This lovely cliff side cave, where very few humans and other creatures can find, is where the Lycans (Werewolves) live in their 'den'. A path that flows from the side of the cliff down to the entrance that has an area to sit and watch the waves or moon is the only way to get in.
Lycans have been known to let a few close allied Vampires visit this sacred place, as Vampires do let them visit their Manor as well.
Lycans and Demons have a truce of sorts which is why a few privileged Demons are allowed to visit their Den, though they are closely watched when they do.