Etorgidurs are some of the largest creatures in the world, reaching heights of up to 100,000 feet. They are very closely related to the fabled etorgs in origin, but take a more ghostly, ethereal form and largely ignore all other forms of life.

Etorgidurs have a much more social lifestyle; they will often gather in groups of up to 50 to eat, sleep, mate, and bask in the ghostly presence of each other. Because they are nonpermeating beings, they can phase through objects in the world and each other, which is what allows so many large etorgidurs to gather at such concentrated locations.