Immortality was an abstract concept that was often used in novels to describe an immortal state of life. Immortality is impossible in real life, but novels can make up all kinds of ways to make readers curious and yearn for it. In some novels, immortality was usually described as being achieved through cultivation, magic, or special drugs. Cultivation and magic usually required a long period of training and practice, while drugs might have special ingredients and effects. However, these methods had certain risks and uncertainties, and they usually could not meet everyone's needs. In other novels, immortality is described as being achieved through time travel. This method usually required one to find a mysterious time or space and then travel back or return to the past. However, time travel had many uncertainties and risks, and it usually could not satisfy everyone's needs. Immortality is impossible in real life, but novels can make up all kinds of ways to make readers curious and yearn for it. If you want to obtain a complete novel of immortality, you can try to read some fictional novels to understand the methods and plots, or you can find various ways to pursue your goals in reality.