Cthonic
CR
1+
Traits
Earth Subtype |
Burrow speed should equal creature’s fastest movement speed |
If CR 7 or less with a range equal to the creature's burrow speed |
Blindsight (vibration) (CR 8+) If CR 8 or greater with a range equal to the creature's burrow speed |
Natural melee attacks bypass DR/cold iron |
If the creature is from the Elemental Plane of Earth, it gains the extraplanar subtype when it isn’t on that plane |
Cthonic creatures are native denizens of the Elemental Plane of Earth or underground environments, and they have adapted to exist in dirt and rock.
Source
Alien Archive pg. 150