Ning Cheng was indifferent to other power cultivation techniques, but he found strength-based cultivation techniques very intriguing. These techniques ranked fifth, but the ranking was relative. Just like how the first-ranked weapon could be killed by the second-ranked, and the second by the third.
When strength is pushed to the extreme, killing someone who cultivates the Door of Creation technique is not impossible.
Ning Cheng knew that everyone here was somewhat wary of each other, even between him and Zhong Wuchen, they were just using each other. Even with his weakest cultivation, he wasn't worried about others teaming up against him. As long as there was an opportunity, it was not impossible for him to obtain the strength cultivation technique.
