It's a story of a long time ago when many celestials beings who created many galaxies and fought for the succession or to conquer the empire of other celestials
And after a million years later . The war was ended because the celestial of dead souls defeated all the other celestials
But now after a million years the celestial of dead souls become weak and uanble to prevent the future wars so that's why he wanted to retire and he is on the way to find a perfect human vessel who is worthy of his almighty powers and being able to command his army