Quria found out about the worms and sword logic and started worshipping the worms. But later ambushed oryx but realized it couldn't win. It then projected a simulation of Aurash to Oryx and the two had a conversation, quria sent the information back to the vex network. My theory, while it may be a little far fetched is that Taox is Quria who went back In time after getting an understanding of Aurash and Oryx to stop him while he's young and powerless before he meets the worms and gains immense power which ultimately leads to Qurias death. That theory seems pretty crazy I know.