While they were revealed as silicon-based repitilian lifeforms based on Alan's research on these creatures, many elements of the physiology of the Creatures of Darkness violate several laws of science: They lack bone, muscle, or vertebrae. Their cells even lack any DNA, but instead contain a crystalline structure with surprising photosensitive properties as the genetic materials that are equivalent with DNA of lifeforms with more organic physiology. This effectively gives an impression that these creatures are more like minerals that imitate the "evolution" of the living and became sentient due to the same reason.