If you notice everywhere else in the Books Sathona/Savathûn and Xi Ro/Xivu Arath are referred to as sisters
English
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By whom? Who refers to them as sisters.
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Eachother, both before and much, [i]much[/i] after their acceptance of the Worms
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Which either enforces my theory of gender not being the same as we believe it to be. Or debunks it. They could be referring to gender as we do. Or they could still be referring to gender as power.