Back then, Puppet Masters were known as one of the special techniques. Although they were not on the same level as other forbidden techniques, they were also not listed as forbidden techniques.
Some cultivators had even secretly cultivated this technique in order to refine puppets for themselves.
However, most people used dead people to refine puppets in the past. Hence, although everyone knew that this technique was evil, no one came out to stop it.
It was only later on that someone refined a living person into a puppet for their own selfish desires, attracting the attention of the Immortal World. Only then was the Skill of Puppetry included as a forbidden technique.
They even threatened that whoever dared to cultivate this technique in the future would become an enemy of the Immortal World.
From then on, the Skill of Puppetry gradually faded from the eyes of the cultivators.