A spirit body was an extremely special existence. They were living creatures before they died, and after they died, they turned into a spirit body, but they also became an existence close to energy.
The process of turning into energy was a stage that King level cultivators had to go through. The meaning behind it wasn't simple, because it was a process of transformation from a lower life form to a higher life form.
A spirit body didn't need to reach the king level to reach this level. Although it wasn't exactly the same and had various flaws, it was very similar in general.
To appear in this form of energy after death, was it unfortunate or lucky?
The reason why living beings would turn into spiritual bodies after death was because of the strong obsession in their hearts. This foreign cultivator was one such example.