In cultivation novels, a human-made cauldron was usually a cultivation method or cultivation tool. Such furnaces were usually made by a cultivator himself or provided by some powerful immortal cultivators. To make such a furnace, the cultivator needed to have a certain level of strength and skill. He needed to use his own body or other items to make it in order to obtain greater strength and cultivation effects. Human cauldrons were regarded as a very precious cultivation resource in cultivation novels. Only those powerful and experienced immortal cultivators could make and use them.