Inmensos calamares ciegos de cortos tentáculos que viven bajo tierra, siempre excavando, que tienen la capacidad de provocar terremotos.
| ▲Título▼ | ▲C▼ | ▲Año▼ | Autor | △V▼ | ▲Rel.▼ |
|---|---|---|---|---|---|
| After The Big One |    | 1990 | Keith Herber, Lynn Willis, Earl Geier | — | Media |
| Chthonian |   | 1988 | Sandy Petersen | — | Alta |
| Chthonian |   | 1988 | Tom Sullivan | — | Media |
| Chthonien | | 2015 | Loïc Muzy | — | Media |
| Cthonian | | 2004 | James Ryman | — | Media |
| The Cthulhu Mythos |  | 1981 | Sandy Petersen | — | Media |
| Eldritch Horror: Cities in Ruin Expansion |  | 2017 | Dane Beltrami, Tim Uren, Nikki Valens | — | Baja |
Extraños eones  |  ? | 2013 | Emilio Bueso | — | Baja |
| From Beneath | | 2004 | Jesper Ejsing | — | Media |
| The Spawn | | 1989 | Harry Cleaver | — | Alta |
| The Underground Menace | | 1982 | Sandy Petersen | — | Media |
| The City Without a Name | | 1984 | William J. Hamblin | 6.00 | Baja |
| Cement surroundings |  | 1969 | Brian Lumley | 7.00 | Alta |
| Dark Carnival | | 1984 | David A. Hargrave | 7.00 | Alta |
| The Terror from the Depths | | 1976 | Fritz Leiber | 7.00 | Baja |
