The Sky Fortress is a new biome and structure that generates in the sky on the opposite side of the world as the dungeon, usually above the Jungle. It consists of many different randomly generated floating rooms. Every fortress will have one large altar room at its center where The Divine Light can be summoned. On small and medium worlds there will be 2 treasure rooms which contain 12 Caelite Bars each, to make weapons. On large worlds there will be 4 treasure rooms.
While the player is in the Sky Fortress, the music Heavenly Fortress will play.