Aerie
In an Epoch long past, the Atav people, who had settled in the mountains of the Vashnars, were faced with slowly dwindling numbers. The young of the Atav approached their elders about mingling with the other races, but were denied. These young ones decided to leave anyway, and for many years, intermarried with other races.
However, they still yearned for the cliff-top homes and passed these stories to their children. As many of the descendents of the true Atav grew into the race we now know as the Atavian, they became concerned that their culture and heritage would be lost amongst so many others, and they departed for the clifftops they descended from.
There, they rebuilt their long abandoned homes, and resettled, keeping their unique culture intact whilst using the mental abilities of their forebears to keep their home hidden from detection. In recent times, these abilities have died out, causing the Aerie to become accessible once more.