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Alignment: N
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Movement: Swim
161 creatures
| Name ▲ | CR | Type | Size | Description |
|---|---|---|---|---|
| Abaia | 10 | magical beast | Huge | This multi-eyed eel’s brightly colored markings shift in complex, ever-changing patterns. |
| Adult Cloud Dragon | 13 | dragon | Huge | |
| Akhlut | 13 | magical beast | Huge | A dorsal fin rises up from the back of this immense black-and- white-furred, wolflike beast. |
| Amoeba, Giant | 1 | ooze | Small | This blob of protoplasm is somewhat transparent, allowing the bones of undigested meals and a... |
| Amoeba Swarm | 1 | ooze | Fine | Thousands of tiny gelatinous clots of animate ooze swarm in a wet mound, surrounded by a cloying... |
| Amphisbaena | 4 | magical beast | Large | This large snake has two heads, one at each end of its long, coiling body. Both display large... |
| Ancient Cloud Dragon | 18 | dragon | Gargantuan | |
| Archelon | 5 | animal | Huge | |
| Basilosaurus | 12 | animal | Gargantuan | |
| Blindheim | 2 | magical beast | Small | The size of a short, stocky humanoid with webbed feet and claws, this frog-like creature has... |
| Blue Whale | 12 | animal | Colossal | |
| Boilborn | 1 | ooze | Tiny | Like some taut pustule ready to burst, this mobile wound scuttles on a bristle of slick hairs. |
| Bull Shark | 2 | animal | Medium | |
| Bunyip | 3 | magical beast | Medium | A disturbing combination of shark and seal, this brown-furred creature has a wide mouth filled... |
| Cameroceras | 11 | animal | Huge | Emerging from the open end of a long, conical shell, this huge creature’s unblinking eyes peer... |
| Carnivorous Blob | 13 | ooze | Colossal | Rolling and twitching like a massive wad of translucent ooze, this crimson blob reaches out... |
| Catoblepas | 12 | magical beast | Large | This ugly creature has a boar-like head with short antlers, a thick bullish body covered in... |
| Ceratioidi | 3 | monstrous humanoid | Medium | This flabby, fishlike humanoid has the wide mouth, bulging eyes, and dangling, luminescent flesh... |
| Clockwork Dragon | 16 | construct | Huge | Though made of thousands of metal parts, this masterpiece of gleaming metal glides through the... |
| Clockwork Leviathan | 12 | construct | Huge | Long and metallic, this serpentine construction resembles a mechanical eel with several... |
| Compsognathus | 1/2 | animal | Tiny | |
| Constrictor Snake | 2 | animal | Medium | |
| Crab Swarm | 4 | vermin | Diminutive | |
| Crocodile | 2 | animal | Large | |
| Cuero | 5 | aberration | Large | The pink, fleshy underside of this flat, aquatic creature features a large circular maw of fangs. |
| Death’s Head Jellyfish | 1 | vermin | Small | |
| Deep Merfolk | 3 | humanoid | Medium | |
| Deep Sea Serpent | 19 | magical beast | Gargantuan | |
| Dire Crocodile | 9 | animal | Gargantuan | |
| Dire Polar Bear | 8 | animal | Large | |
| Dire Rat | 1/3 | animal | Small | |
| Dire Shark (Megalodon) | 9 | animal | Gargantuan | |
| Divine Guardian Hydra | 5 | magical beast | Huge | |
| Dolphin | 1/2 | animal | Medium | |
| Dragon Turtle | 9 | dragon | Huge | |
| Echeneis | 1 | magical beast | Small | This thin, colorful fish has a broad, segmented sucker above its narrow mouth. A line of spines... |
| Elasmosaurus | 7 | animal | Huge | |
| Elder Fire Elemental | 11 | outsider | Huge | |
| Elder Ice Elemental | 11 | outsider | Huge | |
| Elder Mud Elemental | 11 | outsider | Huge | |
| Elder Water Elemental | 11 | outsider | Huge | |
| Electric Eel | 2 | animal | Small | |
| Elohim | 23 | outsider | Huge | This one-eyed being is a strange mix of insects, fungi, and other living things shaped into a... |
| Emperor Cobra | 5 | animal | Large | |
| Emperor Walrus | 8 | animal | Gargantuan | |
| Freezing Flow | 4 | ooze | Large | This transparent blue formation of ice is as forbidding as the serpent it resembles. |
| Frog Father | 5 | animal | Huge | This elephantine amphibian has a grotesquely long tongue and beady eyes. |
| Froghemoth | 13 | aberration | Huge | |
| Gar | 1 | animal | Medium | This long, lean fish has a muscular body and a head with long jaws filled with sharp teeth. |
| Giant Anaconda | 10 | animal | Gargantuan | |
| Giant Crab | 2 | vermin | Medium | |
| Giant Dragonfly Nymph | 3 | vermin | Small | |
| Giant Frog | 1 | animal | Medium | |
| Giant Gar | 6 | animal | Huge | |
| Giant Jellyfish | 7 | vermin | Large | |
| Giant Leech | 2 | vermin | Medium | |
| Giant Mantis Shrimp | 9 | vermin | Medium | |
| Giant Muckdweller | 2 | magical beast | Large | |
| Giant Octopus | 8 | animal | Large | |
| Giant Seahorse | 3 | animal | Large | |
| Giant Snapping Turtle | 9 | animal | Gargantuan | |
| Giant Squid | 9 | animal | Huge | |
| Giant Toad | 2 | animal | Large | |
| Gibbering Mouther | 5 | aberration | Medium | |
| Globster | 5 | ooze | Large | This grotesque mass of blubber and rancid flesh piles up hideously upon itself, opening a vast... |
| Goliath Frog | 3 | animal | Large | |
| Greater Ice Elemental | 9 | outsider | Huge | |
| Greater Mud Elemental | 9 | outsider | Huge | |
| Greater Water Elemental | 9 | outsider | Huge | |
| Great White Shark | 4 | animal | Huge | |
| Great White Whale | 14 | animal | Colossal | |
| Guardian Dragon | 24 | dragon | Gargantuan | This immense dragon coils its long, serpentine body beneath spreading wings, its eyes glittering... |
| Haniver | 1/2 | fey | Tiny | |
| Hippocampus | 1 | magical beast | Large | This creature has the foreparts of a horse and the hindquarters of a fish. Its forelegs end in... |
| Huge Ice Elemental | 7 | outsider | Huge | |
| Huge Mud Elemental | 7 | outsider | Huge | |
| Huge Water Elemental | 7 | outsider | Huge | |
| Hungry Flesh | 3 | ooze | Large | A quivering pile of tumorous flesh, this creature leaves a trail of slime as it hungrily... |
| Hydra | 4 | magical beast | Huge | |
| Ichthyocentaur | 5 | monstrous humanoid | Large | This creature has an athletic human torso from the waist up, but its lower body consists of two... |
| Jellyfish Swarm | 6 | vermin | Diminutive | All but invisible in the water, this foul swarm of fist-sized jellyfish wriggles and writhes, a... |
| Julunggali | 21 | magical beast | Colossal | Resplendent lilac and white scales adorn this gigantic serpent. A number of sharp, short horns... |
| Kawa Akago | 3 | plant | Small | This combination of a lily pad and a flytrap is ringed with horrifying fangs and has another... |
| Killer Seahorse | 5 | animal | Huge | |
| Large Ice Elemental | 5 | outsider | Large | |
| Large Mud Elemental | 5 | outsider | Large | |
| Large Water Elemental | 5 | outsider | Large | |
| Leech Swarm | 4 | vermin | Diminutive | |
| Lizardfolk | 1 | humanoid | Medium | |
| Locathah | 1/2 | humanoid | Medium | This lean humanoid bears crested fins on its head and back, and has the wide-eyed and... |
| Lukwata | 11 | magical beast | Huge | A long, spiny fin runs down the length of the dolphinlike body of this eel-headed predator. |
| Makara Vahana | 9 | magical beast | Huge | |
| Manta Ray | 1 | animal | Large | |
| Medium Ice Elemental | 3 | outsider | Medium | |
| Medium Mud Elemental | 3 | outsider | Medium | |
| Medium Water Elemental | 3 | outsider | Medium | |
| Megalania | 7 | animal | Huge | |
| Merfolk | 1/3 | humanoid | Medium | |
| Monitor Lizard | 2 | animal | Medium | |
| Muckdweller | 1/4 | magical beast | Small | This bipedal lizard has mottled gray-and-brown flesh. A short dorsal fin runs the length of its... |
| Mudlord | 6 | outsider | Medium | This fluid creature’s roughly humanoid form is composed entirely of thick gobbets of soggy, brown mud. |
| Narwhal | 3 | animal | Large | |
| Ningen | 16 | monstrous humanoid | Colossal | This enormous flippered creature is as pale as an iceberg and is nearly as large. |
| Nixie | 1 | fey | Small | As it gracefully swims through the water, it becomes clear that this small, green-skinned... |
| Octopus | 1 | animal | Small | |
| Ophiotaurus | 17 | magical beast | Gargantuan | This enormous russet serpent has the head and forequarters of a ruddy bull with bronze horns and hooves. |
| Orca | 5 | animal | Huge | |
| Otter | 1/4 | animal | Tiny | |
| Penguin | 1/3 | animal | Small | |
| Platypus | 1/6 | animal | Tiny | |
| Plesiosaurus | 2 | animal | Large | |
| Poison Frog | 1/2 | animal | Tiny | |
| Polar Bear | 5 | animal | Large | |
| Purple Worm | 12 | magical beast | Gargantuan | |
| Putrid Ooze | 11 | ooze | Huge | Masses of carrion and debris break the inky surface of this enormous, undulating sludge. |
| Rat | 1/4 | animal | Tiny | |
| Rat King | 5 | magical beast | Small | Squeaks and chittering cries rise from a tangle of diseased rats with their tails knotted together. |
| Rat Swarm | 2 | animal | Tiny | |
| Sapphire Jellyfish | 11 | vermin | Huge | |
| Sargassum Fiend | 9 | plant | Large | This shifting mass of green seaweed transforms from the shape of a humanoid back to a patch of... |
| Sea Cat | 4 | magical beast | Large | This fierce creature merges the front half of a great cat with the tail and other... |
| Seal | 1/3 | animal | Small | |
| Sea Serpent | 12 | magical beast | Gargantuan | |
| Seaweed Leshy | 3 | plant | Small | |
| Shambling Mound | 6 | plant | Large | |
| Shark | 2 | animal | Large | |
| Shark-Eating Crab | 7 | vermin | Huge | |
| Shen | 24 | dragon | Gargantuan | This serpentine dragon with gold scales constantly contorts into a pattern of rings and knots. |
| Shipwrecker Crab | 13 | vermin | Colossal | |
| Shocker Lizard | 2 | magical beast | Small | |
| Siyokoy | 10 | aberration | Medium | This eel-like creature sports sharp frills that run along the back of humanoid torso and down... |
| Small Ice Elemental | 1 | outsider | Small | |
| Small Mud Elemental | 1 | outsider | Small | |
| Small Water Elemental | 1 | outsider | Small | |
| Snake Swarm | 2 | animal | Tiny | Hissing menacingly, this mass of snakes resembles a pile of slithering tentacles. |
| Snapping Turtle | 1/3 | animal | Tiny | |
| Spinosaurus | 11 | animal | Gargantuan | |
| Squid | 1 | animal | Medium | |
| Stingray | 1/2 | animal | Medium | |
| Stranglereed | 9 | plant | Large | This tangled mass of thick reeds extends from a bulbous pod split by a wide, thorn-toothed maw. |
| Terraformer | 7 | construct | Large | |
| Thalassic Behemoth | 20 | magical beast | Colossal | |
| Tizheruk | 5 | magical beast | Large | This serpentine beast undulates through the water. Its scaly skin and its flesh are clear,... |
| Tojanida | 5 | outsider | Medium | This creature resembles a cross between a turtle and a crab, with flippers instead of legs, a... |
| Trilobite | 1/4 | vermin | Tiny | |
| Tupilaq | 7 | construct | Small | This small humanoid figure grinds and clatters as it moves, its body carved from bones decorated... |
| Tylosaurus | 8 | animal | Gargantuan | |
| Undine | 1/2 | outsider | Medium | This blue-haired, blue-skinned man moves with a liquid grace. His ears are fin-like, and his... |
| Venomous Snake | 1 | animal | Medium | |
| Venomous Snake Swarm | 4 | animal | Tiny | |
| Viper | 1/2 | animal | Tiny | |
| Vishap | 19 | dragon | Colossal | This slender dragon is covered in vivid cerulean scales with four powerful wings to match. |
| Walrus | 3 | animal | Large | Two long tusks jut from the mouth of this bulky, bewhiskered creature. It walks clumsily on... |
| Water Naga | 7 | aberration | Large | Slender spines and brightly colored frills stretch back from the human-like face of this massive... |
| Water Orm | 10 | magical beast | Huge | A reptilian head on a serpentine neck slowly surfaces. Shadows beneath the water hint at a body... |
| Water Veela | 7 | outsider | Medium | |
| Water Wysp | 2 | outsider | Tiny | |
| Whale | 10 | animal | Gargantuan | This immense whale moves slowly through the water with a grace that seems incongruous, given its... |
| Wizard’s Shackle | 1/2 | aberration | Tiny | This eel-like creature has a thick, greasy body and a large, circular mouth full of tiny teeth. |
| Yamaraj | 20 | outsider | Huge | |
| Young Cloud Dragon | 9 | dragon | Large |