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CR: 5
Source
Climate
Movement: Swim
25 creatures
| Name ▲ | Type | Alignment | Size | Description |
|---|---|---|---|---|
| Archelon | animal | N | Huge | |
| Cecaelia | monstrous humanoid | CN | Medium | In place of legs, this handsome humanoid sports an octopus’s eight writhing tentacles. |
| Cuero | aberration | N | Large | The pink, fleshy underside of this flat, aquatic creature features a large circular maw of fangs. |
| Divine Guardian Hydra | magical beast | N | Huge | |
| Elder Thing | aberration | LN | Medium | This strange being has a star-shaped head and numerous writhing appendages arranged radially... |
| Emperor Cobra | animal | N | Large | |
| Frog Father | animal | N | Huge | This elephantine amphibian has a grotesquely long tongue and beady eyes. |
| Gibbering Mouther | aberration | N | Medium | |
| Globster | ooze | N | Large | This grotesque mass of blubber and rancid flesh piles up hideously upon itself, opening a vast... |
| Green Hag | monstrous humanoid | CE | Medium | |
| Grodair | magical beast | CN | Medium | Several water-dripping tentacles sprout from this four-eyed fish’s belly, while long fins... |
| Ichthyocentaur | monstrous humanoid | N | Large | This creature has an athletic human torso from the waist up, but its lower body consists of two... |
| Killer Seahorse | animal | N | Huge | |
| Large Ice Elemental | outsider | N | Large | |
| Large Mud Elemental | outsider | N | Large | |
| Large Water Elemental | outsider | N | Large | |
| Orca | animal | N | Huge | |
| Polar Bear | animal | N | Large | |
| Rat King | magical beast | N | Small | Squeaks and chittering cries rise from a tangle of diseased rats with their tails knotted together. |
| Selkie | monstrous humanoid | CN | Medium | This sleek, aquatic creature has short gray fur, webbed hands ending in sharp claws, and a mouth... |
| Tizheruk | magical beast | N | Large | This serpentine beast undulates through the water. Its scaly skin and its flesh are clear,... |
| Tojanida | outsider | N | Medium | This creature resembles a cross between a turtle and a crab, with flippers instead of legs, a... |
| Undigested Swarm | undead | NE | Tiny | This brown-and-yellow sludge appears to be made of multiple smaller globules churning in a... |
| Uraeus | magical beast | LG | Medium | This two-headed cobra flies with a large pair of sleek, black- feathered wings that sprout from... |
| Vodyanoi | monstrous humanoid | CN | Medium | This humanoid salamander carries a gnarled staff in one hand. Tendrils drape its chin,... |