The Head-Swapping Technique was called head-swapping, but it was really body-swapping. Puppet Masters had devised it to address the vulnerability of their bodies in the early stages, and it served as a stopgap before flesh puppetization.
The technique worked along similar lines to the possession arts of the Primordial Spirit Way, but it was far easier to perform. Even someone at Foundation Establishment could accomplish it.
After a head swap, the head remained the primary vessel. Without proper arrangements, the original body would soon rot and deteriorate until it could no longer be used.
Puppet Masters regarded their bodies as lifebound puppets. They did not place excessive importance on them, but neither could they casually abandon them. Their solution was to replace the brain with mechanical constructs and intelligent programs to sustain the body's vitality, then store it somewhere for a rainy day.
This was not only mature technology in this world; it had been possible even on Earth in his previous life, a world without any supernatural powers.
On Earth in his previous life, dignitaries who were already brain-dead but had to be kept alive for various reasons could continue living through the use of ventilators and various treatments, regardless of expense. How much easier would it be for the cultivators of this world?
"The human body in this world differs in structure from that of my previous world, but its main components are still similar, or even identical."
"The brain is merely an organ that maintains thought and consciousness and secretes hormones. People in this world, however, have three souls and seven spirits."
"Brain death is by no means true death. Only when all three souls and seven spirits vanish, when the souls fly away and the spirits scatter, is someone truly dead!"
"There is even a saying: