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Blackmail! Chaos knew very well that the Supreme Deity of Brightness could easily blackmail him with the souls of his parents on the line… So Chaos didn't let her do that to begin with. After all, what was the best thing to do against blackmail than use blackmail back? This is why he used his powers and even managed to break through the supreme domain of both the spirit king and brightness just to infect most of the population of mortals within the planet with a toxic black smoke. If she didn't gave him the souls of his parents, all of her beloved people would die.
