The wyrwulf form can communicate through a series of barks and grunts. When the being was of sufficient age, the wyrwulf form cocoons itself, and then metamorphs into a full-grown adult Codru-Ji. The adults must sleep upright, due to the changes brought about by the formation of their four arms. Special slings were developed to support the slumbering adults. The form of the Codru-Ji communicates in a complex series of high-pitched whistles and sighs, although they were also able to speak in the low-range sounds of most humanoid races.