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Some time ago, Aura had been startled as he received a message from Kireina. The only woman who had captivated his cold heart for a long time had sent him a message, it seemed that she was ready to depart, and she was going to spend a bit of time preparing before going in.
This meant that of course, he was invited to help her, and he was gladly going to join. As the Supreme God of the Star Ocean, he possessed great power, he had the ability to manipulate space to an extent and also light, his greatest element.
Although it could be said he was more of a mixed bag, the majority of his power was fixated into controlling light, to the point his own light had already evolved into something else, something greater, in fact, the stars themselves were now his light.
Check "The Protagonist's Sister Is Actually the Strongest"!