originally posted in:Collective Of Knowledge
Actually, I think that perhaps Eris' rock could be a part, or even what's left, of Taox. It could explain why Eris says it "speaks to her. I also think when Eris says her thing in the cutscene after you beat Oryx, when she says "My Queen" she might be referring to Taox.
English
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Eris is oryx sister sathona the cunning one. The rock is her fathers familiar the worm from the deep that speaks to her. It said in the book of sorrow she is know to hide amongst oryxs enemys. Sword logic dictates she kill him. She used us to kill him so she could take her tribute back as oryx was denying her.