Etterkin resemble hunched, grey-purplish humanoids with distended white underbellies, spider-like faces (fangs and eyes and such), and two sharp, black chitinous claws instead of hands and feet. They are of average intelligence. Etterkin possess the capability to shoot sticky webs and have an affinity for spiders. They are cunning and vicious, and prefer to set traps to ensnare their enemies.
Etterkin are very fond of spiders and other arachnids and often keep them as others keep bees. From time to time, however, an etterkin has a number of monstrous spiders as pets, which are as loyal to it as a dog to a human master.
It has been suggested that etterkin are an aberation of the animalistic Ettercaps.