Chu Li had previously bided his time in studying the Natural Laws of Qilin. Going through a few pages for two hours every day, he definitely was not in a hurry.
He did the research on formations for the sake of the Autumn Temple.
Coming from the Autumn Temple, petty people often found out about where he came from. Unable to defeat him, they would direct their anger onto the temple instead.
The followers of the Autumn Temple were followers of the dharmic base. They were untrained and would not be able to withstand a single attack from a martial art master.
Chu Li did not want any harm to befall upon the followers of the Autumn Temple, but it was impossible to station a Grandmaster to guard the temple at all times. Formations were the best solution he could come up with.
With the knowledge from his past life intact and the intellect that he had collected in this life, formations would not be a problem if Chu Li could master the Omniscient Mirror.