Who would win in a fight and why?
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Honestly they haven't fleshed out either enough to choose. Every scenario I think has more questions. What is Crotas mortality outside of his realm where the sword hurts him? How much foresight does atheon have and how much control of time. The only thing I can really say for certain is atheon wouldn't leave the glass throne so it would have to be Crota invading Venus and the vault of glass.