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Terrain: Underground
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71 creatures
| Name ▲ | CR | Type | Size | Description |
|---|---|---|---|---|
| Akaname | 1 | aberration | Small | This short, spindly creature has warty, brown-red skin and large black eyes. Its long, muscular... |
| Albino Cave Solifugid | 4 | vermin | Medium | |
| 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 | |
| Ancient Sovereign Dragon | 20 | dragon | Gargantuan | |
| Ascomoid | 5 | plant | Large | What appears to be an enormous puffball begins to move on its own, rolling along at a frantic... |
| Basidirond | 5 | plant | Medium | |
| Black Pudding | 7 | ooze | Huge | |
| Blindheim | 2 | magical beast | Small | The size of a short, stocky humanoid with webbed feet and claws, this frog-like creature has... |
| Carnivorous Crystal | 11 | ooze | Medium | The facets of this crystalline formation shift and vibrate, as though in anticipation. |
| Cave Fisher | 2 | vermin | Medium | |
| Cave Scorpion | 1 | vermin | Medium | |
| Centipede Swarm | 4 | vermin | Diminutive | |
| Crysmal | 3 | outsider | Small | An animated cluster of translucent crystals shaped disturbingly like a gemstone scorpion... |
| Cytillipede | 6 | magical beast | Large | This segmented creature has a chitinous body covered in patches of glowing, purple fungus.... |
| Darkmantle | 1 | magical beast | Small | |
| Deathtrap Ooze | 8 | ooze | Large | The killing blade of this horrific trap drips with an animated sheen of foul brown-orange slime. |
| Dracolisk | 7 | dragon | Medium | |
| Earth Veela | 7 | outsider | Medium | |
| Executioner’s Hood | 2 | aberration | Tiny | |
| Flail Snail | 4 | magical beast | Large | This enormous snail has a brightly colored shell and four tentacles on its head, each tipped... |
| Fungal Crawler | 3 | aberration | Small | This giant fanged cricket is caked in pungent fungal growths and topped with a mushroom-like cap. |
| Fungus Leshy | 2 | plant | Small | |
| Gelatinous Cube | 3 | ooze | Large | |
| Ghost Scorpion | 1/2 | vermin | Small | |
| Giant Centipede | 1/2 | vermin | Medium | |
| Giant Flea | 1/2 | vermin | Small | |
| Giant Scorpion | 3 | vermin | Large | |
| Giant Slug | 8 | vermin | Huge | |
| Giant Termite | 3 | vermin | Medium | |
| Giant Whiptail Centipede | 3 | vermin | Huge | |
| Gibbering Mouther | 5 | aberration | Medium | |
| Goblin Dog | 1 | animal | Medium | |
| Gorgon | 8 | magical beast | Large | |
| Gray Ooze | 4 | ooze | Medium | |
| Grick | 3 | aberration | Medium | This pallid, slimy, worm-like creature is the size of a human, its mouth a sickening tangle of... |
| Hag Eye Ooze | 3 | ooze | Small | A single eye stares unblinking from an amorphous blob. A transparent pseudopod extends from the mass. |
| Hungry Flesh | 3 | ooze | Large | A quivering pile of tumorous flesh, this creature leaves a trail of slime as it hungrily... |
| Living Wall | 4 | construct | Large | This gruesome wall is made stacked corpses mortared together into an unyielding mass of grasping... |
| Lunarma | 6 | aberration | Medium | This monstrous crablike creature hovers in midair, its three clawed tentacles snapping aggressively. |
| Lurker Above | 7 | aberration | Huge | |
| Magma Ooze | 7 | ooze | Large | This seething mass of bubbling molten rock churns and moves of its own hungry accord. |
| Mobat | 3 | magical beast | Large | |
| Mudlord | 6 | outsider | Medium | This fluid creature’s roughly humanoid form is composed entirely of thick gobbets of soggy, brown mud. |
| Ochre Jelly | 5 | ooze | Large | |
| Ogre Spider | 5 | vermin | Huge | |
| Otyugh | 4 | aberration | Large | |
| Pech | 3 | fey | Small | This pale yellow humanoid has blank, bulging white eyes and gangly arms and legs. It clutches a... |
| Phantom Fungus | 3 | plant | Medium | Portions of this three-stalked fungoid monster’s body seem to fade in and out of sight. A large... |
| Phycomid | 4 | plant | Small | This tangle of purple-capped mushrooms growing out of a nasty green sludge shudders and writhes,... |
| Purple Worm | 12 | magical beast | Gargantuan | |
| Rat King | 5 | magical beast | Small | Squeaks and chittering cries rise from a tangle of diseased rats with their tails knotted together. |
| Roiling Oil | 6 | ooze | Large | This viscous heap slides like an inky spill. It’s the color of a starless night sky, and a thick... |
| Rust Monster | 3 | aberration | Medium | |
| Shard Slag | 8 | ooze | Huge | This smoldering mass of metal-encrusted goo sports half a dozen pseudopods, each tipped with a... |
| Slithering Tracker | 4 | ooze | Small | A long, moist streak along the dark stone suddenly undulates like a serpent and then rises up to attack. |
| Slurk | 2 | magical beast | Medium | This disgusting beast looks like a slime-covered toad, but with two walrus-like tusks jutting... |
| Svirfneblin | 1 | humanoid | Small | |
| Tentamort | 4 | aberration | Medium | This dark blue creature has a conical body covered in angry red eyes and numerous tentacles, two... |
| Termite Swarm | 6 | vermin | Fine | The ground teems with crawling termites, biting and stinging as they come. |
| Titan Centipede | 9 | vermin | Colossal | |
| Trapper | 8 | aberration | Huge | |
| Tsaalgrend | 2 | plant | Small | Strange, translucent gas bladders carry this tangle of thorny, purple vines and clumps of mold... |
| Tyrant Jelly | 9 | ooze | Large | This amber-colored ooze contains the preserved larva of a giant insect, almost like a monstrous brain. |
| Vegepygmy | 1/2 | plant | Small | |
| Violet Fungus | 3 | plant | Medium | |
| Wyrwood | 1/2 | construct | Small | Though obviously a wooden construct, this small, nimble creature moves fluidly and purposefully. |
| Xenopterid | 7 | vermin | Medium | What appears to be this creature’s cloak unfurls into bug wings, and its apparently human face... |
| Yellow Musk Creeper | 2 | plant | Medium |