The Celestials, The War of the Righteous!
The Celestials were beings of immense strength who quickly rose to power by relying on the mysterious Supreme Law of Fate. It was an extremely abstruse law that very few beings could master, and yet the Celestials held numerous techniques that could manipulate the Law of Fate as if it was their own two limbs.
Through the fearsome power given by their domination of the Law of Fate, they rapidly expanded their influence across multiple worlds in the Light Expanse, continuing to dominate many forces over the years until it all led to the culmination of a huge war more than one thousand years ago!
This long war was later known as The War of the Righteous, where two sides with their own strong beliefs clashed in large scale combat that colored the stars red and created thousands of dead planets. It occurred over decades as the death toll rose to the billions just for those involved in the war.