100,000 years ago "a great war" of all the races waged on, the destruction it caused resulted in splitting of the world into three pieces, Which were later named as [Heaven's Worlds, Celestial World, Demon World].
"A great being" created the strongest barrier around these three worlds with all the life force of all the great leaders and families and races. To compensate the deaths of the leaders and family members of all the great races, "the great being" sent the remaining members of their families to Celestial World, where Qi and Mana were the highest.
And sent families of the Demon Races or the families or races which started "the great war" which resulted in much destruction and death to the Demon World where the main war happened due which Qi and Mana decreased and demon Qi And demon Mana increased to high level which resulted for inhabitable conditions for most of the races .
And All the remaining families and races were left in Haven's World with moderate conditions for living and cultivation.
It took almost 90,000 years for all the races in the three worlds for building up populations and power to high levels. After then again it lead to small scale great war between Celestial World and Demon World which lead to great numbers of death. Due to this the Leaders of both world came to truce and agreed on competition or war between younger generation where Sage level and above will not participate. This competition or war will be held every 3000 years and will be held in Heaven's World.
After that 3 wars happened in Heaven's world which was later knows as "great wars of Gods And Demons". Due to this after two wars the Leaders of the Heaven's World Created a "Summoning Magic" which summoned people with great potential to became Heroes Or Saints for to fight with God and Demons. With assistance of these Heroes and Saints people of Heaven's World were able to over come the Third Great War, which resulted in great amount of casualties for Gods and Demons. Heroes and Saints sacrificed their life to push back them to their respective worlds.
The Third Great War happened 1000 years ago. From here on our story starts....