The Overlords' creatures are numerous and vicious predators of several homogenous types. They are reasonably intelligent, being able to strategize and fear risks. This intelligence is particularly evident in the more advanced creations, such as the Myrmidons, which have a simple language. All of the creatures are created using human organs and body parts processed in the Meat Factory, and are heavily specialized for their purpose to the detriment of other attributes. Some creatures use amulet-shaped devices called "mind-calls" which allow for telepathic communication with fellow creatures or Overlords. Most, if not all, of the creature types have weaknesses or aversions exploited by the main characters.