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It was once the tyrant of the Netherworld Plane, a man whose soul died gruesomely after being betrayed by all those he once trusted, crushed to death, he died in the most gruesome way possible. A man that had lost everything, and his life… he ended becoming the tyrant of this underworld.
His soul drifted into this world eons ago, and became a lesser specter, an entity without even memories of his own past, a hungry mutated soul that feed on other souls to grow stronger. This was how everybody started in this hellhole, the Netherworld Plane wasn't a place where souls enjoyed a peaceful afterlife nor were reincarnated, it was very similar to hell, but here nobody was given the task to punish the souls for their sins.
Check "The Protagonist's Sister Is Actually the Strongest"!