The creature palette is a list of all blueprints for creatures available in a module. It is used both in the Toolset when creating a module and in the DM client when a Dungeon Master creates creatures in the middle of a game. Like all palettes, the creature palette is split into "Standard" (listing all blueprints provided by BioWare) and "Custom" (listing all blueprints defined specifically for the module). However, the standard creature palette does omit some special-purpose creature blueprints defined by BioWare (mostly summoned creatures), presumably since those would not usually be of interest to builders or DMs.