Underdark Monsters
in Basic Fantasy Role-Playing Game
25 monsters
- Bear, Cave - Monstrous bears even larger than grizzly bears
- Bee, Giant - Giant bees that live in underground hives with a queen
- Beetle, Giant Fire - Huge beetle with glowing red organs that provide illumination
- Beetle, Giant Oil - Giant beetle about 3 feet long with eyes that can see in all directions
- Black Pudding - Amorphous creature that lives only to eat, scouring underground areas for organic matter
- Caecilia, Giant - Carnivorous, legless amphibians that resemble giant earthworms with bony skeletons and sharp teeth
- Cave Locust, Giant - Pale, cricket-like creatures that live underground, 2 to 4 feet long
- Centipede, Giant - Larger versions of normal centipedes, 2 to 3 feet long, fast-moving predatory venomous arthropods
- Crab, Giant - Large crustaceans averaging 5' in diameter, tolerant of various water conditions
- Gelatinous Cube - Nearly transparent cube that travels dungeon corridors absorbing carrion, creatures, and trash
- Giant Bat - Large carnivorous bat with 15-foot wingspan
- Jelly, Black - Amorphous creatures that live only to eat, inhabiting underground areas
- Jelly, Glass - Huge transparent jelly that absorbs carrion and creatures, trapping inorganic material visibly inside its body
- Jelly, Gray - Amorphous creatures that live only to eat, scouring underground areas
- Jelly, Green - Bright green, wet, and sticky jelly that devours flesh and organic materials on contact
- Kobold - Small, dog-faced reptilian humanoids
- Lizard, Giant Tuatara - Large, heavily built predators with powerful shearing bite
- Minotaur - Huge bull-headed humanoid monsters
- Purple Worm - Gigantic subterranean monsters with poisonous stingers
- Rhagodessa, Giant - Spider-scorpion creature with sticky pedipalps for capturing prey
- Rust Monster - Strange monster built like a huge turtle with insectoid head and feather-like antennae
- Shrieker - Large, semi-mobile fungus that wails loudly when approached or threatened
- Skeleton - Mindless undead created to guard tombs or serve their creator
- Spider, Giant Black Widow - Much enlarged version of the ordinary black widow with strong, deadly venom
- Yellow Mold - Poisonous fungus that releases deadly spores when disturbed