A World Which was Full Of Vitality which was a Heaven for people turned Hell. 

A War Broke out between to 2 Main races. 

God and Demon. 

This was an Era of Immortality where only Strong ruled while weak were just prey.An Era where Immortal Walked on Surface of the Earth.  

God Race and Demon Race have been Enemies for Hundred of Trillions Of Years but They never Broke a All out war because they knew in an all out war both of them will be damaged beyond repair. 

The World Was Divided in 2 Side. 

Elf, Dark Elf, Angels, Valkyrie, Goblins, Fishman and many race sided with God's. 

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Devils, Beast Race, Stone People, Bird Race, And All the Creature of Dark sided with Demons.

An Equilibrium was Maintained until Demon Stealthy Killed 10 Females of God Race For a Ritual. After Investigation God Race Learned that it has been going for Trillion of Years.The Demon Race Kills Few Of God Race Women to Obtain the Divine Power. 

This Enraged the whole God Race which resulted in an All out Battle

The Hundereds of Trillion of Armies From Both side Marched.All the Immortal Took action,the world which was Heaven Suddenly Turned Hell. 

Many People rose And Fell in the War Which went for Trillion Of Years But Few OnlY were capable enough  to Make People Remember their Name.

Only thing which you will See in this world was Slaughter. Females who were captured were turned to Sex Slave or Killed after Torture. Men's were Slashed into 100 of Pieces. No one Cares about Life's because they were both valuable as Weeds which were needed to be Uprooted. 

The Base On Which Those Immortal Reached Immortal was Forsaken for revenge. They Didn't Spare Any Demon or it's Affiliated Race be it a new Born Baby or An Animal. 

And This was only the Starting of The Trillion Year War.