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Terrain: Underground
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157 creatures
| Name ▲ | CR | Type | Alignment | Size | Environment | Description |
|---|---|---|---|---|---|---|
| Adherer | 3 | monstrous humanoid | LE | Medium | any temperate or underground | This pallid humanoid creature is wrapped in wispy strips of skin, with bits of detritus and a... |
| Akaname | 1 | aberration | N | Small | any urban or underground | This short, spindly creature has warty, brown-red skin and large black eyes. Its long, muscular... |
| Albino Cave Solifugid | 4 | vermin | N | Medium | any underground | |
| Amoeba, Giant | 1 | ooze | N | Small | any land or underground | This blob of protoplasm is somewhat transparent, allowing the bones of undigested meals and a... |
| Amoeba Swarm | 1 | ooze | N | Fine | any land or underground | Thousands of tiny gelatinous clots of animate ooze swarm in a wet mound, surrounded by a cloying... |
| Amphisbaena | 4 | magical beast | N | Large | temperate hills or underground | 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 | any underground (Plane of Earth) | |
| Ancient Crystal Dragon | 15 | dragon | CG | Huge | any mountains or underground (Plane of Fire) | |
| Ancient Sovereign Dragon | 20 | dragon | N | Gargantuan | any underground | |
| Ascomoid | 5 | plant | N | Large | underground | What appears to be an enormous puffball begins to move on its own, rolling along at a frantic... |
| Azruverda | 13 | aberration | CG | Huge | underground | A humanoid head peers forth from this enormous creature’s beautifully iridescent, spike-covered... |
| Basidirond | 5 | plant | N | Medium | any non-cold underground | |
| Bhole | 17 | magical beast | CN | Colossal | any underground | This titanic worm heaves its endless bulk into the air, raising one end as if ready to strike... |
| Black Pudding | 7 | ooze | N | Huge | any underground | |
| Blindheim | 2 | magical beast | N | Small | any underground | The size of a short, stocky humanoid with webbed feet and claws, this frog-like creature has... |
| Brain Ooze | 7 | ooze | NE | Tiny | any ruins or underground | Two slimy tentacles protrude from the sides of this brain-shaped mass of quivering ooze. |
| Buggane | 5 | monstrous humanoid | CE | Large | any underground | This hairless, hunchbacked giant has cruel tusks and two enormous, blunt-clawed fists that look... |
| Caligni | 1/2 | humanoid | CN | Medium | any underground | |
| Carnivorous Crystal | 11 | ooze | N | Medium | any underground (Plane of Earth) | The facets of this crystalline formation shift and vibrate, as though in anticipation. |
| Cave Fisher | 2 | vermin | N | Medium | any underground | |
| Cave Giant | 6 | humanoid | CE | Large | any underground | |
| Cave Scorpion | 1 | vermin | N | Medium | any underground | |
| Centipede Swarm | 4 | vermin | N | Diminutive | temperate or warm forest or underground | |
| Charda | 7 | monstrous humanoid | CN | Small | cold aquatic or underground | Armored in dense, bony plates, this four-armed creature drools wretched strings of black bile... |
| Choker | 2 | aberration | CE | Small | any underground | |
| Cloaker | 5 | aberration | CN | Large | underground | |
| Crypt Thing | 5 | undead | NE | Medium | any underground | Shreds of leathery flesh cling to this skeletal figure’s body, while twin motes of fiery light... |
| Crysmal | 3 | outsider | N | Small | any underground (Plane of Earth) | An animated cluster of translucent crystals shaped disturbingly like a gemstone scorpion... |
| Cytillipede | 6 | magical beast | N | Large | any underground | This segmented creature has a chitinous body covered in patches of glowing, purple fungus.... |
| Dark Caller | 5 | humanoid | CE | Medium | any underground | Wrapped in tatters of dark musty robes, this humanoid figure weaves malevolent magic. |
| Dark Creeper | 2 | humanoid | CN | Small | any underground | |
| Dark Dancer | 1 | humanoid | CN | Small | any underground | Dancing in a wicked celebration, this slight humanoid is wrapped head to toe in dirty scraps of... |
| Darkmantle | 1 | magical beast | N | Small | any underground | |
| Dark Naga | 8 | aberration | LE | Large | any underground | |
| Dark Slayer | 3 | humanoid | CE | Small | any underground | This small humanoid is clothed in tattered rags from head to foot. Only its sinister eyes and... |
| Dark Stalker | 4 | humanoid | CN | Medium | any underground | |
| Deathtrap Ooze | 8 | ooze | N | Large | any underground | The killing blade of this horrific trap drips with an animated sheen of foul brown-orange slime. |
| Decapus | 4 | aberration | CE | Medium | temperate forests or underground | This swollen cephalopod has ten writhing tentacles and a hideously monstrous face with pale,... |
| Destrachan | 8 | aberration | NE | Large | underground | The hunched, reptilian beast lopes on two clawed feet, its eyeless head dominated by a huge... |
| Dire Corby | 1 | monstrous humanoid | NE | Medium | any underground | This creature looks like a humanoid crow with oily black feathers, glittering eyes, and a sharp beak. |
| Dracolisk | 7 | dragon | N | Medium | temperate swamp or underground | |
| Drider | 7 | aberration | CE | Large | any underground | |
| Drow | 1/3 | humanoid | CE | Medium | underground | |
| Duergar | 1/3 | humanoid | LE | Medium | any underground | |
| Earth Veela | 7 | outsider | N | Medium | any mountains or underground (Plane of Earth) | |
| Executioner’s Hood | 2 | aberration | N | Tiny | any underground | |
| Faceless Stalker (Ugothol) | 4 | aberration | CE | Medium | any swamps or underground | |
| Festering Spirit | 8 | undead | CE | Medium | any land or underground | This ghostlike creature reeks of the grave and drips with putrescent goo. |
| Flail Snail | 4 | magical beast | N | Large | underground | This enormous snail has a brightly colored shell and four tentacles on its head, each tipped... |
| Flumph | 1 | aberration | LG | Small | any land or underground | This pale, jellyfish-like creature floats gently in the air, two long eyestalks extending from... |
| Formian Myrmarch | 10 | monstrous humanoid | LN | Large | warm or temperate land or underground | This horse-sized insect has a brilliant red carapace, and its monstrous face reflects great... |
| Formian Queen | 17 | monstrous humanoid | LN | Large | warm or temperate land or underground | This large and majestic creature is nearly immobile, her massive abdomen swollen with her... |
| Formian Taskmaster | 7 | monstrous humanoid | LN | Medium | warm or temperate land or underground | This centaurlike creature is equipped with an ant’s mandibles and antennae. |
| Formian Warrior | 3 | monstrous humanoid | LN | Medium | warm or temperate land or underground | Armored from head to toe in gleaming black-and-red chitin, this insectile warrior’s tail ends in... |
| Formian Worker | 1/2 | monstrous humanoid | LN | Small | warm or temperate land or underground | This small, centaurlike ant creature bears a huge, bulging sack on its armored back. |
| Fungal Crawler | 3 | aberration | N | Small | any underground | This giant fanged cricket is caked in pungent fungal growths and topped with a mushroom-like cap. |
| Fungal Nymph | 8 | plant | CG | Medium | any ruins or underground | |
| Fungus Leshy | 2 | plant | N | Small | any swamp or underground | |
| Gearghost | 5 | undead | CE | Tiny | any urban or underground | Grasping arms emerge from a tangled cluster of debris and mechanical parts. A metal skull hovers... |
| Gelatinous Cube | 3 | ooze | N | Large | any underground | |
| Ghonhatine | 10 | aberration | CE | Large | any underground | |
| Ghorazagh | 13 | aberration | NE | Large | any underground | With an armored spherical body, numerous tentacular legs, and a multi-eyed visage, this... |
| Ghost Scorpion | 1/2 | vermin | N | Small | warm deserts or underground | |
| Giant Centipede | 1/2 | vermin | N | Medium | temperate or warm forest or underground | |
| Giant Crawling Hand | 5 | undead | NE | Medium | any land or underground | |
| Giant Flea | 1/2 | vermin | N | Small | any land or underground | |
| Giant Scorpion | 3 | vermin | N | Large | warm or temperate deserts, forests, plains, or underground | |
| Giant Slug | 8 | vermin | N | Huge | temperate and warm marshes and underground | |
| Giant Termite | 3 | vermin | N | Medium | warm forests, plains, or underground | |
| Giant Whiptail Centipede | 3 | vermin | N | Huge | temperate or warm forests or underground | |
| Gibbering Mouther | 5 | aberration | N | Medium | any underground | |
| Goblin Dog | 1 | animal | N | Medium | temperate forest, swamp, or underground | |
| Goblin Snake | 1 | aberration | CE | Small | any underground or swamps | A gray, lipless goblin head with serpent’s fangs sits atop the sinuous black body of this... |
| Gorgon | 8 | magical beast | N | Large | temperate plains, rocky hills, and underground | |
| Gray Ooze | 4 | ooze | N | Medium | cold marshes and underground | |
| Grick | 3 | aberration | N | Medium | any underground | This pallid, slimy, worm-like creature is the size of a human, its mouth a sickening tangle of... |
| Grothlut | 3 | aberration | CE | Medium | any underground | |
| Gryph | 1 | magical beast | NE | Small | temperate forests or underground | This hawk-sized avian looks much like a six-legged stork. Its feathers are unkempt and greasy,... |
| Gug | 10 | aberration | CE | Large | any underground | This towering menace has a horrible, vertically aligned mouth and arms that split at the elbows... |
| Hag Eye Ooze | 3 | ooze | N | Small | temperate marshes or underground | A single eye stares unblinking from an amorphous blob. A transparent pseudopod extends from the mass. |
| Half-Fiend Minotaur | 6 | outsider | CE | Large | temperate ruins or underground | |
| Halsora | 7 | aberration | CE | Small | any underground | |
| Hollow Serpent | 16 | undead | NE | Large | any underground | This creature looks like an oversized, empty snakeskin, its body covered in barbs and maw filled... |
| Hungry Flesh | 3 | ooze | N | Large | any land or underground | A quivering pile of tumorous flesh, this creature leaves a trail of slime as it hungrily... |
| Hyakume | 15 | aberration | NE | Large | any underground | This bloated creature’s eyes protrude from between the fleshy fat rolls of its neckless, hulking form. |
| Ice Troll | 4 | humanoid | CE | Large | cold mountains or underground | |
| Iku-Turso | 8 | aberration | NE | Medium | cold or temperate water or underground | This grotesque, emerald-scaled creature resembles a crossbreed of an eel, a viperfish, and a... |
| Immortal Ichor | 17 | ooze | NE | Medium | any ruins or underground | This strange—almost beautiful—purple ooze thrums with powerful energy and glows with an eerie light. |
| Intellect Devourer | 8 | aberration | CE | Small | any underground | |
| Irnakurse | 9 | aberration | CE | Large | any underground | |
| Jinkin | 1 | fey | CE | Tiny | any underground or urban | |
| Kabandha | 9 | humanoid | LN | Large | any land or underground | |
| Kobold | 1/4 | humanoid | LE | Small | temperate underground or deep forest | |
| Lampad | 5 | fey | CN | Medium | any underground | Tears stream from this beautiful but sullen creature’s eyes, forming a puddle beneath her delicate feet. |
| Living Wall | 4 | construct | N | Large | any ruins or underground | This gruesome wall is made stacked corpses mortared together into an unyielding mass of grasping... |
| Lunarma | 6 | aberration | N | Medium | any underground | This monstrous crablike creature hovers in midair, its three clawed tentacles snapping aggressively. |
| Lurker Above | 7 | aberration | N | Huge | any underground | |
| Magma Ooze | 7 | ooze | N | Large | any volcano or underground | This seething mass of bubbling molten rock churns and moves of its own hungry accord. |
| Medusa | 7 | monstrous humanoid | LE | Medium | temperate marshes and underground | |
| Mercane | 5 | outsider | LN | Large | any land or underground | The tall, blue-skinned humanoid is clad in loose, flowing robes. Its alien face has too many... |
| Minotaur | 4 | monstrous humanoid | CE | Large | temperate ruins or underground | |
| Mite | 1/4 | fey | LE | Small | any underground | |
| Mobat | 3 | magical beast | N | Large | temperate or warm forests, hills, or underground | |
| Mongrelman | 1 | monstrous humanoid | LN | Medium | any ruins or underground | Ivory tusks, insect chitin, matted fur, scaly flesh, and more combine to form a hideous humanoid shape. |
| Morlock | 2 | monstrous humanoid | CE | Medium | any underground | |
| Mudlord | 6 | outsider | N | Medium | temperate or warm marshes or underground | This fluid creature’s roughly humanoid form is composed entirely of thick gobbets of soggy, brown mud. |
| Myceloid | 4 | plant | NE | Medium | any underground | This shambling fungus creature bears a strong resemblance to a rotund human, but with a mushroom... |
| Necrocraft | 3 | undead | NE | Medium | any land or underground | Thick muscle and jutting bone from multiple corpses fused together form a winged, humanlike predator. |
| Neothelid | 15 | aberration | CE | Gargantuan | any underground | |
| Nuglub | 2 | fey | CE | Small | any underground or urban | |
| Nuno | 1/4 | fey | NE | Tiny | any warm land or underground | |
| Ochre Jelly | 5 | ooze | N | Large | temperate underground or marshes | |
| Ogre Spider | 5 | vermin | N | Huge | temperate or cold hills or underground | |
| Orc | 1/3 | humanoid | CE | Medium | temperate hills, mountains, or underground | |
| Otyugh | 4 | aberration | N | Large | any underground | |
| Owb | 6 | outsider | NE | Medium | any land or underground (Plane of Shadow) | This thing looks like a skeletal human torso coated in liquid shadow, obscuring its bones but... |
| Pech | 3 | fey | N | Small | any underground (Plane of Earth) | This pale yellow humanoid has blank, bulging white eyes and gangly arms and legs. It clutches a... |
| Phantom Fungus | 3 | plant | N | Medium | any underground | Portions of this three-stalked fungoid monster’s body seem to fade in and out of sight. A large... |
| Phycomid | 4 | plant | N | Small | any underground | This tangle of purple-capped mushrooms growing out of a nasty green sludge shudders and writhes,... |
| Purple Worm | 12 | magical beast | N | Gargantuan | any underground | |
| Rat King | 5 | magical beast | N | Small | any urban or underground | Squeaks and chittering cries rise from a tangle of diseased rats with their tails knotted together. |
| Redcap | 6 | fey | NE | Small | temperate forests, mountains, or underground | Like some miniscule, wicked old man, this snarling little humanoid wears metal boots and a... |
| Rock Troll | 6 | humanoid | CE | Large | any underground | |
| Roiling Oil | 6 | ooze | N | Large | any underground | This viscous heap slides like an inky spill. It’s the color of a starless night sky, and a thick... |
| Roper | 12 | aberration | CE | Large | any underground | |
| Rust Monster | 3 | aberration | N | Medium | any underground | |
| Sabosan | 5 | monstrous humanoid | NE | Medium | warm forests or underground | This batlike humanoid has a lean, muscular body covered with fur and two large, leathery wings. |
| Sayona | 12 | undead | CE | Medium | any land or underground | This revolting withered corpse of a woman is dressed in revealing clothes, its bare skin wet... |
| Serpentfolk | 4 | monstrous humanoid | NE | Medium | any land (usually jungles or underground) | This serpentine humanoid has bright scaly skin, a long sinuous tail, and a fanged serpent’s head. |
| Seugathi | 6 | aberration | CE | Large | any underground | This worm-like monster has a hideous face of eyes and hooked jaws. It wields a wand and a sword... |
| Shadow Roper | 13 | outsider | CE | Large | any underground | |
| Shard Slag | 8 | ooze | N | Huge | any volcanoes or underground | This smoldering mass of metal-encrusted goo sports half a dozen pseudopods, each tipped with a... |
| Shoggoth | 19 | ooze | CN | Huge | cold aquatic or underground | |
| Skaveling | 5 | undead | CE | Large | any underground | |
| Skulk | 1 | humanoid | CE | Medium | any land or underground | This smooth-skinned, hairless humanoid has penetrating eyes and skin that shifts and changes to... |
| Skum (Ulat-Kini) | 2 | monstrous humanoid | LE | Medium | temperate or cold aquatic or underground | |
| Slag Giant | 7 | humanoid | LN | Large | warm mountains or underground | |
| Slithering Tracker | 4 | ooze | N | Small | any ruins or underground | A long, moist streak along the dark stone suddenly undulates like a serpent and then rises up to attack. |
| Slurk | 2 | magical beast | N | Medium | temperate swamps or underground | This disgusting beast looks like a slime-covered toad, but with two walrus-like tusks jutting... |
| Svirfneblin | 1 | humanoid | N | Small | any underground | |
| Taniniver | 18 | dragon | NE | Huge | any land or underground | This legless, winged, white-eyed dragon is covered in patches of diseased flesh, squirming with... |
| Tentamort | 4 | aberration | N | Medium | any marshes or underground | This dark blue creature has a conical body covered in angry red eyes and numerous tentacles, two... |
| Termite Swarm | 6 | vermin | N | Fine | warm forests, plains, or underground | The ground teems with crawling termites, biting and stinging as they come. |
| Titan Centipede | 9 | vermin | N | Colossal | temperate or warm forests or underground | |
| Totenmaske | 7 | undead | NE | Medium | any land or underground | This spindly, skeletal humanoid has moldy green flesh, long talons for hands, and a head that... |
| Trapper | 8 | aberration | N | Huge | any underground | |
| Troglodyte | 1 | humanoid | CE | Medium | any underground | |
| Tsaalgrend | 2 | plant | N | Small | any underground | Strange, translucent gas bladders carry this tangle of thorny, purple vines and clumps of mold... |
| Tyrant Jelly | 9 | ooze | N | Large | any underground | This amber-colored ooze contains the preserved larva of a giant insect, almost like a monstrous brain. |
| Vampiric Mist | 3 | aberration | NE | Medium | temperate or warm swamps or underground | A cloud of crimson vapor reeking of fresh blood hangs in the air, reaching out with lashing claws. |
| Vegepygmy | 1/2 | plant | N | Small | any underground | |
| Vemerak | 14 | aberration | CE | Huge | any underground | This huge monstrosity seems like some alien, clawed insect, with vaguely humanoid features and... |
| Vexgit | 1 | fey | LE | Tiny | any underground or urban | |
| Violet Fungus | 3 | plant | N | Medium | any underground | |
| Wyrwood | 1/2 | construct | N | Small | any ruins or underground | Though obviously a wooden construct, this small, nimble creature moves fluidly and purposefully. |
| Xenopterid | 7 | vermin | N | Medium | any land or underground | What appears to be this creature’s cloak unfurls into bug wings, and its apparently human face... |
| Yellow Musk Creeper | 2 | plant | N | Medium | temperate or warm forests and underground |