At the height of the Codominium, a Khuzan clan adapted part of an existing natural cave system for use as a hunting lodge. Each autumn, the Khuzdul would travel there to spend a month hunting; the rest of the time the site sat empty. It has remained hidden for more than a millennium.
This 13 page bestiary article provides general information on demons, divine servants, and other dwellers on Yashain. In addition, details are provided for the 8 types of V'hir and two types of Gytevsha.