Seeker Worms are flying horrors of various size and shape. They are invisible to most living creatures, and their origins - if not their existence - are sources of debate. Usually, these parasites measure between one and two feet long, and their body is composed of a bulbous head followed by a tubular body, ending in a perpetually moving tail. Their flesh is covered with dozens of eyes, and several mouths full of fangs. Each of these mouths contains a translucent tentacle terminated by an eye, which unfolds when the teeth open.
Several hypotheses contradict each other about the origin of Seeker Worms, among the few individuals who recognize their existence. One of them affirms that they were originally created by the Great Old Ones to spy on earthly Elder Things, while another version claims the opposite. Also, some others argue that they were made by the Shoggoths to spy on their own masters, the Great Old Ones, in order to rebel against them in time.