A cauldron usually appeared in novels and literature to refer to an instrument or object that could heat or cook food. In many novels, cauldrons were regarded as mysterious objects with great power and magic that could bring good luck and happiness to humans. In wuxia novels, cauldrons were often seen as tools for cooking food. In some fantasy novels, cauldrons were seen as mysterious containers that could contain souls or spiritual objects. In addition, in some novels, cauldrons could also be used as combat tools to heat weapons or defensive equipment. A furnace was a concept that appeared in novels and literature. It represented a mysterious power and a symbol of human civilization.