It was a law that was often far more difficult to understand than the laws of space, and it was difficult even to find geniuses who could come to an intermediate understanding of that law, in advanced understanding it was almost impossible to find such a person.
This was natural after all the law of time could dominate an entire battlefield even though it was not a law used for fighting, as in the advanced understanding Zhang Yi could win against enemies some levels higher than his cultivation just affecting the enemy reaction with the laws of time.
He could at any time use critical strikes without the enemy being able to react or save his life by avoiding critical strikes from the enemies using the laws of time, and that was just the simplest use of the laws of time that Zhang Yi could use.