Death Frontier
The fourth disc starts in the Death Frontier but does not stay there. It is a barren wasteland, endless hills of sand. It contains the Wingly city of Ulara.
In the beginning of the fourth disc, Dart and Rose talk and fight out their differences, coming to the conclusion to overcome them. Then the party continues its journey until they find Ulara. Here they are informed by the Wingly Charle all the information they needed, and are sent on their journey with a warm goodbye "party."