This includes all creatures which dwell primarily underground - from small caves on the surface down to the deepest crevasse of the Underworld. Many of evolved into forms that lack eyes or pigmentation. Such things are not needed in the infinite blackness of the Underworld. Most have developed a heightened sense of touch to detect the slightest vibrations in their stony environment.
| Name | Description |
| A giant variety of spider. | |
| An aggressive carnivorous species of cockroach. | |
| The most common subterranean arachnid. | |
| Creeping Cave Web | A dangerous lurker of the underdark. |
| A wizard's biological experiment gone horribly wrong. | |
| Deathstalker | A winged humanoid that feeds on blood. |
| One ton bipedal humanoid crab. | |
| A parasitic predator with an odd side effect. | |
| Green Slime | An acidic amorphous creature. |
| A large cave fish with a poisonous sting. | |
| Subterranean reptile with a petrification breath weapon. | |
| A monster from the deepest regions of the Underworld. |
This website was last updated April 30, 2025. Copyright 1990-2025 David M. Roomes.