Dungeon Background
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Dungeon Backgrounds are used by the game instead of ordinary tilesets to render full background images in boss fights. As such, they are always used on floors that also have a Fixed Room attached, whose layout matches the background's apparent collision. Since boss fights often also have cutscenes, a copy of the dungeon background often also exists as a Map Background.
Dungeon backgrounds are very limited in their dimensions and only have one layer. They can not have animated chunks but they can have animated palettes.