The Kirin Caves are, as their name implies, are home to the members of the Kirin tribe. They are located within the Adelphas Mountains. After seraph slave traders wiped out most of the Kirin, the few survivors fled to Loramendi. The caves were left empty, and remain uninhabited to this day.
When Jael and the Dominion begin their invasion of the human world, they provide a common enemy for the Misbegotten and Karou's chimaera rebels to join forces against. The Kirin Caves become a meeting place for the newly formed alliance between rebel chimaera and bastard seraphim.