Aerial Fortress Eulalia is a dungeon in Wild Arms 4 that follows the White Orphanage and precedes the Wunderweltraum. The level becomes inaccessible and appears nowhere on the world map. Jude and co. fall into a trap set up by Augst Henriksen and Lambda Zellweger of Brionac in their continuing efforts to capture Yulie Ahtreide. This is where the player party battles Scythe Riebaure. The BGM that plays here starts out as Perilous Change (Disc. 1, Track 4) but then switches to Weapon X (Disc 2, Track 4) once the player reaches Area 2, where the cast realizes that they are airborne.