Worm of Time could affect the timeline, but this ability was by no means without limits.
The more distant the era, the more sharply the power he could project into the past through the Worm of Time declined. Especially when he tried to use the Worm of Time to possess someone from this era, the power consumed was enormous.
Under the current circumstances, given the limits of his abilities, he could at most successfully possess a Limit Douluo-level expert.
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There were only a handful of Limit Douluos during the Peerless Tang Sect era. After careful consideration, Nan Fusheng concluded that possessing Evil Emperor was undoubtedly the most cost-effective choice.
For one, once Evil Emperor became Huo Yuhao's Soul Spirit, it would add another layer of assurance to his surveillance of the Great God Circle.
For another, this was essentially just an experimental attempt. Even Nan Fusheng himself could not be certain whether he could achieve his goal. Besides, according to the original course of history, Evil Emperor was doomed to die anyway.
Since that was the case, using him as the subject of this experiment could not have been more suitable. Even if the experiment failed, it would not greatly affect his overall plans.
This was the deeper reason why Nan Fusheng had chosen to create these puppets after descending into 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 possession was heavily suppressed in this era.
However, by controlling puppets, he could unleash most of his power almost without reservation, allowing him to accomplish his goals more effectively.
"Before finding Evil Emperor, I might as well take a look around this Evil Demon