Before time there was one lonely planet B17 ruled by the smartest and most powerful beings in the universe the Prometheans there were three major Primordials.
Shinok
Darkryi
Kidd
All three powerful beings Shinok the leader was a great Primordial he was fair and gave his people what they wanted this is what made the Prometheans great. Darkryi a titan beast massive in size controlled the animals and created the animals that are known today, and the last tragic primordial Kidd the life taker the creator of the angel of death lord of shadows, but none of this matters.
Their were three protectors royal assassins that did Shinoks will if a mortal did not do his worship They were Ciron the god of assassins and his disciples Corvo and Arzores both good at what they did. This is what started the war, with Shinok sending Corvo to his death Arzores took revenge on Shinok with giving Kidd the Blade of Souls the power deadly blade wielded by Shinok it is the only none source of killing a Primordial. Shinok was slayed and Darkryi's soul was put in the blade. With the Primordials gone the world went into darkness and the star giving life to the planet died and collapsed into a black hole consuming the world sending Kidd back into the Netherrealm. And now it comes to the present Shinok and Darkryi are back stronger and ready to reform the master race.