Time Worms could affect the timeline, but this ability was by no means without limits.
The further apart the eras were, the more sharply the power he could project into the past through the Time Worm declined. Especially when he attempted to use a Time Worm to parasitize someone from this era, the power consumed was immense.
Given the current circumstances, according to the limits of his abilities, he could at most successfully parasitize a single Limit Douluo-level powerhouse.
And during the era of the Peerless Tang Sect, there were only a few Limit Douluos in total. After careful weighing and consideration, Nan Fusheng determined that parasitizing the Evil Emperor was undoubtedly the most cost-effective choice.
First, the Evil Emperor became Huo Yuhao's Soul Spirit, which added another layer of assurance to his surveillance of the Great God Realm.
Second, this was essentially only an experimental attempt. Even Nan Fusheng himself could not be certain that he would achieve his goal. In the original course of history, the Evil Emperor had been destined to die anyway.
Since that was the case, it could not be more suitable as the subject of this experiment. Even if the experiment failed, it would not have much impact on his overall plans.
This was the deeper reason why Nan Fusheng had chosen to create these puppets after descending upon the Peerless Tang Sect timeline.
Aside from satisfying his own twisted sense of amusement, the more important reason was that the power he used for Parasitism was heavily suppressed in this era.
However, if he controlled puppets, he could unleash most of his power almost without restraint, allowing him to achieve his goals more effectively.
"Before finding the Evil Emperor, I might as well take a look around this Evil Demon Forest. It is rare