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Terrain: Underground
Climate
Movement: Swim
16 creatures
| Name ▲ | CR | Type | Alignment | Size | Description |
|---|---|---|---|---|---|
| Amoeba, Giant | 1 | ooze | N | Small | This blob of protoplasm is somewhat transparent, allowing the bones of undigested meals and a... |
| Amoeba Swarm | 1 | ooze | N | Fine | Thousands of tiny gelatinous clots of animate ooze swarm in a wet mound, surrounded by a cloying... |
| 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 Cloud Dragon | 18 | dragon | N | Gargantuan | |
| Blindheim | 2 | magical beast | N | Small | The size of a short, stocky humanoid with webbed feet and claws, this frog-like creature has... |
| Charda | 7 | monstrous humanoid | CN | Small | Armored in dense, bony plates, this four-armed creature drools wretched strings of black bile... |
| Fungal Nymph | 8 | plant | CG | Medium | |
| Gibbering Mouther | 5 | aberration | 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... |
| Hungry Flesh | 3 | ooze | N | Large | A quivering pile of tumorous flesh, this creature leaves a trail of slime as it hungrily... |
| Iku-Turso | 8 | aberration | NE | Medium | This grotesque, emerald-scaled creature resembles a crossbreed of an eel, a viperfish, and a... |
| Mudlord | 6 | outsider | N | Medium | This fluid creature’s roughly humanoid form is composed entirely of thick gobbets of soggy, brown mud. |
| Purple Worm | 12 | magical beast | N | Gargantuan | |
| Rat King | 5 | magical beast | N | Small | Squeaks and chittering cries rise from a tangle of diseased rats with their tails knotted together. |
| Shoggoth | 19 | ooze | CN | Huge | |
| Skum (Ulat-Kini) | 2 | monstrous humanoid | LE | Medium |