Divine lights are the lights that were born the instant the chaos formed. Each thread of divine light contains various amounts of the information about the beginning of everything and the birth of chaos. The divine lights were born with the birth of sky and earth, and is hard to understand but it is also powerful. If the cultivator is not careful, they can turn to ash within the divine light.
There are nine Great Divine Lights and all of them have their wonders. The divine lights have stringent requirements even though we do not know what requirements there are.