| Creature | Terrain | Climate | Campaign | Reference |
|---|---|---|---|---|
| Aballin | Subterranean | Temp/Trop | Any | MAI |
| Aboleth | Subterranean | Temp/Trop | Any | MM 6 |
| Aboleth, Savant | Subterranean | Any | Any | MAII 6 |
| Achaierai | Subterranean | Any | Any | FFMC |
| Automaton, Ferragam | Subterranean | Any | Any | MAII 14 |
| Automaton, Minor | Subterranean | Any | Any | MAII 17 |
| Automaton, Silversann | Subterranean | Any | Any | MAII 14 |
| Automaton, Thanatar | Subterranean | Any | Any | MAII 14 |
| Bat, Doom- | Subterranean | Any | Any | FF 27 |
| Bat, Fire | Subterranean | Tropical | Any | OMII 16 |
| Bat, Huge | Subterranean | Temp/Trop | Any | MM 15 |
| Bat, Large, Vampire | Subterranean | Any | Any | DRC 159 |
| Beetle, Dragon | Subterranean | Any | Any | MAII 19 |
| Beetle, Scarab, Giant | Subterranean | Temperate | Ravenloft | RVIII 16 |
| Beetle, Scarab, Grave | Subterranean | Temperate | Ravenloft | RVIII 16 |
| Beetle, Scarab, Monstrous | Subterranean | Temperate | Ravenloft | RVIII 16 |
| Bi-Nou | Subterranean | Any | Any | MAII 20 |
| Bi-nou, Rocklord | Subterranean | Any | Any | MAII 20 |
| Blindheim | Subterranean | Any | Any | FF 15 |
| Boggle | Subterranean | Any | Any | MAII 22 |
| Bowler | Subterranean | Any | Any | OMII 21 |
| Bugbear | Subterranean | Any | Any | MM 32 |
| Bugbear, Chief | Subterranean | Any | Any | MM 32 |
| Bugbear, Leader | Subterranean | Any | Any | MM 32 |
| Carrion Crawler | Subterranean | Any | Any | MM 35 |
| Carrion Stalker | Subterranean | Any | Ravenloft | RVIII 20 |
| Cave Fisher | Subterranean | Any | Any | MM 40 |
| Cave Moray | Subterranean | Any | Any | OMII 24 |
| Centipede, Tunnel | Subterranean | Any | Any | MM 42 |
| Chitine | Subterranean | Any | Any | MAI |
| Chu-u | Subterranean | Any | Kara-Tur | KTMC |
| Cildabrin | Subterranean | Sub-Trop/Trop | Any | MAIII 22 |
| Cloaker | Subterranean | Any | Any | MM 44 |
| Creeper, Scum | Subterranean | Any | Any | OMII 107 |
| Curst | Subterranean | Any | Any | MAII 32 |
| Dark Creeper | Subterranean | Temperate | Any | FFMC |
| Dark Stalker | Subterranean | Temperate | Any | FFMC |
| Darktentacles | Subterranean | Any | Any | MAII 33 |
| Denzelian | Subterranean | Any | Any | FFMC |
| Dire Corby | Subterranean | Any | Any | FF 26 |
| Disir | Subterranean | Any | Dragonlance | DLMC |
| Dragon, Deep | Subterranean | Any | Any | MM 82 |
| Dragon, Ghost Dragon | Subterranean | Any | Any | MAIII 27 |
| Dragon, Oriental, Li Lung (Earth) | Subterranean | Temp/Trop | Forgotten Realms | FR1MC |
| Dragon, Sapphire | Subterranean | Any | Any | MM 73 |
| Dragon, Shadow | Subterranean | Temp/Trop | Any | MM 85 |
| Dragonet, Drake, Cold- | Subterranean | Arctic/Sub-Arctic | Any | DRC 173 |
| Dragonet, Pseudodragon | Subterranean | Temp/SubTrop | Any | MM 91 |
| Dwarf, Daergar | Subterranean | Temp/Trop | Dragonlance | DLMC |
| Dwarf, Derro | Subterranean | Any | Any | MM 96 |
| Dwarf, Derro, Leaders | Subterranean | Any | Any | MM 96 |
| Dwarf, Derro, Savant | Subterranean | Any | Any | MM 96 |
| Dwarf, Derro, Savant, Student | Subterranean | Any | Any | MM 96 |
| Dwarf, Duergar | Subterranean | Any | Any | MM 96 |
| Dwarf, Duergar, Leaders | Subterranean | Any | Any | MM 96 |
| Dwarf, Mountain, Hylar | Subterranean | Temp/Trop | Dragonlance | DLMC |
| Dwarf, Theiwar | Subterranean | Temp/Trop | Dragonlance | DLMC |
| Dwarf, Theiwar, Savant | Subterranean | Temp/Trop | Dragonlance | DLMC |
| Dwarf, Theiwar, Savant, Student | Subterranean | Temp/Trop | Dragonlance | DLMC |
| Dwarf, Undead | Subterranean | Any | Any | MAI |
| Dwarf, Urdunnir | Subterranean | Any | Any | MAIII 36 |
| Dwarf, Zakhar | Subterranean | Temp/Trop | Dragonlance | DLMC |
| Dwarf, Zakhar, Savant | Subterranean | Temp/Trop | Dragonlance | DLMC |
| Elemental, Kin, Earth, Pech | Subterranean | Any | Any | MM 102 |
| Elemental, Kin, Earth, Sandling | Subterranean | Temp/Trop | Any | MM 102 |
| Elf, Drider | Subterranean | Any | Any | MM 112 |
| Elf, Drow | Subterranean | Any | Any | MM 112 |
| Elf, Drow, Leaders | Subterranean | Any | Any | MM 112 |
| Elf, Rockseer | Subterranean | Any | Any | MAIII 40 |
| Eye Killer | Subterranean | Any | Any | FF 35 |
| Eye of Fear & Flame | Subterranean | Any | Any | FF 35 |
| Flareater | Subterranean | Any | Any | MAII 57 |
| Flumph, Common | Subterranean | Any | Any | MAII 58 |
| Flumph, Monastic | Subterranean | Any | Any | MAII 58 |
| Fungus, Ascomoid | Subterranean | Any | Any | MM 120 |
| Fungus, Gas Spore | Subterranean | Any | Any | MM 120 |
| Fungus, Ordinary | Subterranean | Any | Any | MM 120 |
| Fungus, Phycomid | Subterranean | Any | Any | MM 120 |
| Fungus, Shrieker | Subterranean | Any | Any | MM 120 |
| Fungus, Violet | Subterranean | Any | Any | MM 120 |
| Gambado | Subterranean | Temp/SubTrop | Any | MAI |
| Gaund | Subterranean | Tropical | Forgotten Realms | FR2MC |
| Gaund, Frost | Subterranean | Arctic | Forgotten Realms | FR2MC |
| Gaund, Young | Subterranean | Tropical | Forgotten Realms | FR2MC |
| Gelatinous Cube | Subterranean | Any | Any | MM 278 |
| Ghaunadan | Subterranean | Any | Any | MAII 92 |
| Giant, Fomorian | Subterranean | Any | Any | MM 139 |
| Gibberling | Subterranean | Temperate | Any | MM 149 |
| Gnome, Svirfneblin | Subterranean | Any | Any | MM 159 |
| Golem, Brain | Subterranean | Any | Any | MAI |
| Golem, Hammer | Subterranean | Any | Any | MAI |
| Golem, Spiderstone | Subterranean | Any | Any | MAI |
| Greelox | Subterranean | Any | Any | MAI |
| Gremlin, Jermlaine | Subterranean | Any | Any | MM 176 |
| Gremlin, Jermlaine, Elder | Subterranean | Any | Any | MM 176 |
| Gremlin, Mite | Subterranean | Any | Any | MM 174 |
| Gremlin, Snyad | Subterranean | Any | Any | MM 174 |
| Gryph | Subterranean | Any | Any | FF 48 |
| Gulguthhydra | Subterranean | Any | Any | MAII 68 |
| Hook Horror | Subterranean | Any | Any | MM 193 |
| Horgar | Subterranean | Any | Greyhawk | GHMC |
| Hydra | Subterranean | Any | Any | MM 200 |
| Hydra, Lernaean | Subterranean | Any | Any | MM 200 |
| Hydra, Pyrohydra | Subterranean | Any | Any | MM 200 |
| Ibrandlin | Subterranean | Any | Any | MAIII 61 |
| Illithid | Subterranean | Any | Any | MM 251 |
| Illithid, Noble (Ulitharid) | Subterranean | Any | Any | MAI |
| Imorph | Subterranean | Any | Any | FF 52 |
| Impersonator | Subterranean | Any | Ravenloft | RV 33 |
| Inquisitor | Subterranean | Any | Forgotten Realms | FR2MC |
| Intellect Devourer | Subterranean | Any | Any | MM 207 |
| Intellect Devourer, Larva | Subterranean | Any | Any | MM 207 |
| Jelly, Mustard | Subterranean | Any | Any | MM 276 |
| Jelly, Ochre | Subterranean | Any | Any | MM 278 |
| Jelly, Slithering Tracker | Subterranean | Any | Any | MM 280 |
| Jelly, Stun- | Subterranean | Any | Any | MM 276 |
| Jelly, Symbiotic | Subterranean | Any | Any | FFMC |
| Kalin | Subterranean | Any | Any | MAII 75 |
| Kalin Rider | Subterranean | Any | Any | MAII 75 |
| Kampfult | Subterranean | Any | Greyhawk | GHMC |
| Khargra | Subterranean | Any | Any | FFMC |
| Lava Children | Subterranean | Any | Any | FF 61 |
| Lich, Demi-, Drow | Subterranean | Any | Ravenloft | RVIII 72 |
| Lich, Drider | Subterranean | Any | Ravenloft | RVIII 71 |
| Lich, Drow, Priestess | Subterranean | Any | Ravenloft | RVIII 71 |
| Lich, Drow, Wizard | Subterranean | Any | Ravenloft | RVIII 71 |
| Living Steel | Subterranean | Any | Any | MAI |
| Lizard, Subterranean | Subterranean | Any | Any | MM 226 |
| Locust, Giant | Subterranean | Any | Any | DRC 189 |
| Lurker | Subterranean | Any | Any | MM 229 |
| Lurker, Shadow | Subterranean | Any | Any | MAII 80 |
| Magebane | Subterranean | Any | Any | MAI |
| Magman | Subterranean | Any | Any | OMII 82 |
| Mantari | Subterranean | Temp/Trop | Any | FFMC |
| Mantari, Great | Subterranean | Temp/Trop | Any | FFMC |
| Meazel | Subterranean | Any | Any | MAIII 80 |
| Medusa, Maedar | Subterranean | Any | Any | MM 248 |
| Meenlock | Subterranean | Any | Any | MAII 86 |
| Mihstu | Subterranean | Any | Any | OMII 84 |
| Mimic | Subterranean | Any | Any | MM 250 |
| Mimic, Greater | Subterranean | Any | Any | MAII 87 |
| Mimic, Killer | Subterranean | Any | Any | MM 250 |
| Mind Flayer | Subterranean | Any | Any | MM 251 |
| Mite | Subterranean | Any | Greyhawk | GHMC |
| Mold, Brown | Subterranean | Any | Any | MM 255 |
| Mold, Death | Subterranean | Any | Any | MAII 88 |
| Mold, Deep | Subterranean | Any | Any | MAII 88 |
| Mold, Gray | Subterranean | Any | Any | MAII 88 |
| Mold, Russet | Subterranean | Any | Any | MM 255 |
| Mold, Yellow | Subterranean | Any | Any | MM 255 |
| Mold, Yellow (sentient) | Subterranean | Any | Any | MM 255 |
| Mole, Brain | Subterranean | Any | Any | MM 29 |
| Myconid | Subterranean | Any | Any | MM 264 |
| Naga, Spirit | Subterranean | Any | Any | MM 266 |
| Nonafel | Subterranean | Temp/Trop | Any | FF 68 |
| Noran | Subterranean | Any | Any | MAI |
| Ohdowa | Subterranean | Any | Any | LL 27 |
| Ooze, Gray | Subterranean | Any | Any | MM 278 |
| Osquip | Subterranean | Any | Any | MM 300 |
| Otyugh | Subterranean | Any | Any | MM 283 |
| Otyugh, Neo- | Subterranean | Any | Any | MM 283 |
| Piercer | Subterranean | Any | Any | MM 290 |
| Poltergeist | Subterranean | Any | Any | MM 296 |
| Polyp, Giant | Subterranean | Any | Greyhawk | GHMC |
| Pudding, Black | Subterranean | Any | Any | MM 297 |
| Pudding, Dense | Subterranean | Any | Any | MAII 99 |
| Pudding, Grey | Subterranean | Any | Any | MAII 99 |
| Pudding, Stone | Subterranean | Any | Any | MAII 99 |
| Quaggoth | Subterranean | Any | Any | MM 298 |
| Quaggoth, Jald | Subterranean | Any | Any | MM 298 |
| Quaggoth, Thonot | Subterranean | Any | Any | MM 298 |
| Rautym | Subterranean | Any | Any | MAI |
| Revener | Subterranean | Any | Any | DRC 202 |
| Rhagodessa | Subterranean | Any | Any | DRC 202 |
| Rockworm | Subterranean | Any | Any | MAII 20 |
| Roper | Subterranean | Any | Any | MM 304 |
| Rothe | Subterranean | Any | Any | MM 241 |
| Rust Monster | Subterranean | Any | Any | MM 305 |
| Scalamagdrion | Subterranean | Sub-Arctic | Forgotten Realms | MAIII 93 |
| Scorpion, Giant | Subterranean | Temp/Trop | Any | MM 309 |
| Scorpion, Huge | Subterranean | Temp/Trop | Any | MM 309 |
| Scorpion, Large | Subterranean | Temp/Trop | Any | MM 309 |
| Shadow | Subterranean | Any | Any | MM 312 |
| Shadow, Slow | Subterranean | Any | Greyhawk | GHMC |
| Shadowperson | Subterranean | Any | Dragonlance | DLMC |
| Shadowperson, Revered Ancient One | Subterranean | Any | Dragonlance | DLMC |
| Shrew, Giant | Subterranean | Any | Any | DRC 203 |
| Skum | Subterranean | Temp/Trop | Any | MAI |
| Slime, Green | Subterranean | Any | Any | MM 278 |
| Slime, Olive | Subterranean | Any | Any | MM 276 |
| Slime, Olive, Creature | Subterranean | Any | Any | MM 276 |
| Slug, Giant | Subterranean | Any | Any | MM 319 |
| Snail, Flail | Subterranean | Any | Greyhawk | GHMC |
| Snake, Stone | Subterranean | Any | Any | MAI |
| Snyad (Pestie) | Subterranean | Any | Greyhawk | GHMC |
| Spectre | Subterranean | Any | Any | MM 323 |
| Spider, Brain | Subterranean | Sub-Tropical | Any | MAI |
| Sting, Whip- | Subterranean | Any | Any | MAI |
| Stingwing | Subterranean | Any | Any | MAI |
| Storoper | Subterranean | Any | Any | MM 304 |
| Suwyze | Subterranean | Any | Any | MAI |
| Taer | Subterranean | Arctic | Any | MM 241 |
| Tentamort | Subterranean | Any | Greyhawk | GHMC |
| Thessalgorgon | Subterranean | Tropical | Any | MAIII 109 |
| Thessalhydra | Subterranean | Any | Any | MAIII 109 |
| Thessalmera | Subterranean | Any | Any | MAIII 109 |
| Thessaltrice | Subterranean | Any | Any | MAIII 109 |
| Thoul | Subterranean | Any | Any | DRC 209 |
| Tick, Heart | Subterranean | Temp/Trop | Any | MAI |
| Toad, Fire | Subterranean | Temp/Trop | Any | MM 345 |
| Toad, Giant | Subterranean | Temp/Trop | Any | MM 345 |
| Toad, Ice | Subterranean | Arctic | Any | MM 345 |
| Toad, Poisonous | Subterranean | Temp/Trop | Any | MM 345 |
| Tomb Tapper, Thaalud | Subterranean | Any | Any | MAIII 112 |
| Trapper | Subterranean | Any | Any | MM 229 |
| Tren | Subterranean | Any | Forgotten Realms | FR2MC |
| Tren, Chief | Subterranean | Any | Forgotten Realms | FR2MC |
| Tren, Female | Subterranean | Any | Forgotten Realms | FR2MC |
| Tren, Shaman | Subterranean | Any | Forgotten Realms | FR2MC |
| Tren, Sub-Chief | Subterranean | Any | Forgotten Realms | FR2MC |
| Troglodyte | Subterranean | Any | Any | MM 348 |
| Troglodyte, Chieftain | Subterranean | Any | Any | MM 348 |
| Troglodyte, Leader | Subterranean | Any | Any | MM 348 |
| Troglodyte, Subchieftain | Subterranean | Any | Any | MM 348 |
| Umber Hulk | Subterranean | Any | Any | MM 352 |
| Vampire, Drow | Subterranean | Any | Ravenloft | RVIII 107 |
| Vampire, Dwarf | Subterranean | Any | Ravenloft | RV 54 |
| Vampire, Gnome | Subterranean | Any | Ravenloft | RV 58 |
| Vargouille | Subterranean | Any | Planescape | PS 114 |
| Vilstrak | Subterranean | Any | Any | OMII 124 |
| Vision | Subterranean | Any | Any | FF 93 |
| Wall-Walker | Subterranean | Any | Any | MAII 112 |
| Web, Living | Subterranean | Any | Any | MAIII 117 |
| Web, Memory | Subterranean | Any | Any | MAIII 117 |
| Will O' deep | Subterranean | Any | Ravenloft | RVIII 119 |
| Witherstench | Subterranean | Any | Any | FF 95 |
| Worm, Blood-, Giant | Subterranean | Any | Any | MM 364 |
| Worm, Purple | Subterranean | Any | Any | MM 364 |
| Worm, Rock (Thoqqua) | Subterranean | Any | Any | FF 87 |
| Wraith, Soul Beckoner | Subterranean | Any | Greyhawk | GHMC |
| Xaren | Subterranean | Any | Any | MM 367 |
| Xorn | Subterranean | Any | Any | MM 367 |
| Yellow Musk Creeper | Subterranean | Temperate | Any | MM 291 |
| Yellow Musk Zombie | Subterranean | Temperate | Any | MM 291 |