Shiro Kitsuki

The Last Step Castle is named so because of the steep climb that leads away from the castle to the High House of Light, the gateway to the Dragon mountains. The castle was awarded to Agasha Kitsuki after he was permitted to found the Kitsuki family. Some say there is a secret path leading from the flatlands to Shiro Kitsuki, but if there is it is well hidden. (3E p. 291)