wakandagi | 14 | outsider | NG | Large | This antlered beast combines the features of an elegant deer and a slithering serpent. |
| Water Naga | 7 | aberration | N | Large | Slender spines and brightly colored frills stretch back from the human-like face of this massive... |