| Non-terrestrial beings | |
|---|---|
| Extraterrestrial beings | |
| Exotic plants and flora | |
| Interdimensional beings | |
| Interdimensional lifeforms | |
| Exotic metaphysical beings | |
| Underground and underwater beings | |
| Underground civilizations and beings | |
| Underwater beings | |
| Spiritual and philosophical beings | |
| Spiritual entities | |
| Philosophical debates about being | |
| Practitioners/theorists | |
| Related topics | |