The Great Divide which lead to destruction of the realm of Pangea and eventually caused the creation of three major realms and countless smaller sub-realms.
After the age of Great Divide came the age of Everlasting Nights, the most treacherous time for everyone, countless Kingdoms appeared and disappeared, civilizations rose and fell.
The sudden death of many powerful cultivators caused a power vacuum, many cultivators tried to fill the vacuum but countless failed, and the quality of KI as well as a sudden decrease of treasures caused an age of unrest, turmoil, debauchery and anything unsavory.
During the period of time a type of cultivation gained favor among cultivators which was dubbed as the Path of Devil or the Damned. Those cultivators indulged in debauchery, caused mass genocide, some even became cannibals, and as long as they could become stronger they did not care anything.