I missed that so what? Doesn't make it anymore invalid. Kai is not energy. Ki is, and what is Ki exactly? Life force. Considering it is a living universe, the life force can be used just the same.
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Except for the fact that Destiny uses Light/Darkness as its energy.
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Not everything is light and darkness in destiny. There is plenty of life force
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Maybe, but as SRED did say it probably doesn't exist the same way.