The Fortress of Ashida was the final Samurai fortress in Mini Ninjas. It served as a base of operation for the Samurai Warlord. However, parts of it were significantly damaged by volcanic boulders caused by the overuse of Kuji magic by the time the ninjas were able to sneak inside. After the Samurai Warlord is defeated, it crumbles down and what remains of the fortress is abandoned.
This fortress is built on top of a volcano and is by far the largest and most secure fortress built by the Samurai. However, it had suffered significant damage by volcanic eruptions as a result of the overuse of Kuji magic. The path to the fortress itself is long and through much amounts of terrain, including cliffs, canyons, forests, and mountain sides.